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4L80 Help.



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Old 01-26-2012, 07:52 PM   #1
Flex Master
 
Join Date: Sep 2011
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4L80 Help.

Hey There, Peeps.

I need some help on my 4L80 that I have. Let start with the info on the tranny, it's a 2000 4L80that has 40 K on it. It is backed with a BW4401 T-Case.

OK, my good friend 67_SS396 installed a Transgo 4L80E-3 kit in it, this kit eliminates the computer so that the driver has full control over shifts. The trans was then installed in my Daily 1988 Crew Cab Chevy 454. It shifts from 1st to second just fine, but when I shift from 2nd to 3rd or drive it does nothing, then from drive to OD it shifts. Max MPH I can get it like 45 before I'm at 3k RPMs. If I back off the throttle and try to "hold" the MPH it slows down but also the RPMs fall like it's in OD but will not hold soon as the throttle is pressed it goes right back to 3k RPMs. 67_SS found some information that the comfort setting does not work on this kit, so we pulled the valve body off again and drilled the spacer plate for the all out mode and cleaned up the 3 to 4 shift plunger and put it all back together and no change at all. I am stumped and trans shops I don't trust. Is there anything you guys could offer ??
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Old 01-26-2012, 09:49 PM   #2
Flex Master
 
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Re: 4L80 Help.

Vacuum modulator? I think the full manual kit requires one to replace the electric speed sensor. Check your vacuum line & modulator
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Old 01-27-2012, 07:14 AM   #3
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Quote:
Originally Posted by dabshr View Post
Vacuum modulator? I think the full manual kit requires one to replace the electric speed sensor. Check your vacuum line & modulator
There is one hooked up, I will check it out. Thank You. I know Ryan said we may need to adjust it, so I'll check that out !!
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1986 S10... The dime.
60/70 350/465/205/205/3:55's. 4 link front one link rear. 44 TSL's
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Old 01-27-2012, 08:37 AM   #4
Flex Master
 
Join Date: May 2007
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dabshr is a jewel in the roughdabshr is a jewel in the roughdabshr is a jewel in the rough
Re: 4L80 Help.

Post up some pics of your truck, my buddy is swapping in a 4l80 in his crewcab 2wd also with a tbi 454...
__________________
84 Scrambler Bobbed AMC360 TF727
Klune2.7 d300 lomax 4to1 32sp outputs, 112"wb
14" fox 2.0 3link frt
d60 OX d70 Detroit 4.56 42" IROKs
47 cj2a "GPW" L134 T90 d18
d25 open, d44 open 5.38 31x10.50s
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Old 01-27-2012, 08:55 AM   #5
Flex Master
 
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Quote:
Originally Posted by dabshr View Post
Post up some pics of your truck, my buddy is swapping in a 4l80 in his crewcab 2wd also with a tbi 454...
I'll do ya one better. Here is my photo bucket about 200 pics, The truck strarted life as a R20 2x4 and today is a R30 4x4. Let me know what you think. Thanks for the help !

http://s1210.photobucket.com/albums/cc410/crewcab881/
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1986 S10... The dime.
60/70 350/465/205/205/3:55's. 4 link front one link rear. 44 TSL's
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