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Old 05-05-2009, 10:15 AM
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4L80E differences

I'm well aware of the year-to-year differences in the 4L80E. My question is, within a given model year, are there any substantive differences between one bolted to a diesel and one bolted to a gas engine (particularly a big block). Everything I can find makes it look like the gas and diesel versions are the same internally and that the only difference is in the software. Can someone confirm this? Thanks.

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Old 05-05-2009, 10:59 AM
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Hi Joe,
Here is what they had to say at the diesel place.
Rich

http://www.dieselplace.com/forum/sho...d.php?t=230542
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Old 05-05-2009, 11:13 AM
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Originally Posted by richard stewart 3rd
Hi Joe,
Here is what they had to say at the diesel place.
Rich

http://www.dieselplace.com/forum/sho...d.php?t=230542
Rich,

Thanks, but that unfortunately doesn't help exactly. I know about the electronic differences between the 91-93 and 94-up transmissions. I also would have assumed that a chip for a 4L60E won't work right for a 4L80E. In my particular situation I'm looking to replace the 4L80E in a 1999 gas truck with a 4L80E out of a 99 diesel truck. From what I can tell from the Factory Service Manual (all SIX volumes!) and other 4L80E literature that I have, the transmissions should interchange. I was just looking for confirmation.
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Old 05-05-2009, 07:08 PM
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the 4l80e will swap around if you watch the cooler line fittings and converter for the engine application.

the 4l80e only does what the PCM tells it too.

There is an early connector plug to watch for(they leak usually) , it is to be avoided in use and replaced with updated connector IMHO ...

Now..... watch the tail housing and yokes used. All 4l80e have drilled -threaded out put shafts cept for the short 4x4 shafts.

Some shafts have an internal sealing metal sleeve... these seal on the outside of the yoke , some have an O-ring on the out put shaft like the t-400 truck bolt on yoke... these seal on the interior of the yoke


hope that stuff helps
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Old 05-05-2009, 08:26 PM
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Quote:
Originally Posted by Crosley
the 4l80e will swap around if you watch the cooler line fittings and converter for the engine application.

the 4l80e only does what the PCM tells it too.

There is an early connector plug to watch for(they leak usually) , it is to be avoided in use and replaced with updated connector IMHO ...

Now..... watch the tail housing and yokes used. All 4l80e have drilled -threaded out put shafts cept for the short 4x4 shafts.

Some shafts have an internal sealing metal sleeve... these seal on the outside of the yoke , some have an O-ring on the out put shaft like the t-400 truck bolt on yoke... these seal on the interior of the yoke


hope that stuff helps
Yes, that confirms my suspicions. Thanks. I'm pretty well up to speed on both the internal and electrical differences (including the connector change and PWM motor logic change). I was planning to get a rebuilt converter anyway (I'll be rebuilding the trans myself). I was aware that there were converter differences based on the engine, but I'm still a little unsure about this single stator/dual stator converter thing. What's the difference? I assume that if I get a converter that matches my engine, I'm OK?
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