L31/6L80e

[PWC Repair]

I really didn't want to read through all 11 pages but why would this not be an easy swap? I have a 1 ton '96 Express van sitting in my yard right now with an L31 and 4l80 combo. Why not just use that ECM?

 

[Supercharged111]

I really didn't want to read through all 11 pages but why would this not be an easy swap? I have a 1 ton '96 Express van sitting in my yard right now with an L31 and 4l80 combo. Why not just use that ECM?

Because it won't control the transmission.

 

[PWC Repair]

WHAT? Then what's controlling it in that van?

 

[L31MaxExpress]

WHAT? Then what's controlling it in that van?

A 4L80E is not a 6L80E or even close.

 

[PWC Repair]

A 4L80E is not a 6L80E or even close.

Yes, I know. What I'm saying is that I have a '96 van sitting here with an L31 5.7 and 4l80e from the factory. SO, if a fella wanted to swap their 4l60e out to a 4l80e AND it's going behind an L31 5.7, then why not just use the ECM from the van? It would swap in and control both no?

 

[Supercharged111]

Yes, I know. What I'm saying is that I have a '96 van sitting here with an L31 5.7 and 4l80e from the factory. SO, if a fella wanted to swap their 4l60e out to a 4l80e AND it's going behind an L31 5.7, then why not just use the ECM from the van? It would swap in and control both no?

Yes, but what does that have to do with this thread?

 

[PWC Repair]

Well,.....nothing I guess. I misread the info as swapping to a 4l80 NOT a 6l80.........I guess that's why I couldn't understand the difficulty.

Slow down.....no more speed reading LOL!

 

[Erik the Awful]

I saw @97Centurion a couple weeks ago and asked him to log in and give a report. No telling when that will happen, but he says it's running great.

 

[RDF1]

From what I understand, it's primarily due to a ****** torque converter and bad transmission tuning from the factory. On the 14+ 6l80s (haven't looked at older) they're tuned to slip the tcc 10-30 rpm when locked. They also unlock and relock every time they switch from v4 to v8, and some other stupid stuff.. tuned correctly I've heard they can hold good power.

But at the end of the the day 4l80 is king

The 6L80 and 6L90 will slip up to 120 rpms in 4cyl mode with AC on.

 

[Christian Steffen]

The 6L80 and 6L90 will slip up to 120 rpms in 4cyl mode with AC on.

That's gotta play hell on the tcc.