2019 GMC Sierra 3500HD 6.6L Turbo Manual Transmission

Bee · May 16

I stumbled on this truck after a friend of mine wrecked it and didn't want to deal with it. I considered tossing everything into a CCLB OBS Ford (7.3 finally died), but am having a hard time finding any information on it. Does anyone know if there's a manual trans that bolts up to it? I read that the trans bellhousing bolt pattern is the same as all other Chevy/GMC V-8's, and that the TH400 or 4L80-E would work. Am I better off keeping the auto because of the transmission input torque limit? Time and skills aren't an issue, just curious if anyone else has played with the idea.

newdude · May 18

On 5/16/2024 at 3:08 PM, Bee said:

I stumbled on this truck after a friend of mine wrecked it and didn't want to deal with it. I considered tossing everything into a CCLB OBS Ford (7.3 finally died), but am having a hard time finding any information on it. Does anyone know if there's a manual trans that bolts up to it? I read that the trans bellhousing bolt pattern is the same as all other Chevy/GMC V-8's, and that the TH400 or 4L80-E would work. Am I better off keeping the auto because of the transmission input torque limit? Time and skills aren't an issue, just curious if anyone else has played with the idea.

GM stopped manual in 2006 with Duramax.