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**Bob B.** · 02-22-2021, 01:27 AM

Transmission control modules on the 6L80 and 6L90 and mounted on the valve body, and have to be programed to the truck. Dealers and some of the better independants shops can do this. I suspect the wild quotes you got are from shops that know they can't handle these transmissions so they sub them out to the nearest dealer and pad the bill. Or they just don't want the job. The fleet I work for has had very good luck with the 6L90.

02-22-2021, 01:27 AM	#8
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,306	Re: 6l90e no reverse Transmission control modules on the 6L80 and 6L90 and mounted on the valve body, and have to be programed to the truck. Dealers and some of the better independants shops can do this. I suspect the wild quotes you got are from shops that know they can't handle these transmissions so they sub them out to the nearest dealer and pad the bill. Or they just don't want the job. The fleet I work for has had very good luck with the 6L90. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.