Originally Posted by glassman (Post 506127)

I converted my T-56 from an LT1 version to an LS version, There is a kit i bought from a company back east (Rockford i believe), bout 400$, includes a new input shaft, shims, and front "collar" which you'll need. I saw an article about this, either popular hot rodding or chevy hi-performance, which is why i did it...

http://www.gmhightechperformance.com...on_conversion/

I'm pretty sure if you have an t56 behind the bbc you'll need a different input shaft (as the final length is different) and collar, the lt1 tranny bolts up to a sbc, and the bolt pattern is the same for a bbc. You'll also need to confirm your bellhousing (you'll need an ls one obviously)

Originally Posted by Che70velle (Post 506364)

So the t56 magnums have a different input shaft length than the std, t56?

Originally Posted by Mkelcy (Post 506383)

There are two "standard" older T56's for Chevy's - the LT1 T56 and the LS1/Magnum T56. The LT1 T56's have about a 5.5" input shaft - engine to bell housing to bell housing to transmission mounting surface; the LS1/Magnum's have about a 6.5" input shaft measured the same way. The Magnum should bolt right up to an LSx engine with the right bell housing and pilot bushing.

Originally Posted by Che70velle (Post 506403)

You are correct. The lt-1 t56 will bolt up to a sbc, or a bbc, with no problems.
The LS-1 t56 won't bolt up to a sbc, so I'm guessing the op has a t56 magnum built for a sbc/bbc application, which as you stated, has a shorter input shaft. I know that I had to convert mine over.

Originally Posted by MaxHarvard (Post 506363)

I'm glad everyone didn't think my article was pointless. I got a lot of flak on that article for some reason.

Originally Posted by glassman (Post 506422)

You mighta got some flak for that, but out here in Kali, your secrets out. The guy i sold my zz3 to bought an LT t-56 and i couldn't be happier as I had my t-56 "magnumed" rebuilt right before my LS conversion and i was sooo relieved when i found out i could do this ( i was afraid i was going to be out another 1600)

So ya, thanks for that article. Watched your blue hour build too, absolutely love your car....

back on topic,,,,sorry for the diversion......Mike

Originally Posted by Che70velle (Post 506403)

You are correct. The lt-1 t56 will bolt up to a sbc, or a bbc, with no problems.
The LS-1 t56 won't bolt up to a sbc, so I'm guessing the op has a t56 magnum built for a sbc/bbc application, which as you stated, has a shorter input shaft. I know that I had to convert mine over.

Originally Posted by Mkelcy (Post 506407)

No. The LS1/Magnum T56 has a roughly 6.5' input shaft which will work just fine with an LSx engine, given the correct bell housing.

Originally Posted by Mkelcy (Post 506454)

An LS1 T56 will bolt up just fine to a SBC/BBC with a 0.5" thick mounting/adapter plate and the original Muncie type bell housing and mechanical clutch linkage. You can skip the adapter plate if you use a hydraulic clutch linkage and a T56 specific bell housing for the SBC/BBC.