Rebuild th400 or 4l80e?

[82BBC20]

I’ve got a 82 C20 454/TH400, I wanted to keep mine old school no computers, added a gear vendors unit which helped but with 4:10 gears still wasn’t where I wanted to be so I’m changing gears to 3:42 now.

 

[Ricko1966]

I’ve got a 82 C20 454/TH400, I wanted to keep mine old school no computers, added a gear vendors unit which helped but with 4:10 gears still wasn’t where I wanted to be so I’m changing gears to 3:42 now.

You do not have to have a computer to go 4l80. It takes mods to put on vacuum modulator,and a little wiring.

 

[82BBC20]

My understanding has been that if you want it to shift automatically it needs some type of a computer, either a aftermarket setup or a used ecm from a obs truck. I changed my 92 C2500 454 suburban to carburetor with a 4L80 & used the stock ecm with a Holley tps & some wiring to capture speed & rpm’s. I know guys that have done swaps with 4L60 without computer but got tired of manual shifting.

 

[Ricko1966]

My understanding has been that if you want it to shift automatically it needs some type of a computer, either a aftermarket setup or a used ecm from a obs truck. I changed my 92 C2500 454 suburban to carburetor with a 4L80 & used the stock ecm with a Holley tps & some wiring to capture speed & rpm’s. I know guys that have done swaps with 4L60 without computer but got tired of manual shifting.

You're right, you would have to shift with switches or by manually moving your shift lever.