OFF ROAD SOLUTIONS FAQ’s

3.4L Conversion FAQ
Coilover Suspension FAQ
Manual Hub Conversion FAQ
22RE EFI Swap FAQ
Other FAQ


3.4L Conversion FAQ

Does it matter if the donor parts are all from the same vehicle?
Yes, we recommend that all donor 3.4L parts are from one vehicle. Toyota made many small changes from model to model and year to year. Matching an ECU, engine harness and related sensors from different vehicles is possible but can be a mess.
What information do you need to place my 3.4L Kit or Harness order?
Donor (3.4L) vehicle: VIN#, Year & Model, 2/4WD, Auto/Manual Trans. If there is any uncertainty about this information, we’ll need to Toyota part #’s to verify, see below.
Recipient (your) vehicle: VIN#, Year & Model, 2/4WD, Auto/Manual Trans, IFS/SAS, Original Engine (what came stock in your truck), Rear-wheel ABS Y/N, and if you will be using stock exhaust manifolds or headers.
Pictures: Here are some applications that we have found to be inconsistent w/ published information. We will need the following pictures for the following applications:
-1989-1990 Recipient Vehicles
There are 2 connectors in the passenger-side “kick-panel”, behind the OEM ECU. One is a white connector and the other is gray. We need a picture of the face of these connectors (opposite the wires).
-1999-2000 Tacoma Donor Vehicles
There will be 2-4 connectors on the engine harness that connect to the 3.4L ECU, they will be toward the inside of the vehicle from the firewall grommet. We need a picture of the face (opposite the wires) of only one of these connectors to see what style is used.

On this model we also need a picture of the large harness-harness connector. This connector is on the engine harness near the ECU connectors. It will be larger than the ECU connectors. It will have a “knob” on each side of the housing. We need a picture of the face of this connector (opposite the wires).

See core information below.
Providing the correct information is the sole responsibility of the customer. ORS will not be responsible for correcting parts due to mis-information.
Without a reliable VIN, how can I tell what year/model my 3.4L is?
On the harness there is a 10-digit part number that starts with "82121-_____". This number is printed on a tag near the firewall grommet.

On the ECU there is a number that starts with either "89661-_____" or "89666-_____".

Your Toyota dealer can identify the model and year using these part numbers. In this case ORS will request these part numbers when placing your order.
Do I need to send in core connectors/harnesses to have an ORS harness built?
Most orders do not require core connectors and most harness are built from all-new parts. However, some connectors have become obsolete and cores are required. The following are applications where core connectors are needed:
1985-1990 22R-E and 3VZ-FE Recipient Vehicles
The cores needed are the harness-harness connectors (2) that connect the original engine harness to the OEM main or “dash” harness. These connectors are located in the passenger-side “kick-panel” area, behind the OEM ECU. These will be yellow, gray or white depending on the year. We only need the connector housings on the ENGINE HARNESS side of this connection.
What parts are needed to complete this swap?
Donor Parts
Conversion Parts
What automatic transmission can I use? Will my 3.0L auto transmission work with the 3.4L engine and computer?
You can use an A340 automatic transmission from a 3.4L or 3.0L application. ORS recommends the 3.4L version for a couple of reasons:

If the donor engine is from a Tacoma, 4Runner or Tundra the 3.0L version will not work flawlessly. The engine computer also operates the automatic transmission. There is a different type of output shaft speed sensor in the newer (3.4L version) transmissions that the ECU will be looking for. Unfortunately the 3.0L sensor is also not easily interchangeable with a newer type. This will create an imperfect shift pattern and a constant engine trouble code (check engine light).

T100 donor engines don’t share this problem. If you plan to use the 3.0L transmission a T100 donor engine will work well and is highly recommended.

Keep in mind that the 3.4L version of the A340 auto transmission was upgraded in performance and strength from the 3.0L version and may be worth the additional cost, see below.

