Question about GMC Sierra 2500HD

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Shifting from overdrive to drive at 55/60 mph and not all the time but mostly during high mosture days or rain. transmission is 4L80E 1996 GMC 3/4 10,000 GVW.

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So whats the main problem here?

Posted on Jul 30, 2008

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Posted on Jan 02, 2017

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How to properly engage and dis-engage 4 wheel drive 0n 1996 gmc sierra


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  • Shifting from 4HI to 2HI Press and release the 2HI button. This can be done at any speed, and the front axle will unlock automatically.

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This problem first began last Fall. Every time there is any rain or moisture, I can guarantee that when I start my 2002 Kia Rio Cinco, it will shudder and rattle, and it will barely be able to accelerate...


somehow moisture has effected your transmission sensors causing you to have chatter and play with your shifting. change your transmission fluid and change filter too. you could also be having a torque convertor stuff clutch stuff off problem. also sounds like you are having charging system problems too. take the positive terminal off your battery and if car dies then it is also your alternator.

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2. Do you have any transmission faulty code
3. If you pull a trailer, heavy load there is a function in PCM (powertrain control Module) that raise the pressure to compensate the slip at clutch pressure and if you unhook the trailer and go on the highway before the PCM learn it, it will shift hard. What GM call the "shift adapt". You probably have a 4L80E for transmission or the 4L60E depends on the truck's options.
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overdrive should be activated by a solenoid ..internal and perhaps an external one also.. in 89 the computer was primitive and i dont think controlled shift points..also if engine health is bad or missing or vacuum to any cacuum modulator at trans is damaged or compromised.. these issues could occur...good luck

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mine does the same thing i cant figure it out

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