I want to swap a 4l80e into my 1500. It's a 03 4x4

What year trans should I look for or is there even a difference. I plan on rebuilding it anyway. Also what do you recommend doing to it to hold up to twin turbos and 35" tires. Looking to run around 7psi on a 5.3l

Thanks for the help!

 

This topic comes up often. IMO I would use a 99 and up unit. I like the fact that it has the correct bell for your engine and also you can run a structural inspection cover. This allows bolts to be installed into the engine oil pan as well as the 12 o'clock bolt hole in the bell housing.

 

Vince,

Is anything upgrade through the 99-07 4L80Es from the factory?

 

I would say no if anything I like the 99-00 units best. Reason being is the OD roller clutch IMO is weaker in the later units. The years I mentioned have a larger OD clutch rollers which I have seen less failures with. The later style works fine in applications where a guy is not beating the snot out of the thing all the time. If I had to put a hp rating on it I would say 700rwhp. You can retro back to the earlier stuff without an issue if you were to have a failure.

 

Thanks for the help!