I've done some research on the combo.. I can't see where it's ever been done. However, The transmissions behind an L28, KA24, and SR20 are supposed to be nearly identical minus the bellhousings.
Does anybody see any reason why an L28 transmission could not be bolted to an SR20DET, with an SR20 bellhousing and SR20 clutch? I'm not worried about durability, as the L28 trans *should* hold up to 300hp+ L28ETs. I am not planning on building a high hp SR20, at most 10psi of boost with stock ECU. It shouldn't see 250rwhp.(and if I add it up right 240rwtq).
I have seen where an SR20 transmission has been successfully bolted to an L28ET, I believe the only modification was a slight grinding on the order of a few thousandths somewhere, but i don't remember the details.
I have also seen where the KA24DE transmissions will bolt to an SR20DET, and the other way around with no modifications.
As far as I can tell, my idea SHOULD work. If not, let me know!
Thanks,
John.