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4L80E slipping in first then not shifting

ak diesel driver said:
Need to rebuild that trans then don't do a swap/exchange
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/\_/\_/\_ WHAT HE SAID _/\_/\_/\
Do a search in this forum about the transmissions, or go to the transmissions portion and start reading.
Just since I have been a member of this forum, there are enumerable threads about people that made the purchase of a reman transmission from some parts supplier, or transmission shop, the transmission was the wrong year model for their vehicle.
Then after discovering that the transmission from an OBD1 vehicle is not compatible with the transmission from an OBD2 system, then play hell trying to find the proper transmission to fit their certain year of a vehicle.
There are even characteristic differences between the OBD1 transmissions (what Yours is) in the different years.
IIRC the 93 and 94 year transmissions might be in a category all to themselves.
I might be wrong on that but something about the 93-94 seems stuck in my head.
Oh yeah, welcome to the forum Brodie.
 
Yeah so what @ak diesel driver said, either rebuild Your transmission yourself or have a very, very, reliable shop rebuild Yours.
Be very careful the shop You choose.
Some shops are very warm on warranty work, even after enough times to make the transmission right, to shops that are effe you on the second and following followups.
Read some threads and posts and You will see.
 
Will L. said:
Haha, you just jumped to the next level with that connection.
Now that it won’t overflow and soak the outside of that connection, clean it with electrical cleaner inside & out. Drive and see if atf leaks through the connection.
If so that short harness needs replaced. But there is a 90%+ possibility you are needing a full rebuild/replacement. So how much money you pour into trying to save this trans is something you need to determine ahead of time.

A warning- something many many people do is find another used 4l80e and assume they all interchange. They don’t. From here is time to start finding defective parts and replacing them with crossed fingers, knowing all the money is a waste most likely slipping 1st & reverse.
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This transmission was rebuilt just 7,000 miles ago before i bought the truck and the owner showed me the receipt and everything
 
brodie said:
This transmission was rebuilt just 7,000 miles ago before i bought the truck and the owner showed me the receipt and everything
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Is it guaranteed?

I would take it to where it was rebuilt and see if they stand behind their work.

I'd do that ASAP.

If you mess with it much, they might be less inclined to warranty any work.
 
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