Transmision question
Thread Starter
Racer
Joined: Apr 2006
Posts: 300
Likes: 0
From: Joplin Missouri
Transmision question
I resently pulled out my stock 350 out of my 74 and dropped in a beautiful 496 big block. I have not had a chance to take the new engine to the local dyno but I estimate its performance hopefully 500+ HP. My question is, since I have never driving my car before the engine swap and have no idea about how good the internals of my 33 yr old TH400 are, would it be better to have it checked out and rebuilt if necassary or would it be better to but a different tranny? I figure since in 74 the 454s had TH 400s it should hold but I would like someones advice that has done the swap before and the outcome.
Thanks
Thanks
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
400'S ARE tough. Stick a shift kit (Trans-Go) in it and run it until it gives up. When it does, here a a few goodies-
Install a 34 element sprag and intermediate drum.
Use all the clutches and steels you can from a 4L80E trans. They are a little bit thinner so you can add 1 or 2 steels and face plates into each clutch pack, giving you way more clutch surface area. Be sure and maintain the recommended clearances in the packs!
Use the Trans-Go kit.
I built one like this for a 500+ CI Camaro- The guy was running way low in the 10's= KCIR told him to take it home and put a cage in it or stay home. Very streetable, no banging gears until you asked it to.
I almost forgot- HAVE FUN!!
Install a 34 element sprag and intermediate drum.
Use all the clutches and steels you can from a 4L80E trans. They are a little bit thinner so you can add 1 or 2 steels and face plates into each clutch pack, giving you way more clutch surface area. Be sure and maintain the recommended clearances in the packs!
Use the Trans-Go kit.
I built one like this for a 500+ CI Camaro- The guy was running way low in the 10's= KCIR told him to take it home and put a cage in it or stay home. Very streetable, no banging gears until you asked it to.
I almost forgot- HAVE FUN!!