In a 2WD applications transfer case issues don't apply and a 3.4L version of the auto transmission is highly recommended.
Will my transfer case work with a 3.4L version automatic or manual transmission?
No, and neither will the 3.4L transfer case.* You will need a gear-driven transfer case from a 1979-1995, 4-cylinder, manual transmission Truck or 1984-1993, 4-cylinder, manual transmission 4Runner. The transfer case must to be converted to or equipped with a 23-spline input shaft and top-shifting configuration. You will also need a Marlin Crawler transmission x transfer case adapter (available from ORS) for installation of this transfer case. Some of our A/T conversion kits are equipped with this adapter.

This transfer case is needed to correct the front driveshaft output. On Tacomas, 4Runners, and Tundras the front driveshaft output is on the driver side. On your vehicle it outputs on the passenger side.

*Unless you have a T-100 donor vehicle. If the donor 3.4L parts and transmission are from a T-100, the T100 front driveshaft output is on the passenger side (like yours). In this case the T100 transmission and transfer case would work without modification.

An Atlas transfer case can also be used behind some 3.4L transmissions. Advanced Adapters manufactures an adapter to make this happen. This would be ideal for hard-core applications that may require the additional strength.
What manual transmissions can I use?
You can use an R150 (found behind the 3.0L & 3.4L) or an R151 (22R-TE turbo applications) transmission. If the R150 is from a 3.0L it is a direct bolt-in to the 3.4L engine and also to the 3.0L chassis.

If you have an ‘84-‘95 4-cylinder chassis you can use this transmission with its original cross-member and drive-shafts (same wheelbase) to make this portion a “bolt-in”. From there, the ORS motor mounts can be used to mount the engine easily.

If the R150 is from a 3.4L you will need to refer to the transfer-case issues above if your vehicle is a 4WD. Also note that the 3.4L version of the R150 will not work with the ORS Exhaust Crossover Pipe.

The 3.0L and 3.4L version of the R150 have different input shaft lengths and must be used with their original bell-housings.

If you use an R151, you will need to use a bell-housing from a 3.0L.
What clutch should I use?
If using 3.0L version of the R150 or the R151, we recommend the use of a 3.4L flywheel, clutch cover, clutch disc, and pilot bearing. With that, a 3.0L release bearing will be required.

Using all the 3.0L flywheel and clutch components is possible, but the 3.4L flywheel/clutch was upgraded in diameter for the increased power and should be used.

If using the 3.4L version of the R150, you will need the flywheel and all clutch components from a 3.4L application.
What radiator should I use?
We’ve found that 90-95 3.0L radiators work the best with Trucks and 4Runners in this swap. We’ve found this radiator to work well, even in the Arizona summer with the A/C on. This radiator is also a direct bolt-in to most Trucks/4Runners.

If using this radiator we also recommend the use of the 3.0L fan shroud.
What is the average install time?
Install times will vary greatly depending on the amount of detail put into the install. Well-executed swaps normally take 50-100 hours depending on the transmission setup, exhaust, accessories, installer’s learning curve, and the recipient vehicle.
What would it cost to have ORS perform the swap for me?
Average Costs, however prices may differ depending on your individual swap.
Do I need the dipstick drill guide?
Only 2000 and newer 3.4L models require drilling. 1999 and older models already have the necessary hole in the block.
What are your crossovers made of?
They are made from mild steel. We recommend a ceramic coat finish before installing the ORS crossover.
Can you install the crossover with the motor in the vehicle?
You can, however it is much more difficult this way. At a minimum you will have to remove the transmission crossmember and drop the transmission a ways to get the crossover pipe in or out of the vehicle.
What do you recommend using for the exhaust?
There is no easy solution for the exhaust system, it must be custom-built; whether you use a crossover pipe or headers. We recommend using at least 2.5" diameter exhaust tubing and components for best performance. We also recommend using a flex pipe in your exhaust system after the headers or crossover to prevent premature failure of these components. MORE INFO HERE.
What should I do for my emissions?
If you have emissions testing where you live, check your local laws first. There is normally a legal way to do a swap.

