old school - installing a THM 400
Thread Starter
TECH Apprentice
Joined: Feb 2011
Posts: 316
Likes: 0
From: Central Florida
old school - installing a THM 400 Well guys, I am already old fashoned with my 4 barrel carb so I figured I'd get a turbo 400. All I need now is to ditch my Ipod and get an 8 track player!
I've spent much coin on 4L60s and 700s and they're just not surviving under my car. I'm going to get a 400 and beat on it and see if I can kill it behind this LQ9.
The car only weighs 3250-3350, but it hooks hard and has lots of torque.
I think my flexplate and spacer is going to work and I am pretty sure my crossmember and cooler lines will all work. I need a new yoke (and a driveshaft shop) and a converter.
please chime in if you've done a 400 behind an LSX
thanks
I've spent much coin on 4L60s and 700s and they're just not surviving under my car. I'm going to get a 400 and beat on it and see if I can kill it behind this LQ9.
The car only weighs 3250-3350, but it hooks hard and has lots of torque.
I think my flexplate and spacer is going to work and I am pretty sure my crossmember and cooler lines will all work. I need a new yoke (and a driveshaft shop) and a converter.
please chime in if you've done a 400 behind an LSX
thanks
Launching!
Joined: Apr 2011
Posts: 223
Likes: 0
here is what i ended up using..
take a look at post 54 and 55 of my build. i bought the hughes adapter that was supposed to be for the swap but what it ended up doing was holding the th400 convertor away from the flywheel so after some research i found that you can use this spacer, flexplate and longer bolts.
https://ls1tech.com/forums/conversio...-3-swap-2.html
take a look at post 54 and 55 of my build. i bought the hughes adapter that was supposed to be for the swap but what it ended up doing was holding the th400 convertor away from the flywheel so after some research i found that you can use this spacer, flexplate and longer bolts.
You either need a flat flexplate and the GM spacer (like the picture above), or a curved 4L60E style flexplate with the hughes adapter (can't guarantee that the holes will be the correct diameter with a th400).
Launching!
Joined: Apr 2011
Posts: 223
Likes: 0
i tried the dished flexplate and hughes adapter with a factory style th400 convertor and the flexplate wasnt far enough off the back of the block to allow the the convertor to mate up... i cant find the pics i took of it but there was a good 1/4" of space bewtween the dished plate and the convertor pads
