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4l80E shifting problems John Emerick 12-6-09  
I just rebuilt an 4l80 E. It has great pressure throughout the range. It does not have first or fourth gear. I can hear the solenoids engage.
Re: 4l80E slipping tony 2-2-10  
Cooland get in to trany.Replaced radiator,replaced filter and trans fluid 3 times.then trans start to slip in all gears,except reverse.
What wrong with my trany?
Can i fix the problem?or i have to replace the trany.
thank.
Re: 4l80E shifting problems david holeden mechanic australia 3-10-10  
Response one(john emerick): possibilty of clutch packs reinstalled incorrectly else if works "manually selecting gears" then check valve body components e.g. edges of valves and if valve body is PERFECTLY flat especially towards center section.

response 2 (tony):if coolant has entered the transmisson clutch packs and bands will have absorbed the ethyl glycol and changed their "lock/binding" qaulities, sorry bud but time for a rebuild:(
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