Just working to perfect everything. Once the products leaves I never want to see it again.
6 Speed Manual Transmission Swap Guide and Harness Info.
There has been much confusion with swapping a 6 speed manual transmission into a 6th gen V6 Accord. I thought I would write this post to allow people to easily understand how the process works without unnecessary reposting of this topic over and over again. As well as filling my PM box with one sentence messages asking "How do a swap a 6 speed in my car?"
The Module
Overview
The swap module allows for the interfacing of the 6 speed manual transmission with the stock Accord 4 speed automatic transmission computer.
Without the module the following feature will not work.
-VTEC
-Full rev limit
-Speedo
-Reverse lock out
-Reverse light
-Passing inspection due to CEL
Parts list
The parts used for this swap are quite simple everything is available from Honda except the harness. Try to get as many parts off the donor car as possible. Here are some diagrams of the parts needed.
You can purchase parts and view detailed diagrams at Honda parts sites such as www.hondaautomotiveparts.com and www.acuraautomotiveparts.org. I find these are great sites for diagrams which allow you to see what is involved in a swap.
Mounts
The only mounts that are required to be change are the transmission mounts. The rear engine mounts can also be changed with a CL-S mount which is stronger but is not required. For the transmission mounts use the ones from the 03 CL-S 6 speed.
Axles and Intermediate shaft
The stock axles and intermediate shaft work just fine with the 6 speed transmissions. The CL-S axles are suppose to be stronger and thicker.
Pedals
You can use either the 03 CL-S or I4 Accord pedals.
Clutch hydraulics
You can use the clutch lines from the CL-S as well as the master cylinder. I have tried using a master cylinder from a mid 90's Civic as well and it works just fine and is a good bit cheaper.
Clutch Disc, Pressure Plate and Flywheel
You can use the clutch disc, pressure plate and flywheel from any 6 speed transmission. The Accord, TL and CL all use the same clutch but the CL uses a different flywheel which doesn't matter with this harness.
Shifter and Linkages
The I4 Accord shifter and linkages are not a direct fit and will have to be modified. The only linkages and shifter that are a direct fit are the from the 03 CL-S.
Starter
The automatic starter will not bolt up to the 6MT transmission you will be one from any 6MT car.
03 CL-S 6MT
03-07 Accord 6MT
6 Speed Transmissions
6 Speed transmissions from the following cars can be used. But the Accord and TL transmissions will have to be modified slightly by welding on a stud for the shift linkage. (more on this later)
03-07 Accord V6 MT (NO LSD)
03 CL-S MT (LSD)
04-08 TL MT (LSD)
Special Preparations
Before installing the harness the mechanical aspects and stock wiring should be checked for functionality. This can done be driving the car in limp mode, by removing the transmission range switch from the automatic transmission and connecting it to the engine harness. Then by manipulating the the switch to the N or P position using a screw driver. Test to see if the car will drive. This will eliminate difficult troubleshooting due to the possibility of problems with both the car and harness.
Common Questions
Q: What car will this harness work on.
A: 98-02 Accord V6
Q: Will the harness work with a TL or CL.
A: Not yet we are working on the Type-S ECU currently. The harness might work on the 99 TL and will soon be tested.
Q: Can I use a I4 or Prelude transmission.
A: No only the listed transmission will work.
Q: Can I use this harness with the J32A2 Type-S ecu.
A: No, we are currently working on a harness that works with a Type-S motor. We hope this can be applied to the Accord, TL and CL.
Q: How can I get a harness.
A: The design has been modified for a easy install and will be mass produced soon. The first ones should be ready in around April.
Success Stories
Please let me know of any corrections.
Richie V6
99 Accord J30A1 with TL 6 Speed
99 Accord ECU
Capnff
00 Accord J32A1 with Accord 6 Speed
00 Accord ECU
MikeyMike
99 Accord J30A1 with CL 6 Speed
99 Accord ECU
JDMGRNAV6
99 Accord J30A1 with Accord 6 Speed
99 Accord ECU
Cmann87
99 Accord J30A1 with Accord 6 Speed
99 Accord ECU
2nd Gen Harness
![]()
The Module
Overview
The swap module allows for the interfacing of the 6 speed manual transmission with the stock Accord 4 speed automatic transmission computer.
