T56 Input Shaft length question
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T56 Input Shaft length question I have a T56 that has a 2.97 first gear, so I ordered an LS input shaft for that gear ratio. The problem that I see is that the 2.97 input shaft is about 9/16" longer than an LS 2.66 input shaft. The transmission shop is telling me that it is the correct input shaft. Is there any pilot bearing or bellhousing combination that will work with the loner shaft? The transmission will be bolted to an LQ4. Appreciate any advice.
I might be wrong but.. I believe the longer shaft uses the smaller pilot bearing (i.e. fbody bearing) and the shorter shaft is meant for cars that use the larger pilot bearing. So if you have the shorter shaft, use the big bearing.
Your T56 must be from a GTO. The GTO used the same pilot bearing as the F-bodies (small bearing).
I don't understand how the new input shaft is longer but the shop is telling you it is the right one. They may have accidentally ordered a Mustang T56 input shaft and not one for a GTO.
Andrew
I don't understand how the new input shaft is longer but the shop is telling you it is the right one. They may have accidentally ordered a Mustang T56 input shaft and not one for a GTO.
Andrew
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They are both LS input shafts based on the pilot bearing diameter (0.590), just trying to figure out why a 2.97 ratio shaft would be longer than a 2.66 ratio, and if it will indeed work. My fear is that if I put this all together the shaft will be too long and I won't be able to bolt up the bell housing.
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Well it's kind of been bastardized, started out as an after market ford I believe, that was converted to LT1 I think. I was going to try to use it on an LS, but its looking like even the transmission specialists don't even know how or if it can be done.
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As it is, even with both input shafts, I'm into to it for less than the cheapest used LS T56 I could find. If I have to throw any more money at it I'm likely going to send everything back and buy a Magnum.
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A gto t56 bell housing is 5 1/2" front to back. A cts-v t56 bell housing is approximately 5 7/8"- 6" so 3/8" to a 1/2" longer. I couldn't get a dead nuts measurement on the cts-v bell housing as it's on the tranny. I'd bet money you've got a main shaft meant for a cts-v t56.
What is the measurement on your bell housing? What area are you in? Would help in members here possibly knowing and or suggesting someone in your area that can help. Most typical transmission shops don't have a clue on compatibility of different parts on these trans.
Last edited by showdog75; May 27, 2019 at 09:14 AM.
And are we measuring by setting the shaft rear down on a table? The synchronization section adds "length" but not functional clutch drive spline/pilot length.
There's really too many combinations of parts the OP could be talking about.
Post pics w/ measurements or get very possibly wrong information, OP.
The maindrive (input) is shorter in a CTS-V than GTO. The bell is 7mm longer in a CTS-V than GTO.
And are we measuring by setting the shaft rear down on a table? The synchronization section adds "length" but not functional clutch drive spline/pilot length.
There's really too many combinations of parts the OP could be talking about.
Post pics w/ measurements or get very possibly wrong information, OP.
And are we measuring by setting the shaft rear down on a table? The synchronization section adds "length" but not functional clutch drive spline/pilot length.
There's really too many combinations of parts the OP could be talking about.
Post pics w/ measurements or get very possibly wrong information, OP.
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The maindrive (input) is shorter in a CTS-V than GTO. The bell is 7mm longer in a CTS-V than GTO.
And are we measuring by setting the shaft rear down on a table? The synchronization section adds "length" but not functional clutch drive spline/pilot length.
There's really too many combinations of parts the OP could be talking about.
Post pics w/ measurements or get very possibly wrong information, OP.
And are we measuring by setting the shaft rear down on a table? The synchronization section adds "length" but not functional clutch drive spline/pilot length.
There's really too many combinations of parts the OP could be talking about.
Post pics w/ measurements or get very possibly wrong information, OP.