Yukon 3.75 gears for Ford 9 inch....noise - Page 3 - Hot Rod Forum : Hotrodders Bulletin Board
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  #31 (permalink)  
Old 02-26-2011, 08:21 PM
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I have been watching this thread for a bit.. sorry to be commenting so late your patern seems money and spot on. As for the noise......... some gears are just noisy. I had a set of yukons in a 9" under a 55 olds that I couldnt get to quiet down no matter how much I messed with them. They were loud but they worked great for a lot of years and were rock reliable. Instead of trying to make them quiet i should have just put some dynamat on the floors and turned up the radio Great gears but not allways quiet in my experience

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  #32 (permalink)  
Old 02-27-2011, 06:36 AM
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Quote:
Originally Posted by Onefunponcho
I have been watching this thread for a bit.. sorry to be commenting so late your patern seems money and spot on. As for the noise......... some gears are just noisy. I had a set of yukons in a 9" under a 55 olds that I couldnt get to quiet down no matter how much I messed with them. They were loud but they worked great for a lot of years and were rock reliable. Instead of trying to make them quiet i should have just put some dynamat on the floors and turned up the radio Great gears but not allways quiet in my experience

I am going to call Yukon and see if they will warenty them. If not I will have a set of 3.75 gears for sale.
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  #33 (permalink)  
Old 02-28-2011, 07:44 AM
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Well run the car on jack stands last night, good news and bad news. I still have gear noise. But, I dont think its coming from the rear end. I think its the T56. I can run it from 20 to 80 mph in 4th with no noise. As soon as i shift into 5th and do the same thing I start to get noise, then put it in 6th and it gets louder. Same mph in 4th no noise, same mph in 5th start to hear noise, same mph in 6th noise gets louder. The drive shaft is spinning the same speed at that mph no matter what gear I am in, just turning more engine RPM. So, looks like I might be learning how to rebuild a T56 transmission.

Going to drive it as soon as the monsoon lets up here....
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  #34 (permalink)  
Old 02-28-2011, 12:02 PM
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So do you think that all of the noise was coming from the transmission and the 3.75 wasn't causing it?
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  #35 (permalink)  
Old 02-28-2011, 02:39 PM
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Originally Posted by big gear head
So do you think that all of the noise was coming from the transmission and the 3.75 wasn't causing it?

Its starting to seem that way, how could it be the ring and pinion, it doesnt care what gear the tranny is in. It should make noise at the same speed all the time no matter what gear the car is in. Starts in 5th then gets worse in 6th at same speed? I am getting ready to go drive it and see.
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Old 02-28-2011, 07:04 PM
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Well drove the car and still have gear noise. It is coming from the rear end. The noise is better on the drive but now I have noise on the coast. The drive noise starts around 60 mph and comes on with any light throttle load. The wierd thing is when I am hard on it the noise goes away.

I guess I am just going to have live with it. I am getting tired of tearing it apart.

Is it possible its this aluminum case? I know Strange makes a light weight aluminum case that you are not supose to run on the street.
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  #37 (permalink)  
Old 02-28-2011, 09:23 PM
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All I can say is I'm glad it's not me trying to fix this. These things can drive you crazy sometimes. I think you have done all that you can do. Maybe try using the stock Ford case that you have and see if it makes any difference.
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  #38 (permalink)  
Old 03-01-2011, 08:37 AM
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Are you sure the pinion preload is correct?
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Old 03-01-2011, 09:39 AM
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Quote:
Originally Posted by lmsport
Are you sure the pinion preload is correct?
I am checking it with an inch pound tourque wrench. I have about 10 inch pounds on them right now. Since they have been ran.
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  #40 (permalink)  
Old 03-01-2011, 09:53 AM
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The gear pattern looks fine so I'm out of ideas. Maybe something about your axle configuration is amplifying a small amount of noise??? Do your axles slide in and out of the housing/diff fairly easily?
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Old 03-01-2011, 10:33 AM
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Quote:
Originally Posted by lmsport
The gear pattern looks fine so I'm out of ideas. Maybe something about your axle configuration is amplifying a small amount of noise??? Do your axles slide in and out of the housing/diff fairly easily?

Like butter.
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  #42 (permalink)  
Old 03-02-2011, 09:20 AM
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I am in the process of trying to get Yukon to warranty the 3.75 gear and replace it with a 3.70. I have sent them pictures of the pattern I had. We shall see what happens.
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  #43 (permalink)  
Old 03-02-2011, 12:17 PM
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Straight from Yukon rep....

My rep said, your pattern looks good.
Those gears have a potential to make slight noise.
The 3.70’s would be quiter ( none in stock anyway ), he said.
“ nature of the beast” those 375’s.


Well looks like I got screwed, anyone want a 3.75?
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  #44 (permalink)  
Old 03-02-2011, 12:44 PM
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Assuming set up is correct, gear noise is usually attributed to the math - basically theres a remainder in the division. If the teeth don't mesh quite right, noise is generated.

One of our competitors makes a similar gearset to one of ours, but they use a different tooth count that is cheaper and easier to produce. These gearsets run 'loose' and make a lot of noise, but work fine. They lose strength because of the vibration and heat buildup (wasted motion), but they're fine for street applications.

Moral of the story: It comes down to comfort...if you can deal with the noise, keep em, if not, my suggestion would be to source an OEM stock replacement in the ratio of your choice.
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Old 03-02-2011, 12:56 PM
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Quote:
Originally Posted by AutoGear
Assuming set up is correct, gear noise is usually attributed to the math - basically theres a remainder in the division. If the teeth don't mesh quite right, noise is generated.

One of our competitors makes a similar gearset to one of ours, but they use a different tooth count that is cheaper and easier to produce. These gearsets run 'loose' and make a lot of noise, but work fine. They lose strength because of the vibration and heat buildup (wasted motion), but they're fine for street applications.

Moral of the story: It comes down to comfort...if you can deal with the noise, keep em, if not, my suggestion would be to source an OEM stock replacement in the ratio of your choice.

Thats going to be hard to do since I have been told that Ford has not made ring and pinions for the 9 inch for over 25 years. Do you sell or make gears?
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