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71C Identification


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#1 Z.

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Posted 12 January 2014 - 08:13 PM

just wondering if anyone on here knows how to identify the various (3 I believe) types of 71C gearboxes?

I grabbed a 71c off a bloke for my manual conversion and I am halfway through rebuilding it however to order a rebuild kit I need to know exactly what car it was out of to start as there's some differences internally. Unfortunately the guy couldn't tell me what it was off originally but thinks it was an 89 silvia.


Some of the online stores were mentioning the difference being the 2nd and 3rd synchro's being one or two piece? I have no idea what this means though because all synchro's I've ever seen are just a single ring.

Any help would be greatly appreciated!! :/ I can post pictures if it will help

#2 Gareth. J.

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Posted 12 January 2014 - 08:26 PM

I got all my syncro and bearings through stewart Wilkins, he was very helpful with working out what specific kit I needed. I had an RB20det box which had double syncro on 2nd & 3rd. These are an inner and outer brass syncro with the steel cone floating in between the two. you can't see the inner syncro until you have separated the gear set. He got me to measure the gap to confirm the syncro type required.  see pic

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#3 dat2kman

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Posted 12 January 2014 - 10:26 PM

The ones that go through me, i mark on the centreplate a code, and keep a note as to what it came out of.
There are three different types of internals, over the 6 common various model cars.

Also various lengths to the extension housings, and layout of bolts holding the shifter plate down.
IMO the better box is the 71C from the S14 model Silvia's, but this needs the tailshaft in a S30 shortened by 50mm.

Some RB20det engined cars had two types of internals.

#4 Z.

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Posted 13 January 2014 - 12:09 PM

Thanks for the help fella's!

How much did that set you back Gareth if you don't mind me asking? I had a look on his site but I couldnt see the syncro pricing only the bearing and seals

#5 Gareth. J.

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Posted 13 January 2014 - 03:50 PM

I can't remember the specific prices anymore, I do remember the double syncros were cheaper than the singles which seems odd.




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