Gm Stutter

[orviskid]

My 2001 sierra sle has a stutter going from 1st to 2nd. thats about the best i can explain it. it makes a stutter when it shifts, its not smooth. its not real bad but is noticeable. i had it in at the dealer and they found nothing. unless the truck doesn't move at all i don't think they want to deal with trannys. i was thinking maybe the shift solenoid or shift pack. the truck runs good otherwise thats why i never really pursued it any further. its not 4 wheel drive and it has 106K on it and its been doing it since probably 50k miles. noticeable in the hot or cold, i do have the tranny cooler on my truck, i do tow a boat but it is very small and light. the tranny has had the basic service done more than once.

[KB06YUKONXL]

Check the trans fluid first. If it is dark brown or smells "burnt" you have gone too long without fluid replacement and your trans is probably on it's way out. If not, first try draining the pan and replacing the fluid and filter. You may be getting a shudder because the additives in the fluid are depleted. If the fluid is burnt I would not get a complete flush of the trans but do a drain and refill to more slowly add new fluid into the system. If you are lucky, this may be your issue. If not you probably havd a clutch or torque converter issue. I have brought 2 4L60's "back to life" by doing the pan drop and new fluid and then every oil change swap out 2-3 quarts of fluid out of the dipstick tube with a fluid extractor (see motive.com) until I have 80%+ new fluid in the system.

 

It's worth a try versus $2,500 for a new trans. Note: If this is a viable solution, you will notice a difference shortly after the initial pan drop fluid replacement. Some guys also use a product called Auto-rx to clean the trans as well but I have never tried it. Good luck.

[orviskid]

all thats been done by the dealer twice now. its been going so long if the tranny was toast, it would have failed by now. its in the shifters of something along that line. to have the fluid done twice by 106k, the tranny should work fine. most people never have that done once over the life of their car. there is also some slipping, but it happens so infrequently, like maybe once a year, i don't worry about it. i'll stop at a light and then press the gas and the truck just sits there for a second or two. i notice that when i hit a red light and it changes just as i get up to it so im slowing down and then stepping on the gas to go again without ever really stopping. it sounds like alot, but its been going on for years and the tranny hasn't went yet and the dealer finds nothing. they just offer the tranny service, thats it.