4L60E to 4L80E conversion in a GMT900

[farmtruc]

we bought every part and tried everything we would think of with the stock 60e tcase, no parts we bought were interchangeable.
we tried to install the larger shaft to accommodate the larger output shaft of the 80e.

We ended up putting an 80e tcase in the truck, of course went right in, but now the controls don't work.

the 80e case has a different connector setup and missing one solenoid, if i remember correctly.

we'll get back on it in a couple weeks, customer dropping off for a whole for us to ts.

[FRANKO]

nice I will b waiting for the results

[FRANKO]

I wonder if U could use the mp3024 tcase from wat I read its a 32 spline

[KHester84]

I'd be curious to see if the 3024 case would work also...

[PEWTERLIFTEDZ]

dang i was really hoping this had been figured out. i thought maybe a 6l80e autotrac transfercase input shaft would work.

[PEWTERLIFTEDZ]

another option is that the output shaft from the 4l80e could be changed out to a 27 spline output. i know they are out there.

[TTU713]

I'm a little confused on this part

"This means, you must replace the factory 5.3L flex plate with a flex plate and spacer from any 2002+ ¾ HD GM truck that originally came with a 4L80e transmission."

I thought as long as the flexplate is off a chevy, and has 6 torque converter bolts, it will work????????? I plan on using a flexplate off a 1998, but after reading this I am worried I might have to find another flexplate

[RedHeartbeat]

I'm a little confused on this part

"This means, you must replace the factory 5.3L flex plate with a flex plate and spacer from any 2002+ ¾ HD GM truck that originally came with a 4L80e transmission."

I thought as long as the flexplate is off a chevy, and has 6 torque converter bolts, it will work????????? I plan on using a flexplate off a 1998, but after reading this I am worried I might have to find another flexplate

I used the spacer with long bolts and flex plate from an 02 originally. I now have a three bolt custom converter that bolts directly to the stock 60e flex plate.
you should be able to use the six bolt flex plate if you buy the spacer and longer bolts it you are using a stock converter and you dont have a 6L with the already longer crank extension.