Noisy 3rd Member

[oleyeller]

Nine inch noise seems to be a controversial issue. I have been told: All 9" rears with aftermarket gears make noise. Only Ford OE gears run quiet. You have to buy NASCAR polished gears to get quiet ones. All gears are now made in China and none of them are any good. You have to buy the really expensive gears to get quiet ones......
I found a place called Johns Industries http://www.johnsindustries.com They seem to be able to build a differential that is quiet, at least they say they can. Helical gears should not make noise if properly set up, in my opinion. I was looking at a thread the other day and somebody was showing off a new Currie 9" rear and the gear pattern was showing in the picture, the pattern was way off to the bottom of the teeth. I trust Moser and Strange and Currie to set up a rear end that will work. But they may not be "perfect". I bought a Moser 12 bolt and the Instructions said the gears would be noisy, and they were, but not that bad. Maybe it is the quality of aftermarket parts....I got a nine inch off Craigslist here in town, built by a rear end shop here, it's horribly noisy, then I found out what kind of quality work they do, HORRIBLE business. I am going to pull the pumpkin and look at the pattern to see how far off it is. If it looks good, I have a set of Ford OE gears I may try. I built lots of rear ends that didn't make noise, but they were all GM. We ran 9" in drag cars, and I guess never heard the noise. Jury is still out in this debate. But I do know there are a lot of engineering experts on the internet.

[Alponcho]

Can you pm me the name of the business who built your 9"? I'm in the Phoenix area and need some work done. I've already made an expensive mistake with one diff shop here in town and want to avoid another.

[badazz81z28]

Can you pm me the name of the business who built your 9"? I'm in the Phoenix area and need some work done. I've already made an expensive mistake with one diff shop here in town and want to avoid another.

Moser

[lobudget]

Nine inch noise seems to be a controversial issue. I have been told: All 9" rears with aftermarket gears make noise. Only Ford OE gears run quiet. You have to buy NASCAR polished gears to get quiet ones. All gears are now made in China and none of them are any good. You have to buy the really expensive gears to get quiet ones......
I found a place called Johns Industries http://www.johnsindustries.com They seem to be able to build a differential that is quiet, at least they say they can. Helical gears should not make noise if properly set up, in my opinion. I was looking at a thread the other day and somebody was showing off a new Currie 9" rear and the gear pattern was showing in the picture, the pattern was way off to the bottom of the teeth. I trust Moser and Strange and Currie to set up a rear end that will work. But they may not be "perfect". I bought a Moser 12 bolt and the Instructions said the gears would be noisy, and they were, but not that bad. Maybe it is the quality of aftermarket parts....I got a nine inch off Craigslist here in town, built by a rear end shop here, it's horribly noisy, then I found out what kind of quality work they do, HORRIBLE business. I am going to pull the pumpkin and look at the pattern to see how far off it is. If it looks good, I have a set of Ford OE gears I may try. I built lots of rear ends that didn't make noise, but they were all GM. We ran 9" in drag cars, and I guess never heard the noise. Jury is still out in this debate. But I do know there are a lot of engineering experts on the internet.

FWIW I have one set up from Johns but have not driven it yet. Friends who have dealt with them more speak highly of them.