Tr6060 syncro keys adaptable to T56?
Thread Starter
Teching In
Joined: Oct 2007
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Tr6060 syncro keys adaptable to T56? Probably directed towards you rebuilders that have touched both, is there enough material, space, etc. to machine the t56 synchros to accept the tr6060 updated keys? Would it be worth the effort?
From pictures, the tr key teeth spacing that ride on the inner synchro collar, appear different between the 1/2, 3/4 & 5/6, rev synchros in both count & size. The later pair appear to have course teeth that may correspond to the t56 tooth count/size?
Any of you mad scientist tinkerer types (85MikeTPI) considered this or pulled it off?
From pictures, the tr key teeth spacing that ride on the inner synchro collar, appear different between the 1/2, 3/4 & 5/6, rev synchros in both count & size. The later pair appear to have course teeth that may correspond to the t56 tooth count/size?
Any of you mad scientist tinkerer types (85MikeTPI) considered this or pulled it off?
An M12 box with pump and shift-related parts upgrades is on my bench. 
Yes, the synchronization teeth that mesh the slider to the gear are a mis-match in count, profile, ring diameter.
In short, you'd have more custom pieces than it would be worth.
There are multiple pieces to the shift linkage that relate to how shifts feel outside of the synchronizer keys. Implementation of the TR6060-utlilized parts began in the CTS-V.
Yes, the synchronization teeth that mesh the slider to the gear are a mis-match in count, profile, ring diameter.
In short, you'd have more custom pieces than it would be worth.
There are multiple pieces to the shift linkage that relate to how shifts feel outside of the synchronizer keys. Implementation of the TR6060-utlilized parts began in the CTS-V.
Thread Starter
Teching In
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My consideration of the swap was more for durability than feel, with the small side benefit of reduce component count.
The t56 design just always seemed like a clunky, unrefined approach.
It seems to me shift quality would be more dependent on the front offset lever/shift detent assembly interaction, and to a lesser extent the offset lever detent ball/guide plate pockets.
Thanks for your input
The t56 design just always seemed like a clunky, unrefined approach.
It seems to me shift quality would be more dependent on the front offset lever/shift detent assembly interaction, and to a lesser extent the offset lever detent ball/guide plate pockets.
Thanks for your input
TECH Apprentice
Joined: Sep 2014
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From: Merica
Completely different design. The keys on the T56 actually retain the synchronizer ring into place whereas they merely provide a detent pressure in the TR6060 thus the reason they don't get torn up even though they are made of plastic.
Thread Starter
Teching In
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Please expand on this statement, "The keys on the T56 actually retain the synchronizer ring into place whereas they merely provide a detent pressure in the TR6060".
If you're meaning rotational indexing, the synchro hub/collar cogs would be responsible for that?
Seems they both serve as just detent pressure, just two different approaches
If you're meaning rotational indexing, the synchro hub/collar cogs would be responsible for that?
Seems they both serve as just detent pressure, just two different approaches
Thread Starter
Teching In
Joined: Oct 2007
Posts: 25
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What's the consensus on the root cause of failure of stock t56 keys?
Fatigue, whether spring tension or key material.
Aggressive shifting.
Worn/broken shift pads.
Excessive synchro hub/collar clearance.
Clutch drag (not fully disengaging-failing hydrs.).
All the above?
Fatigue, whether spring tension or key material.
Aggressive shifting.
Worn/broken shift pads.
Excessive synchro hub/collar clearance.
Clutch drag (not fully disengaging-failing hydrs.).
All the above?
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