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 5 of 5
  1. #1

    Default fan belt problem

    hi i have a 383 stroker in my 1988 c1500 i have a big problem every time i accelerate hard it throws my fan belt off which is major annoying i have checked that all the pulleys are in line its a serpentine belt that runs everything please someone help me i had to put it back on twice tonight in the rain on the side of the road

  2. #2
    Jr. Engineer 4x4squared's Avatar
    Join Date
    Dec 2011
    Fort St. John, BC


    Before you buy anything, make sure the belt is routed correctly lol if it is, go to your local auto parts store and ask to see a belt for your truck and compare. If the belts stretched out it can slip off. Also make sure your tensioner is working correctly, obviously if it's not holding the belt tight, it'll come off. Let's hope its as easy as a new belt or needs to be routed differently haha

    5.7L 350| .420 Cam | Bored 0.030 | Edelbrock intake manifold | 600 Cfm Edelbrock Carburetor | Long tube headers | Shift kit | Chrome dress up kit | Flowmaster 40's exhaust | Edelbrock heads | Custom paint

    "Don't judge a book by its cover."


  3. #3


    Check tensioner and proper depth in puley's. Are Pulley's stock or aftermarket? Belt if not new may be stretched but usually tensioner compensates for that.
    Maybe have some other person step on the gas while hood is up and see if you can identify from there. Be careful . Belt slaps hurt, got slapped by a blower belt and it does leave a mark.
    2010 Chevy Silverado Z71 ext cab.4x4
    72 Monte Carlo 350-415 hp- sold (June 2011) to pay medical bills
    79 Impala 350 4bbl 375 hp- sold (June 2011)to pay medical bills

    "If He asks you to go a mile go two"

  4. #4


    If all the stuff 4x4 and coach said to check check out. You might need under drive pulleys. Don't now what rpms your running on your 383 compared to stock rpm's but I assume when you say hard acceleration I assume high rpm's to. Also check to see if there is unusually high amount of drag on your acc. pulleys. Good luck.
    "If it ain't one thing, it's a mother******g nother"

  5. #5


    Hi thanks guys I appreciate all the input Thanks 4x4 the belt is running the right route( unless because I'm in the southern hemisphere it runs backwards like a toilet lol) Thanks coach I have had two different length belts to try and fixout but both come off the shorter one on start up the longer one on acceleration I have had someone rev it while I watch but it happened so quick I couldn't see anything thanks dedmon I don't have huge rpms because the belt won't stay on long enough so the only thing I haven't tried is the tensioner I hope that's the problem otherwise I might buy a ford !!!! just kidding!!!!!!

Similar Threads

  1. Fan Belt Squeaking
    By Phat 02 Silverado in forum GM Powertrain
    Replies: 9
    Last: 08-30-2011, 08:13 AM
  2. Seat belt
    By Bamf in forum General Chevy & GM Tech Questions
    Replies: 5
    Last: 04-21-2010, 10:37 PM
  3. '98 Seat belt problem
    By PurdueGuy in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 4
    Last: 08-09-2007, 07:36 AM
  4. 2000 z71 belt/pulley problem
    By gth in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 4
    Last: 04-16-2007, 11:45 PM
  5. Seat belt problem in my 02 trailblazer
    By tblazermom06 in forum Chevy Trailblazer Forum (GMC Envoy)
    Replies: 4
    Last: 08-04-2006, 09:45 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