GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 5 of 5
  1. #1

    Default Tranny wont shift

    Ok first off i got an 88 suburban 6.5 diesel 4x4 automatic and my tranny wont get out of first gear. When i bought the truck there was a problem with the tranny but i was able to get out of first gear and into second. One day i decided to take it to a car wash and i get on the road and cant get out of first. It just happened overnight. Now when i got the truck it had been sitting for 2 years. When i drove it I would have to pretty much redline the rpm, let off the gas, then it would slip into second gear. A year later and it doesnt switch at all. I dont know anything about trannys so any help is greatly appreciated.
    88 CHEVY SUBURBAN 4X4
    6.5 DIESEL
    265-75-16 MUD TIRES
    BLACK STEEL WHEELS



    01 FORD RANGER 4X4
    3.0 V6 3" BODY LIFT
    33-12.50-15 MUD TIRES
    15X10 BLACK SOFT 8'S

  2. #2

    Default

    See if you can find the vacuum modulator (I think yours has one) on the passenger side of the transmission. Make sure the vacuum line is hooked up at both ends and there are no holes in the line. If everything is hooked up fine, the modulator may have gone bad.

    Have you tried shifting it manually?

    It should look like this:

    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  3. #3

    Default

    Thanks im gonna go look at that in a little bit. I have tried doing it manualy but didnt have any luck. Thanks alot for the picture refrence, that will help alot
    88 CHEVY SUBURBAN 4X4
    6.5 DIESEL
    265-75-16 MUD TIRES
    BLACK STEEL WHEELS



    01 FORD RANGER 4X4
    3.0 V6 3" BODY LIFT
    33-12.50-15 MUD TIRES
    15X10 BLACK SOFT 8'S

  4. #4

    Default

    I checked the vacuum modulator and the hose was still connected. Im gonna replace it but does any one know where i can get one. I tried searching for one but cant seem to find one
    88 CHEVY SUBURBAN 4X4
    6.5 DIESEL
    265-75-16 MUD TIRES
    BLACK STEEL WHEELS



    01 FORD RANGER 4X4
    3.0 V6 3" BODY LIFT
    33-12.50-15 MUD TIRES
    15X10 BLACK SOFT 8'S

  5. #5

    Default

    Looks like O'reilly has them for around $20.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

Similar Threads

  1. truck wont shift out of 2nd
    By Sicksilverado781 in forum GM Powertrain
    Replies: 9
    Last Post: 04-14-2010, 06:59 AM
  2. Changed Tranny Pan - Now D wont work...
    By novaman64 in forum GM Powertrain
    Replies: 7
    Last Post: 07-27-2009, 09:17 AM
  3. abs light stays on and tranny wont shift out of first
    By corova in forum Lifted & Offroad Suspension
    Replies: 0
    Last Post: 05-11-2009, 12:52 PM
  4. 02 Silverado: Flashing service light, wont shift from 1st to 2nd????
    By agent47_tjr in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 6
    Last Post: 12-17-2008, 05:21 PM
  5. Shift Kit for a 700R4 Tranny
    By Crawdaddy in forum GM Powertrain
    Replies: 1
    Last Post: 12-05-2007, 11:10 AM

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
  •