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post #1 of (permalink) Old 09-07-2000, 11:58 PM Thread Starter
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Need help with 4L80-E Trans.

I have a 95 2500 Sub 4X4 with the 454 and the 4L80-E trans, it has 71,000 and I have owned it since 59,000. The Sub is used on the
weekends as the family car and about once a month is used for towing a CJ5.

About 2 months ago while towing the CJ5 I started smelling trans fluid so on the following Monday I had the Chevy dealer do the power
flush to change the fluid. Now while driving it seems like its slipping, going into OD it seems like it doesn't fully make the up shift. If I let off
the gas and then floor it it will complete the shift. The fluid smell is gone though.

Do any of you have any info? The CJ is an 83 and I know the Jeep inside out, the Sub is a different story and I don't want to get screwed
taking it to a shop without some knowledge from you guys.


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post #2 of (permalink) Old 09-10-2000, 02:40 PM
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Re: Need help with 4L80-E Trans.

It sounds like you may have overheated it, the trans may have a bad seal or clutch pack. The sprags seem to be a weak point, also. The Hummers seem to go thru these trannys quite regularly at our dealership, the newer ones have many improvements. Whatever is wrong with it, add the largest cooler you can find.

Good luck!

post #3 of (permalink) Old 09-11-2000, 07:45 AM
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Re: Need help with 4L80-E Trans.

I have a 4L60 (which is a lighter weight version of your 4L80) in my '96 K1500. I burnt it up several months ago while trying to go up a hill in overdrive. Symptoms at first were similar to yours, OD slipping then it would shift back to 3rd and try to find OD again. Finally it locked into 4th and the tack went to 4K so I let off and had to drive home in 2nd. When EITHER 3rd or 4th go, BOTH gears are gone, something with how it's built inside. I got quotes to rebuild it for $1K with a 6mo warranty. Ended up getting a deal from the dealer, $1300 and a 50K warranty, transferable to the next owner (I will NOT own the truck when 50K is up!)
Just keep an eye on yours and don't go into OD unless you are over 50mph, that'll increase the life of it.

[img]/wwwthreads_images/icons/cool.gif[/img] Big Ed
<font color=red>'88 YJ, 4" susp,3" body,35's,283 Chevy V8,TH350,4.11's,D30,D35c</font color=red>
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