Filed Syncro Teeth

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May 18, 2003 | 12:58 PM

Hershey

Thread Starter

Racer

Joined: Sep 2000

Posts: 355

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From: Valdosta Georgia

Filed Syncro Teeth

Helping a friend put together a 71 Z28 with LS6 and M21. In the trans, every other syncro tooth has been filed for drag racing. How will that effect driveability on the street? At lower RPM's will it grind when shifting gears? Thanks, Hershey :chevy

[Modified by Hershey, 12:59 PM 5/18/2003]

May 18, 2003 | 06:34 PM

redvetracr

Race Director

Joined: Aug 1999

Posts: 18,126

Likes: 174

From: WI

Re: Filed Syncro Teeth (Hershey)

Hershey,
That is known as a "crash box" shift it real fast up through the gears and it will probably be no problem BUT downshifting might be another matter.
...redvetracr

May 19, 2003 | 06:59 PM

arnold

Instructor

Joined: Sep 2001

Posts: 171

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Re: Filed Syncro Teeth (redvetracr)

Quote:

Hershey, that is known as a "crash box" shift it real fast up through the gears and it will probably be no problem BUT downshifting might be another matter.
...redvetracr

When I used to mod 4 speeds, I didn't find a need to grind every other tooth of the syncro rings. I could eliminate their function altogether while upshifting, yet retain their full use/function for downshifting by grinding the slots (for the dogs) so the synchro teeth lined up with the gear teeth. After this mod however, there no longer was such a thing as a (clean) 'granny' shift. The faster you shifted, the better it liked it.

May 20, 2003 | 04:25 PM

Hershey

Thread Starter

Racer

Joined: Sep 2000

Posts: 355

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From: Valdosta Georgia

Re: Filed Syncro Teeth (Hershey)

Thanks for the help guys. I had heard of this mod, but never actually experienced it. This is primaryly a street car, but may see a little action, so we needed to know how it would act on the street. Thanks for the help. Hershey :chevy

[Modified by Hershey, 4:26 PM 5/20/2003]

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