Without the module the following feature will not work.
-VTEC
-Full rev limit
-Speedo
-Reverse lock out
-Reverse light
-Passing inspection due to CEL
Parts list
The parts used for this swap are quite simple everything is available from Honda except the harness. Try to get as many parts off the donor car as possible. Here are some diagrams of the parts needed.
You can purchase parts and view detailed diagrams at Honda parts sites such as www.hondaautomotiveparts.com and www.acuraautomotiveparts.org. I find these are great sites for diagrams which allow you to see what is involved in a swap.
Mounts
The only mounts that are required to be change are the transmission mounts. The rear engine mounts can also be changed with a CL-S mount which is stronger but is not required. For the transmission mounts use the ones from the 03 CL-S 6 speed.
Axles and Intermediate shaft
The stock axles and intermediate shaft work just fine with the 6 speed transmissions. The CL-S axles are suppose to be stronger and thicker.
Pedals
You can use either the 03 CL-S or I4 Accord pedals.
Clutch hydraulics
You can use the clutch lines from the CL-S as well as the master cylinder. I have tried using a master cylinder from a mid 90's Civic as well and it works just fine and is a good bit cheaper.
Clutch Disc, Pressure Plate and Flywheel
You can use the clutch disc, pressure plate and flywheel from any 6 speed transmission. The Accord, TL and CL all use the same clutch but the CL uses a different flywheel which doesn't matter with this harness.
Shifter and Linkages
The I4 Accord shifter and linkages are not a direct fit and will have to be modified. The only linkages and shifter that are a direct fit are the from the 03 CL-S.
Starter
The automatic starter will not bolt up to the 6MT transmission you will be one from any 6MT car.
03 CL-S 6MT
03-07 Accord 6MT
6 Speed Transmissions
6 Speed transmissions from the following cars can be used. But the Accord and TL transmissions will have to be modified slightly by welding on a stud for the shift linkage. (more on this later)
03-07 Accord V6 MT (NO LSD)
03 CL-S MT (LSD)
04-08 TL MT (LSD)
Special Preparations
Before installing the harness the mechanical aspects and stock wiring should be checked for functionality. This can done be driving the car in limp mode, by removing the transmission range switch from the automatic transmission and connecting it to the engine harness. Then by manipulating the the switch to the N or P position using a screw driver. Test to see if the car will drive. This will eliminate difficult troubleshooting due to the possibility of problems with both the car and harness.
Common Questions
Q: What car will this harness work on.
A: 98-02 Accord V6
Q: Will the harness work with a TL or CL.
A: Not yet we are working on the Type-S ECU currently. The harness might work on the 99 TL and will soon be tested.
Q: Can I use a I4 or Prelude transmission.
A: No only the listed transmission will work.
Q: Can I use this harness with the J32A2 Type-S ecu.
A: No, we are currently working on a harness that works with a Type-S motor. We hope this can be applied to the Accord, TL and CL.
Q: How can I get a harness.
A: The design has been modified for a easy install and will be mass produced soon. The first ones should be ready in around April.
Success Stories
Please let me know of any corrections.
Richie V6
99 Accord J30A1 with TL 6 Speed
99 Accord ECU
Capnff
00 Accord J32A1 with Accord 6 Speed
00 Accord ECU
MikeyMike
99 Accord J30A1 with CL 6 Speed
99 Accord ECU
JDMGRNAV6
99 Accord J30A1 with Accord 6 Speed
99 Accord ECU
Cmann87
99 Accord J30A1 with Accord 6 Speed
99 Accord ECU
2nd Gen Harness
61 - 80 of 116 Posts
61 - 80 of 116 Posts
