jonarotz

iTrader: (26)

Is this caused from too little backlash?

http://www.jons91z28.zoomshare.com/a...0068880/:album

Precision Trans

What's the actual backlash as measured with a dial or test indicator? If you can't tell me, then you are not properly equipped to handle working on gearsets and you should consult someone with experience. Best to spend a little money now on a professional, than alot more later if you ruin a gearset.

If you have any questions please do not hesitate to contact us

Don

jonarotz

iTrader: (26)

I set these gears up with .008" backlash, They have a few thousand iles on them. I just upgraded my posi carrier and noticed the pattern.

ede

.008 ought to be good, i always try for .008 to .006

Precision Trans

How does 0.008" compare with the manufacturers recommendation? I hope you didn't pick 0.008" arbitrarily, when setting the baclklash. You must bear in mind, that the tighter you set the backlash, the less room there is for lube when the gears are in mesh. U.S. Gear recommends 0.008" to 0.012" for their gearsets, and Ford Racing Recommends 0.008" to 0.015" with 0.012" to 0.015" preferred. Setting your backlash to the high side of the range will allow best lubrication without sacrificing gear life. If you have any further questions, please do not hesitate to contact us.

Don

jonarotz

iTrader: (26)

No I used the spec given by Richmond. I had it at .008 and this was the pattern on the pinion. I just thought it looked funny. The gears would whine on decel., now with the new zexel torsen I set the backlash at around .010. hopefully this will quiet them down. I was mostly curious if the backlash was too tight and if that was the source of my whine.

Precision Trans

Okay, now that I know the gear manufacturer, I may be able to help you track down your noise.

69 series Richmond gears are meant to be set up with the contact pattern biased towards the toe on the drive side and the centre of the tooth on the coast side. If you set the pinion depth so that the drive side pattern is central on the tooth, then the coast side will be biased towards the toe and your chances of a noise are greatly increased.

Remember, the pinion depth spec. painted or engraved on the end of the pinion is there for a reason. Use it, and you will have alot fewer problems.

In the case of an OEM gearset, you can usually use the original pinion depth shim FOR THE HSG. and set the backlash in the 0.008" to 0.012" range, and your pattern should be okay.

If you have any further questions please do not hesitate to contact us.

Don.