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Old 08-18-2019, 02:28 PM   #1
texmanmoore
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T56 in a c3 corvette figment issues and problems

I purchased a used 2006 gto t56 and the chance aftermarket weir adapter kit for clutch. When installed it does not center into the trans tunnel. Plus doesn’t fit into after market trans crossmember from G force model rcc3. Is this a common problem. And how to I correct it. I hate to start notching crossmember and trans tunnel to make it fit. Do I need to adjust engine motor mounts for figment. Is there a link or info you guys can share with me? Thanks for any feedback
Scott
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Old 09-13-2019, 11:11 PM   #2
zimmej51
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Quote:
Originally Posted by texmanmoore View Post
I purchased a used 2006 gto t56 and the chance aftermarket weir adapter kit for clutch. When installed it does not center into the trans tunnel. Plus doesn’t fit into after market trans crossmember from G force model rcc3. Is this a common problem. And how to I correct it. I hate to start notching crossmember and trans tunnel to make it fit. Do I need to adjust engine motor mounts for figment. Is there a link or info you guys can share with me? Thanks for any feedback
Scott

Hi Texmanmoore; I see nobody has posted anything to your question so I'll throw out a few things. You didn't mention if you are using a conventional SBC or have swapped in an LSx or something. Also don't know what year your Corvette is.



Anyway, I'll share a few dimensions and things I learned on my project. It is a 1981 with factory 4-speed. I have done a complete frame off resto mod with an LS3 and a T-56 6 speed. I didn't have too much trouble getting things to fit but fabrication was necessary.


In order to get the T-56 shifter to line up with the original shifter "hole" in the console here is the setup I used:


The distance from the engine block/bell housing parting line to the rear face of the motor mount should be 13-1/4 inches. Here's a picture:



Next, I used an American Powertrain White Lightning short throw shifter with a 2-1/4" offset arm. The part number is SHWL-20313. This shifter allows the shift lever to stick out of the stock console almost exactly where the stock one did. Another pic...






It was necessary to significantly modify the cross member to fit the T-56 rear mount. I am not familiar with the cross member you bought and don't know the reasons it won't fit. In any case, I originally meant to chop up the original cross member to use as a pattern for a complete new one. For a while I considered using it but in the end I elected to fabricate a complete new cross member, mostly to make room for a true dual exhaust and to SLIGHTLY relocate the parking brake pulley. Here are some pics of the modified old one and the fabricated new one.














You can see the old modified cross member in the background. If your car is an 80-82 it should fit. If you are interested in the old one I can send it to you for free if you will pay the shipping. It's in my way and I have no further use for it.


As far as the up/down position of the transmission tail shaft, refer to post #108 in my build thread. It will provide you with some idea of how to position the tailshaft and minimize driveline vibration.


Hope this helps, If you need more details please let us know the specifics of your car. Good Luck!
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