Bought a '06 Tahoe for the drivetrain

[legopnuematic]

A 4l80e is basically a th400 with lockup and overdrive. If your gearing/tire situation is as such, you just drop it back into third and it’s no different than a 400, but you still get lockup. With lockup that helps control trans temp, which is a good thing if you are towing. Both are 1:1 in third.

If you are going LS the harness/computer is pretty much ready to go for running an electronic transmission. These days the information/resources for swapping an 80E is so plentiful and supported there really isn’t any reason not to.

 

[Tonimus]

I was going to do a similar donor vehicle for mine, but my mechanic has recommended this Summit 5.3 for my '82 Suburban rebuild. He wants to put a tow kit in the TH400 and keep it, rather than do one of the 4L60/80 units. He doesn't think my towing mission will be well-served by running a 4-speed with larger tires.

However, I'm now thinking about going down to 31" tires (it's currently on 35s), which might mean going to a 4-speed would make sense. Hard to say which way is best...I'll also need to open up the diff covers and confirm the axle ratios. Lots of math to do here.

I run 31s too. I'm just on a 2wd chassis, and I like the look at the factory height. I'm keeping an eye out on the Gen VI BBC with 4L80. When it gets cheap enough, it'll be road trip time.

 

[Tonimus]

Well, it was road trip time. And the dumb ---- dropped the motor/ trans and broke the bellhousing right off.

I did get a Gen VI 454 for $300, though. Had to drive all the way to the Mexico border. Could see the border wall from the highway, only 1.25 miles south.

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Out of a motorhome a vagrant lit on fire. Supposedly 60k on the engine. Plan to tear into it tomorrow to look around.

 

[CountKrunk]

Was going to say that unit looked a little toasty