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4l80e Transmission problems

Home > Discussion Forum > Mechanic's Corner - Transmissions

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4l80e Transmission problems Will 2-8-07  
I have a gmc sierra with a 4L80e. seems to stick in 2nd when i stop, cannot manually shift it out either. and when the engine is hot, i have no power like it's slipping. fluid is clean. Any suggestions?
Re: 4l80e Transmission problems Mike 5-24-07  
I have a 93 gmc 1ton dually with 4L80E trans. Truck will shift into overdrive sometimes but most of the time I have to stop, shut off eng & start again & it works fine. Any ideas?
Re: 4l80e Transmission problems Russ 3-16-07  
I have a 99 4L80e on a motor home with 49,000 miles. On a long trip, tranny stopped shifting into OD. At home next day, after unit had cooled, OD worked fine again.

I decided to have the fluid and filter changed. Nothing found in the pan, but filter was very dirty. I got a fluid flush to get as much fresh fluid as I could in the tranny.

Shifting did improve and was very happy until I tried to back up. Reverse was almost non existant.

Since forward was working so well, I decided on a short trip (no backing) and see if circulating fluid would help.

Upon return, I had a slightly stronger reverse. So another trip, slightly longer. Well three trips later, I have reverse working fairly well again. My next step is back to the trans shop for another fluid flush and filter replacement.

I "think" my probelm was dirt in the tranny that clogged the filter. During flush, some of the old stuff got into the reverse part of the system. Now that both forward and reverse are working as they should, I want to get one more flush. The first helped greatly and figure the second can't hurt and might get me back to fully functional.

Don't know if this is of any help to you, but it's all I have to offer.
Re: 4l80e Transmission problems Ted Berquam 8-25-07  
1994 motohome 4L80-e trans
only backs up once in a while most times just locks up.
If I shift from park or from N no change and I checked the linkage and no back lash in cable or lever.
When I try to pull down in low gear it just stays in second.
It also up shifts early unless I put my foot heavy on the gas and then it lugs up to hiway speed 55/60.
Re: 4l80e Transmission problems dorian v 11-14-07  
What type of repairs were needed for your problem mine does the same and now wont shift past 1st while in drive all other shift transactions work fine do u think i could a linkage or filter issues. what suggestions do u have
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