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06 GMC Sierra shifting hard/clunking on acceleration
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Question
DallasEdition
I have a 06 GMC Sierra 1500 crew cab, currently 27,000 miles, 5.3, 4L60-E transmission, tow package,3.23 gears, and locking differential. My problem is when up-shifting from takeoff. When making a casual takeoff from a stoplight, shift point around 1400-1600 rpms, the transmission is smooth like butter. When making a little more spirited takeoff, shift point around 1900-2100 rpms, it feels like its slipping and jerks a little bit when it shifts...almost like it's catching up to slack in the driveline. It sounds like a quick, high pitched clunk, and I cant tell if its coming from the transmission or the differential. Fluid level is good and has a new, pink color on the dipstick. Its not been lifted or modified in any way. From what I can remember, it only does it after its had a chance to warm up.
Im not sure if this is related, but while driving with cruise control on the interstate everything is normal until going down a pretty steep hill. Its as if the transmission keeps pressure built up and wont let it completely coast down the hill, sometimes even bucking a little when going down the hill. Ive had a 10 Charger that would do the same thing and would actually down-shift to keep the same speed, and a 00 Silverado and a 04 Sierra that never did anything like this, so I dont know which one its supposed to do.
I bought this truck in Jan. 14 with only 24,000 miles on it. From what I was told the truck had the miles put on it and then sat for a few years, until I bought it. Sorry for being long winded, but I wanted to give as much useful information as I could possibly think of. Any ideas?
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