Quote Originally Posted by THEFERMANATOR View Post
If you have a 01-05 DURAMAX truck with a 5 speed and want to make it a 6 speed, you are pretty well limited to the SUNCOAST kit. The 6 speed valve body will not just drop into a 5 speed and then have a 6 speed OS flashed in(tried this). You have to use the 5 speed style solonoids which means you have to run the kit. And if it is a 01-05 truck, there is no factory or ALLISON flash to enable 6th gear. If you have an 06-07 MD with a 5 speed, then yes it can be flashed to a 6 speed by ALLISON, or if you have a 8.1L you can swap in an 06 TCM, 6 speed valve body, modify the wiring harness, and have a 6 speed.

I have been considering purchase of a 2006 Topkick 4500 4x4 engine decodes as an LLY and guy says trans is a 5 speed you mentioned that 2006 MD can be flashed to enable use as a 6 speed who do I need to contact or what needs to be done to have this update done when or fi the get the truck