Opened up my gearbox after hardcore road racing on 800ft/lb tq engine.

[futurevr4man]

J, you gotta quit typing in black, I can't read it!!

[Rakuny]

J, you gotta quit typing in black, I can't read it!!

Highlight the text!

[striker2]

or go to the very bottom left of the page and select "light GTO" style from the drop down box.

[sergechronos]

J, you gotta quit typing in black, I can't read it!!

Reading is for rich people and totally overrated.

[J. Fast]

Functioning as intended.

[Chris@Rvengeperformance]

I really don't think heat or lubrication is much of a factor... They are supposed to be a press fit, and not move at all. I think because of the spiral wound design, with very thin material, they are flexing and getting work hardened under heavy use.

The repair I proposed above is very effective... I don't remember what brand or model trans I saw it done from the factory on, but it certainly made an impression when I attempted to disassemble it...

I grabbed an old 5 speed fork today and took some pics for a demonstration of what I'm talking about.

First the factory spiral wound pin. You'll want to drive it out:



Then enlarge the hole to 1/4":



Then install the 1/4" single wrap spring steel roll pin:



Then install a 5/32" pin inside that one:



You'll notice how the 5/32" pin is mushroomed after install.... That's because I had to beat the crap out of it to get it in. Obviously a press would be a better install tool, but I was simply trying to perform a demonstration.

This thing is not going anywhere... Ever... Just for giggles, I tried to take it back out. I broke my punch...

I know this is an old thread, but I have a box here that the roll pins have backed out of. When I install them I use loctite, but I'm not sure if that is enough for ones that have tried to walk out already. I'm thinking of taking this approach and wondering what you thought:

https://www.jackstransmissions.com/p...pra-v160-forks

[Chris@Rvengeperformance]

Did some research and the issue is finding the right size bolt. 1/4" leaves only .010" thread engagement, the hole is too big already. 5/6 or 8MM seems big enough to compromise the strength of the fork, so I'm not sure there is a solution. There exists such a thing as a 7mm bolt, but it is hard to come by, especially in high strength.

[2fnloud]

Did some research and the issue is finding the right size bolt. 1/4" leaves only .010" thread engagement, the hole is too big already. 5/6 or 8MM seems big enough to compromise the strength of the fork, so I'm not sure there is a solution. There exists such a thing as a 7mm bolt, but it is hard to come by, especially in high strength.

What thread pitch?

[Chris@Rvengeperformance]

What thread pitch?

1/4" neither fine or course has enough thread engagement

[2fnloud]

I thought you wanted M7 bolts?