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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 07-30-2006, 10:07 PM   #1 (permalink)
vminspector
 
Join Date: Jul 2006
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4l80e not shifing out of second gear

1991 gmc whit a 350 the tranny does not shift out of the second gear the tranny was check at the tranny shop and they say that there is noting wrong inside.there is not code.anybody had that broblem before i Need some advice before i spend to mutch money on that véhicule.


Last edited by vminspector; 07-31-2006 at 06:10 AM.
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Old 07-31-2006, 07:32 AM   #2 (permalink)
roebling
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Throttle position sensor?

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'93 GM 6.5L turbo & 4L80E, all hung backwards by Spartan Chassis and slipped under 31' Class A Gulfstream (pusher.) Remarkably like C/K 3500 but Dana axles, 10K#s rear, 6K steer, Bendix disc brakes x4 & Accuride 19.5" wheels. 81,000 miles. 10 1/4 mpg!
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Old 07-31-2006, 10:10 AM   #3 (permalink)
Mike L.
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You need a better trans shop to check it. I would start with scanner and moniter both speed sensors and both shift solenoids. Being that it's a '91, you need to change internal and external main harness to trans.
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