- - 8 Speed trans
(https://www.performancetrucks.net/forums/gmt-k2xx-trucks-general-discussion-221/8-speed-trans-552010/)
Mileguru
04-05-2019 12:28 PM
Originally Posted by Moddoo
(Post 5460408)
Is this true for the 6 speeds? or just the 8-10?
It's for the 8-speeds (and maybe the 10, but I don't know). The 6-speeds are all accessible and ready to tune. There are two options to tune the 2017+ 8-speeds: 1) Send the TCM to HPT and have it unlocked for $200, or 2) Buy a new unlocked TCM mated to your truck for $400 from HPT.