This will involve some paperwork. Be sure to keep all information you have about the donor vehicle, especially the VIN.

Normally you will be required to use the emissions systems from the donor vehicle. This is possible with the ORS harness and the 3.4L emissions components.

NOTE: ’02 and newer 3.4L vehicles have a more complicated EVAP system. It is possible to work with this system, but in strict emission-law areas it can be difficult to use.
Can my vehicle be switched from an A/T to a M/T during the swap?
Yes, this is actually done pretty often. First of all, you will need to notify ORS of the transition when ordering a kit/harness. We will change the parts accordingly.

You will also need to install a clutch pedal, bracket, and hydraulic system into your vehicle. We suggest using these parts from a M/T donor vehicle of the same model/year, this will make the swap relatively simple. The floor will also have to be modified to accept the new shifter locations.

If a “Clutch Start Cancel” switch is desired this will have to be hard wired into your vehicle’s start circuit.
Can my vehicle be switched from a M/T to an A/T during the swap?
Yes, this is actually done pretty often. First of all, you will need to notify ORS of the transition when ordering a kit/harness. We will change your parts accordingly and add the necessary circuits to your wiring harness.

You will also need to modify your floor to fit the new A/T shifter. You may also want to change your pedal and bracket assembly to match that of an A/T vehicle.

The clutch start cancel switch will have to be bypassed in order for the start circuit to work.
Will my stock EFI fuel pump work with this swap?
Normally the OEM 22R-E or 3VZ-FE fuel pump is sufficient for the 3.4L. If the 3.4L is supercharged, however, we recommend an upgraded fuel pump. We recommend an upgraded pump from URD, www.urdusa.com. If the upgraded pump is outside your budget you can normally retro-fit a 3.4L OEM pump into your stock pump location.
How many oxygen sensors will I need to install with this swap?
You will need 2 oxygen sensors. All 3.4L engines use the OBD2 emissions standards. These standards require the use of 2 oxygen sensors. One sensor is installed before the catalytic converter and one is installed after the catalytic converter. This setup allows the ECU to monitor the efficiency of the catalytic converter(s). For this reason you will also have to install one or 2 functioning catalytic converters.

If the oxygen sensors or catalytic converter(s) are not functioning properly the ECU will detect this condition and the engine will run poorly.

*See the tech article for more info on oxygen sensor types and exhaust setup.



Coilover Suspension FAQ

What are some benefits of doing a coilover vs. leaf-sprung swap?
  • Superior vehicle control, even at a crawl
  • Front axle wrap eliminated
  • Fine tuning ability
  • Front axle moves forward during compression for better tire to firewall clearance
  • Superior strength by design and components
  • Improved ride characteristics
  • Increased wheel travel in most cases

What sets the ORS Coilover kits apart from the competition?
  • We use the longest control arms on the market, our lower control arms are 37-41” long (center-center). This provides improved geometry.
  • Our kits are based around 14" travel or longer coilover shocks. These shocks are longer than the competition is set up for. We also offer superior shocks in our kits – Fox Racing Shocks.
  • Stronger control arms. Our lower control arms constructed of 2.25"x .375wall DOM tube with 1.25" Heim Joints or 2.5" Johnny Joints on one end and 2" oversized polyurethane bushings on the other.
  • Bump-stops and limit straps are not only offered but included in all kits. This keeps the suspension under control and protects those expensive components.
  • The strongest bracket attachment available. All frame brackets are plated or sleeved at their mounting points and designed to contact at least 2 different surfaces of the frame.
  • High quality brake plumbing kits are available.

What should I use for my rear suspension?
We have used our front suspension systems with a combination of rear suspension setups. We recommend the ORS rear 4-link kit for maximum off road performance.

