Ferd 9 inch gear pattern

5one9

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Yes it looks very good. Did the other setups look distinctly different than this? With about a 0.020” shim and 0.008” backlash you should be able to hit the right pattern almost every time.

For what it’s worth I’ve set up hundreds of differentials of all makes including motorcycles, and never had a noisy gear set. I have however been in cars that howled so loud that it was deafening.
 

kzhurley

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1st setup was with a different gearset that turned out to have way too much runout. Sent them back to Richmond and they sent me a new set.


2nd setup was .029 shim/.008 backlash... With that setup, it had the correct pinion depth... Severe whine...

3rd setup was .020shim with .008 bl. Less whine but still not acceptible..

That picture is with a .026 shim and .008 backlash..

All of the setups have looked similar to that pattern. Like they all looked acceptible to me. Moving pinion in and out doesn't seem move the pattern around as much as I think it should. The gears are marked with 1.031 pinion depth and .008 backlash..
I expect a little whine since their aftermarket gears but what I'm getting isn't even acceptible..

Whats really confusing to me is that I've done quite a few gm rears, 7.5s,8.5s and 14bolts... And 0 issues... The ford 9 is supposed to be the easiest lol..
 

5one9

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Those patterns are very acceptable. I don’t understand what is causing the noise. Pinion bearing preload good?
 

kzhurley

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Those patterns are very acceptable. I don’t understand what is causing the noise. Pinion bearing preload good?
Thanks for the reply... What I dont get is how it can be .006 difference in pinion depth and still good pattern.. It whines on accel and decel and greater with speed... The pinion is set with about 20inlbs rotational tq
 

kzhurley

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Update: gears are still very noisy lol..

Going to order up another set soon.

Thanks for the help
 

5one9

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What ratio are you working with?
 

5one9

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I re-set up a set of used 1957 3.70 gears in my old truck a year ago. Center section that I used was different so I ran the pattern and re-shimmed. I did notice the pattern shift to what I considered good. They are very quiet.

Makes me wonder if your housing is bent. That will make the carrier bearings howl like crazy no matter what ratio.
 

Cadillac Kid 1

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Just to chime in here when I called Moser to ask them what I could do for the noise in the 9” I bought from them he suggested that I turn up the radio. Not helpful but with open headers the rear end is the quietest thing on the car.
Greg Surfas
 

kzhurley

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If love to be able to find a set of ford 3.70 gears used... But around here it seems like they must have made them out of gold... If even settle for some 3.50s if I could find a good used set.

It is a custom housing that I made and everything is good and straight... I think i just got a crap set of gears..
I expect some noise from aftermarket made in China gear set,but it is not "okay" or acceptable...
The car it is in has a very healthy big inch sbc with 4 inch exhaust and flowmaster 30 series muffler.. You definitely notice it above even the exhaust.
I will order up a new set soon and try my luck next set...
 

underdog

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There are a lot of posts on other forums about noisy Richmond gears. Just the way they're made I guess.
 

5one9

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How did this turn out?
 

kzhurley

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I havent made it back to this project yet. There's a bunch of projects ive been working on. I did buy another set of good used 3.89 gears and haven't installed them yet. I hope to get to,it soon. It's going to be getting cold here soon.
 

Cadillac Kid 1

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Yeah,
Yesterday cooled down to the low 90's here so I got another few miles towards breaking in my new 9 inch gears. While the rest of the country hibernates during the fall and winter we come alive down here in southern Texas.
Greg Surfas
 

5one9

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What vehicle(s) do you drive?
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Yeah,
Yesterday cooled down to the low 90's here so I got another few miles towards breaking in my new 9 inch gears. While the rest of the country hibernates during the fall and winter we come alive down here in southern Texas.
Greg Surfas
What ratio?
 
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