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Identify 1st vs 2nd gear synchros
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Author:  ofensus [ Sat Sep 05, 2015 12:05 am ]
Post subject:  Identify 1st vs 2nd gear synchros

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.

Author:  Dattman [ Sat Sep 05, 2015 4:35 am ]
Post subject:  Re: Identify 1st vs 2nd gear synchros

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.

Attachment:
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Please don't comment on this thread.

Author:  lukak [ Sat Sep 05, 2015 4:40 am ]
Post subject:  Re: Identify 1st vs 2nd gear synchros

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

Author:  ofensus [ Sat Sep 05, 2015 1:26 pm ]
Post subject:  Re: Identify 1st vs 2nd gear synchros

Thanks folks!

Author:  Mr Murf 59 [ Thu Sep 10, 2015 1:40 am ]
Post subject:  Re: Identify 1st vs 2nd gear synchros

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.

Author:  BlackEuropa [ Mon Sep 19, 2016 6:03 pm ]
Post subject:  Re: Identify 1st vs 2nd gear synchros

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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