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 3 of 3
  1. #1

    Default 90 K1500 I have a few issues i need help with

    I bought a 90 K1500 w/5.7L 700r4 auto trans and a G80 rear-end. I was told all was good except for the engine. Well to make a long story short none of the drive train parts work. I had an extra 5.7L engine laying around already along with a GT4 rear-end from a 94 GMC K1500 that had a 4.3L with a manual trans and a 400 turbo trans and transfer case from a 89 K2500 if i can use it but thats the BIG question "IF"............ Somebody please help i've been with out my truck for WAY TO LONG...................

  2. #2
    Jr. Mechanic
    Join Date
    Apr 2013
    East Central Iowa


    Sounds like a project. The engine,and trans should all bolt up together.May have to modify the cross member alittle and do something with the drive shaft.Not sure of yoke difference from 700R4 to 400 turbo. The 400 trans wont have the overdrive or the electrical connector. The rear end may be the problem. Really need to make sure it is the same gear ratio as the front diff. That will cause problems if they aren't.

  3. #3


    I found out that the biggest issue id have with the 400 turbo is hooking up the detent solenoid. The front diff in it now also came from the 94 Gmc but after installing it i noticed that the passenger side axle shaft is slightly pulled out. The front diff that came with the 90 Chevy is sitting in my garage due to i figured it was bad also but it could be good.

Similar Threads

  1. 90 k1500 a few issues
    By studibakre in forum Chevy C/K Truck Forum
    Replies: 3
    Last: 03-05-2013, 12:14 PM
  2. guage issues 88 k1500
    By kcin865 in forum Chevy C/K Truck Forum
    Replies: 2
    Last: 10-03-2011, 01:43 PM
  3. 97 gmc k1500 4x4 issues :(
    By Rejekt xo in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 04-02-2011, 12:54 PM
  4. k1500 timing issues-need help
    By cameronc in forum Performance & Fuel
    Replies: 7
    Last: 06-12-2010, 03:20 AM
  5. AC Issues with a 93 K1500
    By remist17 in forum General Chevy & GM Tech Questions
    Replies: 0
    Last: 06-26-2009, 11:57 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