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4L80e shift problem Kevin muller 2-20-09  
Hello, I have a 94 GMC 4x4 dually with a 4l80e trans. Last week drove fine, Left is set for 4 days. When i drove it on the 5th day it will redline the engine and not attempt to shift into 2nd gear. If you get it moving in 1st wind the engine up, let off the gas pedal it will shift missing 2nd gear and going straight to drive. Revers and drive /overdrive all work great fluid is not burnt. still looks very transparent red with no burnt smell. I need some advice. Solenoids? input/output sensor? or toasted trans? or something i have missed?
Re: 4L80e shift problem Kevin muller 2-20-09  
Oh 1 more thing i forgot i have no check engine light on with this problem
Re: 4L80e shift problem mike verdetto 3-4-09  
1/2 shift sol is bad. scan it erase the codes or it won't shift. need a scanner taking the battery cable off won't clear the codes. esp. on new veh.
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