I just finished converting my old LT1 transmission to work with my LS1. As usual the differences were the bell housing, the clutch set up, input shaft, and front cover. The LT1/Borg Warner rear half is the same exact as the LS1/Tremec t56. The LS1 transmission which i bought complete was totally worn out. I had to use the rear half of my LT1 t56 mated with the front cover and input shaft to make a complete good working ls1 t56.

i snapped some pictures of the swap, as some may already know the ls1 input shaft is of a different length approximatly 1" longet than lt1.

On a side note i also swapped bearing outer races to keep the bearings true to the trans.

 

When you swaped the covers / front adapters & bearing races ,you should have set the end plays. This is a shimming operation behind the front bearing races. Preload will kill the bearings and too loose will cause a whole wealth of problems. You may have lucked out and got an acceptable result but these things are best NOT left to chance.

 

I did match up the outer race depth from the lt1 and shimmed the ls1 front to have the same depth. it is the same as it was on the lt1 cover.

 

Hey man do you know anywhere where I can find a new LS1 style input shaft and front cover and bellhousing? I have an LT1 style T56 and an LS1 engine and I need to do the same thing you did just I don't have an LS style tranny to grab parts from. Thanks.

 

What about the pocket bearing depth between the mainshaft and input? You can't just match outer depths and get a true end-play.

Hope it works out for you, but to save any others the grief, it should be noted how to do the swap properly..

 

D&D Sells them all

http://www.ddperformance.com/T-56%20Parts.htm

 

Sweet thanks man!

 

How much did the conversion cost?

 

How much skill is involved in this swap? My skills are decent, but I've never gone into a tranny. I wanna keep costs down, but dont wanna turn my t-56 to junk either.

 

what about the crossmember, did you change it to LS1 style?!
if yes, from where and what part # ?

 

^^The T56 mounting point never changed between the two, an LT1 T56 mounts in the same spot as an LS1 T56, so the Cross Member will never change unless he gets a '98 and up F-body.

I'm putting a T56 behind my 402 LQ4 Stroker, and I'm using the LT1 T56 Crossmember without a problem.

 

Do you know the part# of LS1 style T56, i need to get one fro my TH400 swap in 99 Z.

Any body know the part # ?

Thanks in advance, and Sorry for the thread hijack

 

i kinda took my car to a shop guy didn't want to get in to ding the job but already pulled my tranny and switched the bell housings and figured he was done, i went ahead and put it in, well drove about three blocks and floored it and well peddle went to the floor.. broke the throw out bearing... so thanks to you actually knowing what your doing helped me out a lot!

 

Ok....I don't know how this post connects to the '08 original.

 

subcribed to save for future info . tks

 

Can the front cover and input shaft, bearings, bell housing be replaced by bolt on? I am about to install LT1 T56 in LS1 now.

 

Yes it can be done. That is what I did here. Ran it that way for a year or so. Rebuilt later on due to syncronizer wear. There was a shim under the input bearing race that was installed to give the correct preload when originally assembled. Just swapping blind is not the best option but it can be done. Is it right? No. The right way is to tear it all down and have the bearing race and input gear set up properly.

 

After changing the MC and it took forever to get the clutch to bleed. Thinking something was wrong with the new MC I bought cause it took so long to bleed I finally got her done and she shifts just right!!