Spend Less, Do More with your Holley Terminator X Max and 6L80 transmission

Complete harness for 6L80 transmission to Holley Terminator X Max

No worthless handheld programmer that is known to be unreliable and doesn't work with all calibrations\transmissions. 

No wasted time on hold for tech support

No stressing about if it will work with your transmission

Detailed instructions included

Harness is 8' from trans connector to ECU connectors. Yes, It's longer than you may need, but couldn't we all use a few extra inches. If you need a longer harness, please contact me. 

Wiring is permanently labeled so you don't have to worry about it in the future. This is idiot proof. I made sure of it.

Connectors are OE brand. Not a cheap knock off. No need to worry about if the connector is seated correctly. 

It is important to note that the EFI screen may not display all of the data for the transmission. This is an issue with the EFI software. Control of the 6L transmission is all done by the TECHM inside. The 6L uses essential data from the EFI controller such as throttle, load, temperatures, and rpm.

This is not a Holley licensed product   

HP Tuners: It's FREE to tune your transmission. Will require HP Tuners or equivalent to tune and calibrate transmission. No license needed. Just the MPV You can adjust so much more and make the 6L80/90 do exactly what you want, when you want. You can't do all that with the "other brand's"  handheld turd.  I recommend HP because I know it works. Other tuners probably work but I have not tested them to be able to recommend.

Why did I build this harness:  I have been a master automotive tech for over 25 years. I pride myself on quality and not wasting time. When installing a GM Performance Supermatic 6L80 in my beloved 4th Gen Camaro, the install was much better that I imagined, until the wiring and programming part. Getting the connector to seat properly in the trans was awful. Then it came time to plug the handheld in and get it ready to drive. After 5 days of tech support, I was told that my transmission calibration does not work with the handheld. How? HP Tuners works like a champ and I have been driving it. Why did I pay for a handheld paperweight? That's when I decided to save others from this headache. Not only would I do it cheaper, I would tell the truth.