Educate me on 1*2 gearboxes

[dan112]

i was hoping someone in the know on these things could educate me on the gearbox diff circlip situation from what I know some boxes have a circip that can pop out and others have a bolt in plate is there any way of knowing without looking which one my car a 53 reg 172 cup would have and if it does have a circip is there anything to do in terms of driving style (I'm thinking especially track use) to try and minimise the risk of failure

 

[ed55j]

172 cup box has the circlip, it wont last long if you give it some abuse, well mine didnt anyway. You can replace it with a plate that bolts on.

 

[mark123]

My box has done 140k in my race car and has been abused for years and is still on the original oil. I've had no problems I wouldn't worry about it.

 

[Dan@SJM]

It's the wheel spinning that kills the circlips

 

[bozothenutter]

Any upgradrs possible on these boxes?
Have seen something called a bearing plate, and treated synchros and selector forks

 

[Greeny.]

Only a problem on 172's iirc? Mine went on the old 172 shortly after I got it, had it replaced for an hours labour using a guide posted by Matt Black I think and never had a problem after, although I didn't do any wheel spins, but that's probably because I wasn't 17.

 

[DaveDreads]

JC5 130 has the circlip bolted in place, JC5 129 and lower don't, being a cup your car is more than likely a 129,
the 130's are also non speedo drive so if your box is a 129 speedo drive you can't swap it for a 130.

 

[dan112]

Thanks for all the replies I'll make sure I tame my inner chav and avoid wheel spinning out of McDonald's drive throughs