Transfer Case

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by tpkamp, Jun 9, 2010.

  1. tpkamp

    tpkamp New Member

    My 2000 GMC SLT Z71 just had a transfer case rebuild. Had new seals, gaskits, bearings, chains and fluid replaced. That solved the original problem of when at a low speed, 5mph or less the case sounded and felt like it was eating itself. It was loud and hard jerking. Once over 5mph it ran perfect. Shifting though the gears under normal acceleration and even full "pedal to the metal" perfect. Only at 5mph or less did I have the problem. I did limp truck home, luckely was only about 3 mile away and only had to stop once after I noticed the problem. Since being rebuilt with the new parts the original problem is fixed but I now have a brand new, never, ever happened before problem. When accelerating from a stop at around 35mph trucks seems to shift to neutral and the RPM's jump way up. Letting of the acceleraror for a second re-engages and I can continue on with no problems. It will do this several times but does seem to be less frequent when truck has been running a few miles and fully heated up. What could this be? The repair shop now says I need a tranny rebuild and I just don't believe that. I think there is something in the Trasfer case that may be slipping and they missed it and don't want to honor the warranty. What do yall think???
     
  2. MrShorty

    MrShorty Epic Member Staff Member 5+ Years 1000 Posts

    Sorry, but I'd have to agree with the shop on this one. Transfer cases are geared and almost never synchronized (which is why you have to stop and be in N to shift the t-case from L to H). Do you know that clunk you sometimes get when you shift from H to L? I would expect a significant clunk like that or worse if the t-case was really dropping into N and back into H at 35 mph.

    I might be inclined to pay a second shop to diagnose it for a "second opinion" If they come back with bad transmission as well, then I'd tend to agree with them. If the second shop does decide the t-case has continued problems, that will give you something to take back to the first shop.
     
  3. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    Pretty much what he said. Have you checked your transmission fluid level?
     
  4. tpkamp

    tpkamp New Member

    Followed yall advice. Took truck to Chevy House. They said Tranny is "Burned up". In Tranny shop now but so far they are telling me they think it's something else. Truck has reversed it's symptomes. Seems to be just fine until tranny heats up. As she warms up it begins to slip until she won't move at all except for idle speed. Steping on gas only reves engine, will not speed up and has no power. Engine seems to run just fine. What the hell??
     
  5. rastlin33

    rastlin33 New Member

    could it be oil cooler?
     

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