A leaf spring setup also works well in the rear. Quality leaf springs used with extended spring shackles and long-travel shock mounts will offer similar travel to the front coilover suspension.
How much lift will the coilover kit give me?
Our coilover systems are designed for 5-8” of suspension lift over stock height. This does not include the height gained from larger tires or body lift. This height is adjustable by the spring adjusters and/or changing the coil springs.
What axle should I use for my Tacoma?
Our Tacoma front kit is designed around the Diamond Axle. This is one of the few axle housings that can take the abuse that our coilover suspension system is capable of dishing out. Other axles can sometimes be adapted to fit our system. More information about axles can be found here: Coilover Axle Info
Can I still drive my truck on the street after installing the ORS coilover kit?
First of all, check your local laws. In some places a “heavily modified” suspension of this nature is illegal for street use. These kits were designed for off-road use only and we cannot guarantee street performance or safety. The use of an ORS Coilover Kit on the street is the sole responsibility of the driver.

All that aside, we do have several customers who operate these systems on the street. They are characteristic of a soft suspension. They are sensitive to tire type and balance. These systems are also sensitive to loose or worn components. We have found that well-installed, well-maintained systems with balanced radial tires drive very well on the street.
What is the average install time for the coilover kits?
Install times will vary greatly depending on the amount of detail put into the install. Well-executed swaps normally take 40-60 hours depending on the axle setup, steering setup, vehicle condition, accessories, and the installer’s learning curve.
How difficult is the install of the ORS coilover kits?
The difficulty of the ORS Coilover Kit install closely parallels that of a leaf-spring SAS. Although our kits simplify the process greatly it still can be a difficult swap for some. We recommend professional installation if the installer’s experience or skill is not sufficient.

Welding, grinding, cutting and precise measuring equipment and skills are necessary. We recommend that only a MIG or TIG welder using at least 220V be used. We also recommend that the installer is knowledgeable with basic suspension/steering principles.

Remember that this system is only as good as the installation. The installer accepts sole responsibility for the function of this system.
What would it cost to have ORS perform the swap on my Tacoma?
If we provide you with a fully built Diamond Axle (8" Front, High Pinion, ARB, Longfield 30spline axle kit), our full coilover system with Heim joints, Shock Hoop Brace, Steering Stabilizer, Steering Gear, Steering Shaft Components, T-Case Crossmember, P/S Hose, Custom Front Driveshaft, Oil Pan Conversion, Front Brake System and all the labor and supplies, you would be looking at a total price of $15,500. This price would vary depending on all the extra options you included or “dis-included”.
What type of tubing do you use in your kit?
We only use carbon-steel DOM tubing throughout the kit.



Manual Hub Conversion FAQ

Why is ORS’s kit better than the competition?
Our competition does not include new wheel bearings in their manual hub conversion kits. Contrary to what is said, these bearings are NOT re-useable and must be replaced for safety when doing this swap. Our kits also come with the large snap rings that retain the wheel bearings, which are often destroyed during the swap.

Our kits also come standard with replacement axle shafts. In some cases these shafts are required, in others they are just nice to have. When separating the OEM axle shaft from the OEM outer CV joint, the OEM retainer spring-clip will often “seize” in place. This requires an enormous amount of force to separate the 2 pieces. This force often strips the splines from the end of the axle shaft. We offer replacements in our kits to avoid this hassle.

We are also the originators of the Manual Hub Conversion Kit on these models. This means we have more experience than anyone at providing this quality kit.
Why can’t I just get used hubs from a junkyard like I can on older models?
The hub/bearing setup is an entirely new design on the ADD vehicles. The hub and axle are splined together and cannot spin independently of each other. For this reason the axle and the hub are changed.
Why don’t you have inner joints for my Tacoma with long travel?
The inner joints required for long-travel systems are from a ‘99-‘06 Tundra. These were a unique joint not used in other applications. Due to low demand these joints were not built in the aftermarket and can only be found used or new through Toyota.
Will my MPG average increase?
In our opinion gas mileage is not a big reason for doing this swap. You may see a 1-2 MPG improvement.

