Transmission struggling
I have an older GMC 2500 with more than enough designed towing capacity for my TT but on recent trips, it is up-shifting very hard after 100 miles or so. The most recent was on a return trip to home ...
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It is a 2000 GMC 2500 Sierra with 119k miles. Only had it a year but original owner pulled pretty large Airstream- definitely bigger than our 27 footer
The hard shift is just that, it builds up RPM and then up shifts (not in cruise control) with a bang and jerk to next gear. Again, this is on flat land after quite a bit of down hill.
Engine is 6000 Vortec (364 CID)
4 speed Auto Electronic Trans w/Overdrive w trans cooling system
I had it into the Transmission shop recently and he could not find anything wrong (of course it wasn't towing anything) but he did perform the service.
The hard shift is just that, it builds up RPM and then up shifts (not in cruise control) with a bang and jerk to next gear. Again, this is on flat land after quite a bit of down hill.
Engine is 6000 Vortec (364 CID)
4 speed Auto Electronic Trans w/Overdrive w trans cooling system
I had it into the Transmission shop recently and he could not find anything wrong (of course it wasn't towing anything) but he did perform the service.
