lxcoupe

iTrader: (9)

I'm putting a 6L90 behind an LS3. I'll be using an LSA converter (with 3 bolts). Can I use a 4L60 flexplate off, say a 2003 Tahoe 5.3/4l60? I thought I read a post that said they were interchangeable. Reason I ask is I have a 4L60 flexplate kicking around that I'd love to use.

randeez

This is all slightly off from what you're doing but to explain i dont think theres a difference:
I just put a tci flex plate in my truck. Has a circle d converter that was used with the stock engine (l94/l92/ls3) to the 6l80.
Tci doesnt have an application for a 2012 Yukon Denali (for some reason!). Asked them if I should use one for a 5th gen camaro (ls3/l99) to 6l80 as it should be the closest application - they werent sure.
Circle d gave me a part number when I looked it up was for ls1 car, I questioned them and said same thing about the Camaro plate was prob a closer match and they were confident that the part number they gave me was the one I needed, which I ordered, and worked out perfect
That being said I have my stock one out if you want me to measure anything off it for ya lmk

lxcoupe

iTrader: (9)

Thanks for the info! I'm still confused LOL. This 6L90 is a beast of a trans and I do not want to experiment with test fitments. No way Jose! I have a message out to Circle D, but I'd rather hear from someone who's actually done the swap. Ultimately I think what I want, to be 100% sure, is just a normal *** 6L80 or 6L90 flexplate from a car or truck. I do not think there is a difference in the bellhousings between a car or truck 6spd trans.

randeez

Wasnt much help lol

I used TCI 399753 it works perfect.

my truck has a circle d converter (3 bolt) but it also worked with the stock flex plate