I recently purchased a gen III 5.3 to put into my truck and im looking to push 550 or more i know what i need for the engine but have no clue when it comes to transmissions im set on a 4l80e but i was wondering if there are any reputable sites i can purchase performance 4l80e or should i get one from a junkyard and take to a local performance shop? i have $3000 to spend on the transmission.

 

If you know that you can get a core cheap and have a place build it and be under that $3,000, that's not a bad choice.

A brand new rebuilt unit from GM is $2,365. You could do that along with a nice torque converter and be doing really good too.

https://www.gmpartsdirect.co/oem-par...77986-19177986

A stock 4L80e would do 500-600hp no problem.

 

I may consider buying a rebuilt thru GM what all would i need exactly? the 5.3 originally had a 4l60e attached to it. Is there a thread discussing this?

 

The jist is that you need the transmissions, get the cooler lines to work, torque converter, flex plate or get a 4L60e bolt pattern 4L80e torque converter.

The transmission cross member needs to be modded or you can buy a swap cross member. New driveshaft is needed as well to handle that power.

And tuning to make it all work. I'm sure there are swap threads floating around here somewhere.

 

thank you for the responses! appreciate the help