GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 2 of 2
  1. #1

    Default '99 Tahoe Rough Shift

    I've got a '99 Tahoe 5.7 with 108,000. I've started noticing that after driving for a while, (10-15 miles), at highway speed the transmission shifts really hard from 1st-2nd and 2nd-3rd until I shut it off for a bit and start off again, then it shifts just fine. No other problems. I checked the fluid and it's full and appears to be fine. (reddish color with no burnt smell) Any ideas? No check engine or service engine lights either. I'm stumped. I've put about 20000 miles on the truck since I bought it and I know it was serviced regularly. I do a little towing with it but only an aluminum boat and trailer. (about 1500 lbs.)

  2. #2


    Sounds like a bad TCC apply valve. Do you have the SES light on? See if you have a P1870 (Trans Component Slipping) DTC. Sonnax has a replacement valve, spring and orings to cure the issue. Also cures sloppy TCC lockup. I'm guessing you have the 4L60E transmission.

Similar Threads

  1. 2000 Tahoe Vortec 5.7L, rough idle
    By J3. in forum GM Powertrain
    Replies: 15
    Last: 06-29-2009, 02:27 PM
  2. 02 Tahoe Transfer Case Shift Motor
    By mortalwombat in forum GM Powertrain
    Replies: 3
    Last: 04-26-2009, 12:28 AM
  3. Can't Shift into gear!!! 1995 tahoe
    By Jstnwhlr27 in forum GM Powertrain
    Replies: 0
    Last: 05-05-2008, 11:09 AM
  4. 2002 tahoe slips on 2-3 shift
    By 99fxst99 in forum GM Powertrain
    Replies: 2
    Last: 02-27-2008, 01:41 PM
  5. 2005 tahoe idling rough
    By zach91 in forum GM Powertrain
    Replies: 4
    Last: 01-25-2008, 03:39 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts