How easy would it be to swap a 4L60e for a 4L80e

Shannen Durphey shannen at grolen.com
Sat Mar 13 19:40:09 GMT 1999


Doug Bazarnic wrote:
<snip>
> 
> So the $100 question is: How easy would it be to swap the 4l60e vs the
> 4l80e.  Can the stock computer talk to a 4l80e without any probs?   I've
> got the mastertune software that lets me change what ever I want, so shift
> points / line pressure wouldn't be a problem, if the stock computer can do
> it.   Also, are the wiring harness connectors the same?
> 
> Thanks,
> 
> Doug Bazarnic
> 
> P.s.  If anyone is interested in my calibrations / chip sw, lemme know, as
> I'd be happy to share.
Hmmm...good question.  Same ECM, so there should be a minumum of
wiring.  There are physical differences, 4L80E is much longer and
heavier, and needs a different transfer case adapter.  I can't ever
remember seing the big trans mated to the 241 transfer case, so you
may be looking at a custom machined part for that.  Hopefully I'm
wrong about there.  I've never researched performance converters for
this one, it's got a dual stator+tcc, supposed to be real good for
torque.  If you find any replacements, pass the info along.  There's
an additional speed sensor to wire in, the connector at the trans is
different, PCM calibration used is definitely different between
4L60E/4L80E.  One gotcha that I can see is that line pressure in the
4l80E trans, controlled by pcm, is calibrated to one of two  pressure
control solenoids, and solenoids are not to be interchanged.
(Unwritten, of course, is "without swapping the cal".)  So
calibrations are trans specific. You'd want a trans and calibration
for 94+ to prevent problems and get the best "stuff".   

Is your software for both types of trans?  Or is it for the 4L60E
only?  Might not work on 4L80E.

If you don't mind sharing , I love to collect different calibrations. 
Maybe post it in the incoming directory?




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