2003 GMC Sierra Denali - 6.0L, 4L65E
I just picked up this truck a few months ago and haven't really needed to do any towing with it to this point. My family goes to Super Chevy Weekend in Reading, PA every year. Recently the tranny in my dad's HD started slipping in second so I towed his 30' camper for him. Needless to say, its a pretty heavy unit and was a pretty good test on a couple of the mountains.
My only complaint really is that there was a lot of gear searching from 4thu to 3rdthe when driving on relatively flat ground. Also just looking for it to shift and drive better all around.
I made some adjustments to the trans tune for both regular driving and towing and would like some input/advice before I tow the trailer back on Monday. My trans is stock except for a corvette servo and a super hold 4th apply piston and cover. That being said, the second gear shift is still slow most of the time even with the modified tune and corvette servo.
Any suggestions or adjustments to the tune would be greatly appreciated.