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Yeah, I figured that out the hard way. I've never dealt with one that had a seperate TCM.

So I put the factory tune back in and it shifted like it was supposed to. I decided to give it a shot with only writing the gear/tire size changes to the PCM and not the TCM. Everything is as it...

I picked this truck up a few months ago. It has 285's on it from the PO. I'm not trying to do anything tuning wise other than tire size correction and gear ratio change. I initially changed the tire...

I did the Electric fan upgrade on my 03 Suburban 2500 with 6.0 using the factory harness from an '05 Tahoe/Yukon. The fans operate properly to control the coolant temps, it does not turn the fans on...