sweenymick

I'm looking to mount a th400 or a 700r4 trans to my 99 5.3 and was wondering what spacer I should go with? Gm has one, part # 12563532 and was wondering if thats the one to get or if someone else has a solution to this problem. Also should I run a sbc flexplate or go with the one that came with my motor. Thanks

gofastwclass

iTrader: (2)

You need the Gen III flexplate, not the SBC flexplate. Several people make the spacer, they are all pretty much the same concept with a slightly different design.

A bit of light reading for you... https://ls1tech.com/forums/17524056-post13.html

x275radial

iTrader: (1)

I got one from hughes for like 30 bucks and oval'd my holes on the flaxplate.