lt1 t56 compaired to nv3500

[LOWnEASY]

I know, new guy here. have a reasonable question that Google couldn't help with.
I have a 95 rcsb Cheyenne. 350 with nv3500. Soon as taxes come in I'm swapping a 4.8 or 5.3, whichever I find cheapest. (I knkw its a swap question but Figured I would get more replies in here)

Hears my question.
I can bolt a lt1 t56 to my 350 TBI motor in place of the nv3500. I can also bolt my nv3500 to a 4.8 or 5.3 with the 4.8 5 speed fly wheel and a crank spacer.
Now i have search "lt1 t56 behind lsx" and comes up "can't happen with out changing input, face plate and bell housing.
So why is it a nv3500 from my 350 TBI motor bolt to a 4.8/5.3 but the lt1 that will also bolt to my 350 TBI motor won't bolt to a lsx?
Doesn't make since to me.... am I missing a piece to the "sacred" puzzle?
Thanks guys and I'm happy to be here!

[Blackpearl]

Sorry man, it's just the way it is. You have to convert it. It's been a year since i did my conversation and swap. I remember one of the input shafts being way longer. the throw out bearing is hydraulic and is bolted to the mid plate on the ls1 style. Lots of little things. Just do the conversion, bolt it in and be done. I can't remember all the details, but after i started putting things together, it made sense.

[LOWnEASY]

I understand the difference in the ls1/lt1 t56.
If I can bolt a lt1 in place of the nv3500 to my 350, direct bolt in nothing special at all, and bolt the same nv3500 to the 4.8 why can't the lt1 t56 do the same
Even a lot of people say " just buy a ls1 t56" but I can find the Lt version 4-500 cheaper

[Blackpearl]

Yeah, that's what i did, i used a 97 t56 and converted it. I picked it up for $900. Then the conversion cost about 500. I did however find an ls1 t56 on craigslist yesterday here for a thousand. But like i said, the way the clutch worked, i had to bolt the hydraulic stuff to the midplate. The lt1 t56 used a clutch fork.

[LOWnEASY]

I think when it comes time, I'm going to try the lt1 with lt1 fly wheel and crank spacer.
Here's what iv gathered.
For the lt1 t56 to work behind the tbi motor, I have to use the lt1 fly wheel. (Thicker fly wheel)
For the nv3500 to work behind the lsx, with my current fly wheel, I need a crank spacer (or a 4.8 fly wheel but that wont work with a lt1 t56)
So in "theory", with the lt1 fly wheel and the crank spacer it should put the input shaft at the right length/distance from the block.
If all that fails, send the fly wheel and crank spacer back and buy the rockland gear(?) lt1/ls1 conversion kit.

[Blackpearl]

Doesn't hurt to try, i was in a time crunch and didn't have time to screw around. As long as you have it in mind, it possibly won't work, you won't get mad when it doesn't. The other thing i just thought of, the pilot bearing and how far the input goes in, its not so much the flywheel spacing, but how the shaft sits in there, so pay attention to that. And yeah, i think i went through rockland gear and got my stuff, keep in mind too, the kit doesn't come with the bellhousing, that's separate and cost around 300 bucks.

[LOWnEASY]

I'll have all the time I need to do test fits and parts sourcing and any other problems that may a rouse.
I just can't think of any way it wouldn't work. Mabey my mind is set and I'm over looking somthing.
Also, if it doesn't work, then no foul or harm done. just simply do it the proven way and tell my self "quit being so damn cheap" lol

[LOWnEASY]

As for the pilot bearing, I believe that's were the crank spacer comes in and allows the same bearing that was used for the TBI motor, which also should be similar to the t56 bearing hence the lt1t56 can go in place of the nv3500 on the tbi so I can't think that won't let it work

[LOWnEASY]

Hmm, just though about the bolt patterns on the fly wheel and if there the same?

[Blackpearl]

You've got the right mind set. Mine is my daily driver, i had from end of the day, to the next morning. So had to be on point with no hang ups. Btw, pilot bearing is the same, but how far the input shaft goes in depends on the bellhousing. Good luck man, you're in the right mind set.