Author Topic: GMC Sierra delayed overdrive  (Read 2525 times)

lmcurto

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GMC Sierra delayed overdrive
on: December 18, 2010, 05:23:34 PM
recently I had my 2005 GMC Sierra 1500's transmission flushed and refilled, the mechanics didnt see anything wrong, no metal shavings, no nothing, well starting off it will lurch forward at times, others its smooth, and then once the spedometer reaches ~30mph, the rpms go sky high and overdrive wont engage out of 3rd gear, if I press down on the accelerator pedal the rpms will go higher, almost sounds like its in neutral, and eventually it will finally kick into overdrive, and sometimes it wont, after I go through this initial mess, the truck has no further problems driving around town until I turn off the engine, then once I start off again I get the joy of going through the same headaches until the overdrive will finally kick in that first time then everything is all hunky dory, it seems like something is sticking possibly but after that first stick is released, runs fine, can someone please help in any advice on what I should look at, I'm hoping that I dont have to have the transmission rebuilt but any advice would be greatly appreciated in figuring out whats going on with my truck, thanks
« Last Edit: December 31, 1969, 06:00:00 PM by lmcurto »

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discretesignals

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Re: GMC Sierra delayed overdrive
Reply #1 on: December 18, 2010, 06:29:18 PM
Need more information:

Which engine?
Which transmission?
4wd or 2wd?

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lmcurto

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Re: GMC Sierra delayed overdrive
Reply #2 on: December 19, 2010, 10:53:50 AM
5.3, 4x4, not sure on the tranny to be honest

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discretesignals

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Re: GMC Sierra delayed overdrive
Reply #3 on: December 19, 2010, 11:22:07 AM
4L60E


4L80E



4L60E on the left and the big ole 4L80E on the right


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