99 Silverado 1500 swaping 4l80e

[Bmxpunk1001]

I'm looking at ditching the 4l60e and going 4l80e just want to make sure I'm getting the right transmission not sure on what years work with what I know the wiring has to change a little trans lines have to be changed and shorter drive shaft and spacer for my torque converter and the flywheel from a 6.0 if I'm "correct" which I may not be but if I buy a transmission from older then 99 will I need to change anything else or will it bolt right up with all the other changes

 

[BIGR]

Welcome to The Truck Stop.

I am sure some of these very knowledgeable guys will chime in soon with some advice.

 

[snarl95]

Why the swap?

 

[Bmxpunk1001]

My 4l60e is losing 2nd and overdrive and I'm gonna be make some engine upgrades and be right around 6 to 700 hp and 4l60es cant handle that so I was gonna go 4l80e if it goes out I'll get it built and be good to go

 

[William3533]

I have a 95 Chevy 1500 or Z71 change the transmission and it runs like s*** what's the problem