Final gear for s2000

[JAP-S2K]

An interesting piont that many miss when changing final drive gears in your diff is, due to the change in ratio, tail shaft speeds are more excessive and generally(not always) you'll get a light hum and/or vibration(not from driveshaft). So while your getting your gears done it's worth getting your tailshaft overhauled and balanced. Also changing final drive in gearbox is not a complex job at all, it's quite basic and theres less chance of ending up with a noisy gearset.

[Simy]

is cryo treated a must? what would you rate it out of 10 for importance?

[JAP-S2K]

is cryo treated a must? what would you rate it out of 10 for importance?

It's not a must. As it's got it's pro's and con's. It is a good idea as it make the surface harder and less likely to burr on the ends of the teeth. Which in theory does make it slightly stronger, but it also does make the teeth more brittle, which can/is a down fall. It really come's down to one important aspect..... how you drive your car. Nothing will stop breakages if your hard or have an abusive style of driving eg. launches, burnouts, doughnuts, clutch kicking and worse of all, if you let it tramp. Cryo treating could actually have a negative effect under these conditions. Remember that the factory crown and pinions wheels are renouned for snapping.

Are you hard on your car? or was the broken gearbox being unlucky.

[Simy]

lol.. i dont drive my car as hard as my mates.. they neva seem to break anything.. maybe its just the maintenence.. lol.. i think it was just unlucky.. i bought the car.. not in the best of condition, it had a history or blown diff and tail shaft... and i put the new clutch in.. n i think it was just time for it to go, couldn't hack the new clamp load...

[AusS2000]

Which in theory does make it slightly stronger, but it also does make the teeth more brittle

Cryo treating doesn't make material more brittle. It just removes faults int he lattice structure and makes the material more evenly hard, not harder.

[JAP-S2K]

Aus, your correct. My point, Cryo doesn't solve why they fail. Perhaps i should have explained myself a little more clearly. Doing Cryo treatment alone on the Crown and pinion wheels will have little, if any effect, as the cause the crown and pinion failure in our differentials goes way beyond the structural strength of the crown and pinion wheels (actual metal properties) themselves. Two keys area's seem to be the point where failure over time will occur. One being the diff collar (crush collar) and the other being the end caps which support the LSD centre. Both matters will result in excessive backlash, and overtime or through excessive abusive will cause failure to crown (more likely) and pinion (less likely) failure. Even then i know of a case where somebody managed to split a differential casing. If these area's are rectified to start with, perhaps we would see less failures. So what i'm trying to say is Cryo Treating may buy you time, much the same as spacers do for driveshafts. Your only fixing a known problem with a bandaid solution.

[AusS2000]

Maybe you should have said that instead of incorrectly stating that cryo treat makes the teeth more brittle.

[JAP-S2K]

My bad.

[Simy]

lol so angry guys.. lol cheers.. where could i get it done in sydney? pricing?

[JAP-S2K]

I don't get cranky! LOL

Pm sent.

[MBLAQ]

any1 know which place in Perth can do the install?

[jbird]

JAP, what's the go with the differential collar thing? I'm thinking of getting it and then getting my diff's backlash set. Worth it?

Not that keen on doing final gear, but want to do pre-emptive work on the diff for piece of mind.

any1 know which place in Perth can do the install?

Any differential place with a decent reputation.

Workshops with a reputation for building drift cars should also know what they are doing.

lol so angry guys.. lol cheers.. where could i get it done in sydney? pricing?

That's just Aus, he aint being angry and neither is JAP. His answers might be short but they are too the point and usually correct.