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Underbody braces, turbos and more!

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PostPosted: Sat Sep 05, 2015 12:05 am 
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Location: SF Bay Area, CA, USA
Folks, going to be doing a transmission build, and got the rebuild kit.

Does anyone know how to identify which synchro is for 1st vs 2nd? They look fairly similar, but I can't tell if they're quite identical.

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PostPosted: Sat Sep 05, 2015 4:35 am 
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The kits are shipped with identical syncro's these days, originally first gear has a keyslot of 8.2mm/0.32 and 2nd has a 9.6mm/0.38 wide keyslot.

I'm sneaking a photo in here since photobucket has turned to custard.

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Last edited by Dattman on Fri Sep 29, 2017 7:06 pm, edited 1 time in total.

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PostPosted: Sat Sep 05, 2015 4:40 am 
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Dattman wrote:
The kits are shipped with identical syncro's these days, originally first gear has a keyslot of 8.2mm/0.32 and 2nd has a 9.6mm/0.38 wide keyslot.


hungary made "SGP" synhros are all 8.7mm


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PostPosted: Sat Sep 05, 2015 1:26 pm 
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Thanks folks!

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PostPosted: Thu Sep 10, 2015 1:40 am 
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If you want to apply just a bit more braking power to the 1/2 brass. You can use the springs from a T5 trans. Its a thicker gauge spring. They are just a bit longer. But you can trim them to size with a good set of dikes. It works great. It does wear them out just a bit faster, but your racing and don't want to get 100k miles out of them.


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PostPosted: Mon Sep 19, 2016 6:03 pm 
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Dattman wrote:
The kits are shipped with identical syncro's these days, originally first gear has a keyslot of 8.2mm/0.32 and 2nd has a 9.6mm/0.38 wide keyslot.



I just rebuilt a GT box using the Anaheim Gear bearing and seal kit which was all good Japanese bearings. But the Synchro kit I got separately from Ebay (different vendor) had identical 1 and 2 synchros. Within 20 shifts it was already grinding 2nd gear!

I had to pull the box, split it and press the counter shaft apart. I reused old 1 and 2 synchros from a low mileage JDM box and it works great now.

I STRONGLY urge people to try to find the correct 2nd gear synchro, unless you need the rebuilding practice.


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