2002 GMC Sonoma Loss of Gear

Tiny
MIKE_67
  • MEMBER
  • 2002 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
I reccently lost my reverse gear I have all forward and Park but no reverse is this an indication that I will need to replace the transmission when using the truck the day before it gave absolutely no indication of a problem.
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Sunday, December 13th, 2009 AT 6:57 AM

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Tiny
SERPENTRACER
  • MEMBER
Yes, you will have to get it rebuilt, buy a new one or rebuilt, or buy a used one.

The 4L60E transmission in these trucks are terrible for going out.
They like new fluid and filter every 50k miles to keep them working properly.

I think their problem stems from how gm programed the shift points and firmness(or lack of)
they are a lazy shifting transmission. Contrary to popular belief about automatic transmissions, the harder the shift the longer the clutches last. Because they are slipping to give you that soft shift, they will wear out faster.
These transmissions are also known for their "shudder" under acceleration. Which is also a indication they are not locking up enough from what I was told. Some newer fluids claim to stop this and I've found that to be true with mine.
Penzoil stopped mine from that shudder.

Gm vehicles are ok, but I think they use cheap junk for the fluids these days.
The sooner you get all the stock fluids changed in these trucks the better off they are.
That includes the coolant especially. Change it to standard long life "green" coolants.
Gm lost a class action lawsuit over their "dexcool" coolants were proven to be harmful to some of the gaskets they were using on the intakes manifolds. But thanks to the bailout. They no longer are paying for the repairs.
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Saturday, December 19th, 2009 AT 6:44 PM

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