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4l80e transmission problem Don Smyth 10-11-10  
1994 Chevy 2500 4l80e transmission. Works when cold as it warms up the speedometer quits and as you slow down you only have first gear. Let it cool off and it does the same thing again. Replace the speed sensor on outside of trans, same problem, Any ideas?? Thanks don
Re: 4l80e transmission problem BUBBA THE BUS TECH 10-12-10  
There is a small computer box under the dash I think. (Chev used it for quite a while) Its called a drack(?) andf it splits the speedo singnal to speedo, trans computer, engine computer, Cruise control, etc.
Good Luck
Re: 4l80e transmission problem randy 10-18-11  
1989 chevy 3500 dually 4l80e trans when you pullit in gear it does not do don't attempt to move. what is the problem?
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