Question-------------------------
Followup To
Question -
My question concerns hard 1st to 2nd shifting. I own a 2000 GMC Sierra 2500. The truck has 107k miles and has been well maintained. After any freeway driving I will experience hard shifts (especially from 1st to 2nd). The hard shifting will go away if I shut the truck off and then restart it. This hard shifting only happens after freeway driving, otherwise the truck shifts smoothly. I have heard several theories concerning this phenomenon. Thanks for your time.
Answer -
THEORIES and GUESSES I can give you, EXACT cause will require driving and testing.
Some possibilities are: (depending upon TYPE of transmission)
1. Intermittent sticking of the 1-2 shift valve.
2. intermittent operation of the 1-2 shift solenoid.
3. Intermittent fault in the shift control module.
When was the last time you had the trans fluid changed ?.
autohelp
I just had the fluid changed.
J
AnswerOK, But you did NOT tell me that in your initial question, So I had to ask.
You are at the point that requires professional testing of the various components that I mentioned earlier.
Without actually driving the vehicle myself, An exact cause is most impossible, GUESSES, I can give you all day long if you want to start replacing parts in HOPES of getting lucky.
I wish I could tell you EXACTLY what component is at fault but since I have no access to the vehicle, I can only advise you to have a trans shop or your loacl dealer perform the road test.
autohelp
