Th400 to lq4???

[BuiltZ71]

Well just picked up a th400,that I got a killer deal on!..what flywheel will I need to run to bolt up?I have the flat one without spacer..when I go to buy my converter,do I just get it for the th400?..also it looks like only 5 bolts will work,bolting the bell housing to the block..the th400 doesn't have the very top one..and the bolt isn't tapped for the one just to the right on the block..

[TurboMic]

Th400 flex plate Tci pn# 399753, just use the bolts that line up. I've been running mine like that for a long time with no issues.

[408Lbb]

Tci makes a ls to 400 flywheel. And the spacer for the converter u need. Hit zach up as he done same swap and has all part numbers. Screen name is chevrolade

[BuiltZ71]

Awesome,thanks alot guys!

[o2camaross]

you can also run a Circle D converter and flexplate. Thats what im running. It was $1100 for the pair

[farmtruc]

that spacer that comes with the tci flywheel for the ls engines is a pos!
it basically extends the snout of the converter so it goes into the crank.
that spacer free floats/spins.
the noise is creates sounds like you just screwed the trans install up.

solution, tig weld the spacer to the crank, only takes a few tiny tig tacks.

[BuiltZ71]

Ok thanks for the heads up Allen..is there no way I can run the flywheel I already have,and just buy a converter for the th400 to Ls?

[farmtruc]

as long as the offset is fine, you can opt to drill out the holes on the flexplate. i haven't done this, we either get the converter bolt holes mounts built for the trans/engine type or use the tci plate.

[o2camaross]

The flexplate from Circle D is $150 and is a direct bolt on and its SFI certified

[CHEVROLADE]

Th400 flex plate Tci pn# 399753, just use the bolts that line up. I've been running mine like that for a long time with no issues.

that spacer that comes with the tci flywheel for the ls engines is a pos!
it basically extends the snout of the converter so it goes into the crank.
that spacer free floats/spins.
the noise is creates sounds like you just screwed the trans install up.

solution, tig weld the spacer to the crank, only takes a few tiny tig tacks.

BIG +1.....that noise was fd up lol