The real reason for the design of this kit was to save you wear and tear on the CV axles/boots/etc. Our kit allows these important components to no longer spin when you drive in 2wd, saving A LOT of daily mileage on them, and extending their lifetime. Another benefit of the kit is that if you were to break something on trail, you can disengage that axle and drive away safely (in most cases) without breaking it further or getting completely stranded on trail. This means you can get home and fix the issue in the convenience of your garage vs. being on trail doing a mandatory fix.
Is ORS going to make a manual hub kit for the newer vehicles?
Right now we do not have a kit for the newer vehicles. We are not working on a kit for them currently either. We will be looking into the possibility of building them in the somewhat near future. If we make a kit, we will update our website with them immediately along with sending out an e-mail to our mailing list.
Do the high angle boots fit the newer models?
We have not tried them on the newer vehicles and cannot guarantee fitment.

22RE EFI Swap FAQ

What parts are required in addition to the ORS harness to complete an EFI swap?
A required parts list in included with our instructions:
85-88 P/U & 85-89 4Runner EFI
89-95 P/U & 90-95 4Runner EFI
What information is needed to order an ORS EFI Conversion Harness?
Donor (22R-E) vehicle: VIN#, Year & Model, 2/4WD, Auto/Manual Trans. If there is any uncertainty about this information, we’ll need to Toyota part #’s to verify, see below.
Recipient (your) vehicle: Year & Model, Auto/Manual Trans, Original Engine (what came stock in your truck), and battery/fuel pump location if not similar to stock.
Pictures: Here are some applications that we have found to be inconsistent w/ published information. We will need the following pictures for the following applications:
-1989-1990 Donor Vehicles
There are 2 connectors in the passenger-side “kick-panel”, behind the OEM ECU. One is a white connector and the other is gray. We need a picture of the face of these connectors (opposite the wires).
See core information below.
Providing the correct information is the sole responsibility of the customer. ORS will not be responsible for correcting parts due to mis-information.
Without a reliable VIN, how can I tell what year/model my 22R-E is?
On the harness there is a 10-digit part number that starts with "82121-_____". This number is printed on a tag near the firewall grommet.

On the ECU there is a number that starts with either "89661-_____" or "89666-_____".

Your Toyota dealer can identify the model and year using these part numbers. In this case ORS will request these part numbers when placing your order.
Do I need to send in core connectors/harnesses to have an ORS harness built?
Many orders do not require core connectors and many harness are built from all-new parts. However, some connectors have become obsolete and cores are required. The following are applications where core connectors are needed:
1985-1988 Pickup, 1985-1989 4Runner: Core Connector Document
1989-1990 Pickup, 1990 4Runner Donor vehicles: The cores needed are the harness-harness connectors (2) that connect the original engine harness to the OEM main or “dash” harness. These connectors are located in the passenger-side “kick-panel” area, behind the OEM ECU. These will be yellow, gray or white depending on the year. We only need the connector housings on the MAIN OR “DASH” HARNESS side of this connection.
Does it matter if the donor parts are all from the same vehicle?
Yes, we recommend that all donor 22R-E parts are from one vehicle. Toyota made small changes from model to model and year to year. Matching an ECU, engine harness and related sensors from different vehicles is possible but can be a mess.
What should I do for my emissions?
If you have emissions testing where you live, check your local laws first. There is normally a legal way to do a swap.

This may involve some paperwork. Be sure to keep all information you have about the donor vehicle, especially the VIN.

Normally you will be required to use the emissions systems from the donor vehicle. This is possible with the ORS harness and the 22R-E emissions components.
Can I use an automatic transmission with this swap and the ORS harness?
Our harnesses are designed around manual transmission applications. However, in most cases an A/T can be used. Please inquire w/ ORS.



Other FAQ

Why is DOM tubing better than HREW tubing?
DOM (Drawn Over Mandrel) tubing is better because it is one solid piece, there are no seams or weak points in the tubing itself. HREW (Hot Rolled Electric Welded) is a flat piece of steel that is rolled and then welded to make a tube. DOM construction normally provides a 30-40% strength increase as a structure. DOM tubing also offers precise and consistent inner and outer diameters.

All fabrication and parts construction at ORS is performed with DOM tubing.