Hello,

already looking into the next big modification for the car, either forced induction or swapping over to an LS1.. A quick question for the LS1 folks..

Is the t56 from the LS1 the same overall length as the one from the LT1? I am pretty sure it is which would mean my conversion crossmember would work for either LT or LS engines and I would just need motor mounts..

Hypothetically speaking of course

 

ok, my information is based on what is the same.

if 82-02 driveshafts can be swapped and the position of the rear axle from 85-92 is the same as 93-97, and 93-97 share the same design as 98-02 and 82-02 share the same floor pan. I would hazzard a guess that the LS1 T-56 would be the same length as the LT1 version


(Also since I haven't measured it I could be all wrong.)

 

assuming you buy a LS1 + an LS1 t56, then everything will work fine. transmission crossmember and all.

if you try to use your LT1 t56 + a LS1, things won't bolt up

 

Same length, different input shaft splines, different type of yoke also. Other than that, same thing, LS1 T-56's being slightly weaker than the LT1 counterparts.

 

Now why would GM make a weaker Tranny for a stronger engine?

 

I honestly don't know, but its the truth, look it up for yourself.

 

This may explain it:

 

Interesting, but aren't both T56's rated at 450 lb-ft for torque capacity?

 

No, neither is. The viper T-56 is rated at 450 LB's I believe. Im not sure on the 94-97 T-56's or LS1 T-56's. I do hear stories from shop owners on camaroz28.com of people braking LS1 T-56's at a 10:1 ratio over the LT1 T-56's. As far as thier actual ratings, im not sure, the 93's were rated lowest.

 

Just found out the 94-97 and 93 G92 T-56's are rated to 400 lbs. The non G92 93 T-56's were rated 350 LB's.

 

Oh J', the Input shaft on the LS1 T-56's are 1.5" longer than the T-56 version. If your throwing in an LS1 to the LS1 t-56, there will be no problem. I have hear dthat you can swap the shaft though.

 

94-97 is rated at 450, 93 with 2.97 first gear is 400, 3.36 first gear 350 ft lbs.

 

Before swapping in the LS1, I was running an L98 with an LT1 T56 trans. Used the same Skulte Performance Designs T56 crossmember, same driveshaft also for both, no problems.

 

Thanks for the rapid response! Figured it would be the same, never hurts to ask though..

If I did it I would swap in a whole assy. LS1 plus t56.. then sell off the LT1, harness, t56 and associated goodies..

I am just tossing around the idea of going LS since if I do a forced induction LT it would cost about the same as a head cam LS swap.. Though I am not sure if it is worth the trouble after putting in so much effort into the LTX swap (just rebuilt my t56, added heads and cam) and with a bit more will be up in the H&C LS territory anyway..

 

Are you nuts ? You've already got the vette accessories, now add the BBSDesigns single turbo kit, and a water to air intercooler, one of the ptk kit equipped guys twisted 454 rwhp 567 rwtq on a STOCK LT1 with a T66 and 9 psi, yes some LS1's might be able to get that hp figure, but the torque and curve they arent going to be able to match, you've got a nice setup, dont go trading it for something that might work a little better when what you've got can be made to work far better.

 

AHA! a turbo kit.. been looking for one, do you have a link?

yep I am leaning more toward keeping it LT based thanks for the NUTs! input

EDIT: found the link, looks interesting, cheaper than the corvette vortech..

 

Since you've already got the link to the turbo

Add that with this intercooler http://66.70.20.245/store/scripts/pr...?idproduct=135

Where the battery normally mounts on the passenger side, a few other little items, and you'll be the new talk of the power adder forum, just sucks cause i was hoping to do it first

 

Interesting stuff,

Wouldn't air-to-air be a bit easier to run?

Second, the BBS stuff, looks a bit shaky, based in PRico and lots of small print on the kit, such as "not tested on angle-plug heads"

Not knocking it but do you know anyone running the kit??

You will still be the one to do it first, if I do this it will be on a fresh shortblock with a blower/turbo cam in it.. I still have a H&C swap to wear out first but may collect parts in the meantime..

Wait didn't I start this thread talking about transmissions??

 

Forgot about him not testing it on any angled plug heads yet, he just doesnt have extra heads laying around to test fit, a few people on the boards are running his kit, just none that i know of with an LT1, I believe SLP's have a disclaimer about angled plug heads, but we all know they clear LT1's fine, worst case scenario im prepared to go to the straight plug impala iron heads in order to run the turbo.

The air2water would be the easiest to plumb, effect your cooling efficiency the least, and fit the best, just 2 short boost pipes, a heat exchanger in front of the condenser, and a water pump for some flow.

 

alrighty, thanks for the info.. I am going to give this a serious look for my next build thanks!