LT1 T56 Transmission to LA 360 swap

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dukeboy_318 said:
You cannot mix and match just the input shafts. The bearings on the midplate that the input shafts ride on are different sizes. They’re very close visually, but the LT1 shaft is about an 1/8 inch thinner in diameter than an LS. The LS bearing is also a bit thicker than the LT1. Even though both are 31 tooth gears. You have to match the input to the midplate. you cannot put the LS input in the LT1 midplate. And you cannot put the LT input in the LS midplate. Not and have the bearings be correct or with issues with the bearing retainers as well as the play on the shaft. You’re gonna do more damage trying to hodge podge it.

Yes, you can convert an LT1 t56 to have an LS1 input shaft or even a viper input(assuming you also upgrade the counter shaft and main shaft) but you have to use the corresponding midplate . Unless you do some custom matching

Furthermore you have to make darn sure the LT1 t56 is a 31 tooth t56. Some, mostly 1993s and early 1994s were 29 tooth and youd have swap the entire gear set to swap it. As well as the main and counter shafts. And that’s expensively done.

You also have to watch the spline counts between some of the Fords. Most shared the 26 spline inputs but some, especially those in gt500s in certain years contained a 27 spline, 31 tooth input.
Corvette t56 t56s are an entirely different animal with their built in transaxle and stupidly long out put.
Click to expand...


That I didn’t know about the difference there with the LT and LS bearings.
Either way solvable either with machining or switching to both.
I have never wanted an LS or needed an Ls version of the trans so I didn’t dig that far in that direction.

I’ll measure everything closely on the cobra t56.
I’m dealing with an aftermarket input so Spline wise I’m not concerned as it’s 26 spline too.

I also was not aware of the 27/31 spline versions because the people I know with gt500 tr6060’s were all 26 spline as far as they told me (behind lightning 5.4’s)

I did know that the tr6060 stuff is magnum stuff but not interchangeable with older t56 stuff.

Good to see someone making use of the challenger tr6060’s.
Wonder if a Chevy LS input would switch into the challenger tr6060 to match it to those LS to mopar bellhousings from QuickTime etc.
 
To the OP, I'd forget that t56 and save for the new TKX five speed. Gonna be alot less of a headache. I have a new magnum and wish this had been out at the time I grabbed mine. I'd have been all over it.
 
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