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Just go with a 6X if six speed is a must. It is a bit closer range but is better suited for the torque of a 6.2 diesel. 2650 RPM at 70 MPH is all I feel comfortable in a 35 year old vehicle. Yes, that is on the high side of torque peak but it's far better than stock in the brake specific fuel...

The transmission and engine work together. Since the 6l80 shifts clutch to clutch without overrunning sprags, engine power is reduced between shifts. The transmission control module requires input from the engine control module AND the TCM requests reduced torque during the handoff. Just a...

6L80 is a totally different beast. Its reliability is from integration of the engine and transmission to work together by reducing torque during shifts. The 4L80 is much tougher because it has to shift under full engine torque. The 6L80 might survive with a stock 6.2 but any mods.. If 6...

Interesting. I'm doing the similar but using a TCI 6X package which has the controller. I have a NIB GM throttle position sensor and a Dakota Digital alternator W term converter for TPS and RPM respectively. I have the Advanced Adapter 0410 for transmission to NP 205. Yes, this is a 7000...