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

Shannen Durphey shannen at grolen.com
Sat Mar 13 20:36:54 GMT 1999


Brent W wrote:

> The 4L80E uses a different flywheel and torque converter. I'm not sure
> whether the crankshaft end would need to be reworked to mate to the 4L80E.

Oh, yeah.  Converter has 6 mounting lugs.  SB chevy crank bolt
patterns are divided in 1986.  If you need a different flexplate, and
if you've got the late crank, the correct 350/4L80E part will bolt up.
Shannen  
> Good luck,
> Brent Wiscombe
> bwiscombe at msn.com
> Mesa, AZ
> 
> _______________________
> 
> -----Original Message-----
> From: Doug Bazarnic <doug at ddelectronics.com>
> Date: Saturday, March 13, 1999 1:36 AM
> Subject: How easy would it be to swap a 4L60e for a 4L80e
> 
> >I just broke the input hub / shaft assembly for the second time on my '95
> >Chevy 1/2 ton truck.  It keeps blowing out the aluminum lugs that retain
> >the snap ring for 3rd gear.   I do have extra ponies under the hood, but I
> >don't see how the extra power would be causing this problem.  (It's 355
> >cubic inches, B&M blower, Air Flow Research Heads, large roller cam, Cola
> >Crank, Ross Racing Pistons, Eagle Rods, etc etc)  The truck only runs in
> >the low 14's, but this tranny breakage is nuts.
> >
> >The truck has a total of 42,000 miles on it and I've broken an Art Carr 10"
> >Torque Converter, and the aluminum input hub/shaft twice now.  The aluminum
> >hub is a cast piece of sh*t, and it's teeth that hold the snap ring in
> >place leave.  This last hub (which was brand new from GM and about 6 months
> >old) lasted less than 8,000 miles.   Either I'm putting too much thru this
> >tranny,  or it's a real piece of crap.
> >
> >Ohh, and by the way, I drive it like it was a Corvette on a road course!
> >It weighs in at 3944 lbs.
> >
> >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.
> >
> >
> >
> >




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