Loud Gear Whine with new gears

[ReconCmdr]

Just had my gears changed in my 1998 limited 4wd from 4.10 to 4.88 with trutrac LSD and have loud gear whine. Loud enough that you hear it clearly over my borla muffler not sure if thats common for new gears until they break in. Any ideas would be helpful.

Thanks

 

[Dous]

Do you know what gear was used? No aftermarket gear will be as quiet as OEM, but Nitro gets pretty close.

It could also be due to improper setup, did you trust the shop you went to?

 

[ReconCmdr]

I used yukon gears.....seemed like all the guys on here used them so I figured they would be good. I have never read about the Nitros. The guy I took it to my family has been going to him for years and swear by him. I didn't know if it was normal for there to be a loud whine during a break in/seating period?

 

[Dous]

There may be a touch more noise during break in, but it shouldn't really be anything you can hear from inside the cab. The Yukons are OK, and shouldn't be prone to making too much noise

 

[ReconCmdr]

It is considerably louder than that...you can clearly hear it in the cabin above the drone of my borla muffler even.

 

[ReconCmdr]

So my question is do I drive it and see if they seat in and it quiets down or take it back to be redone. Its a 3 hr drive home from where the work was done.

 

[98OzarksRunner]

I'd make sure it has oil in the diff (duh!). It sounds like it isn't set up right. If the pinion depth isn't correct it won't engage the ring correctly and make noise. Usually it will sound different when accelerating and decelerating.

 

[ReconCmdr]

I'd make sure it has oil in the diff (duh!). It sounds like it isn't set up right. If the pinion depth isn't correct it won't engage the ring correctly and make noise. Usually it will sound different when accelerating and decelerating.[/QUOTE

So if the pinion is not set correctly there will be a different sound between accelerating and decelerating?

Thanks for your help

 

[98OzarksRunner]

[
So if the pinion is not set correctly there will be a different sound between accelerating and decelerating?

Thanks for your help

Yes, usually it will sound a little different, and often when coasting with no load (in neutral) the whine will go away.

 

[ReconCmdr]

Yes, usually it will sound a little different, and often when coasting with no load (in neutral) the whine will go away.

I didn't notice any difference between accelerating and decelerating but I wasn't paying attn to that. What I did notice though is that when not under load the whine almost disappeared.

 

[BigBluePile]

Make sure the diff is full.

When I build diffs I run three drives, 10 miles, complete cool down after each. Change oil. Then 500 miles grandma driving it. Change oil.

In regards to your Truetrac, make sure you get basic gear oil, no slippery additives. Also, those run pretty silently, no noise.

 

[ReconCmdr]

Make sure the diff is full.

When I build diffs I run three drives, 10 miles, complete cool down after each. Change oil. Then 500 miles grandma driving it. Change oil.

In regards to your Truetrac, make sure you get basic gear oil, no slippery additives. Also, those run pretty silently, no noise.

Thanks BigBluePile, how difficult is it to change the diff oil front and rear?

 

[BigBluePile]

Very easy. Especially if you have a manual.

Or you can take it somewhere.

 

[ReconCmdr]

Very easy. Especially if you have a manual.

Or you can take it somewhere.

Its an automatic....

 

[BigBluePile]

Its an automatic....

Congratulations. I meant like a paper book with instructions in it, like a manual or FSM.

Lololol

 

[slapdappy]

Since you trust the mechanic call and ask him.

 

[vipergrhd]

Noisy Diff.

Did your mechanic did all the work or he just did the gear set up and you installed the 3rd member yourself? I have built a lot of diffs.on Jeep's and Dodges and the only way for you to have so much noise is a bad set up from the get go also check fluid level if you didn't do any work to it.Setting of the pinion depth and gear backlash is crucial and your final turning torque once everything is dialed in,at what speeds do you hear the noise?if you hear noises as soon as the vehicle is moving it could be a tight bearing or binding gears and if the noise is above 25 mph it could be your gears humming.I hope you find solution to your issue soon,let us know your findings.

 

[ReconCmdr]

congratulations. I meant like a paper book with instructions in it, like a manual or fsm.

Lololol :d

doh!!!

 

[ReconCmdr]

Did your mechanic did all the work or he just did the gear set up and you installed the 3rd member yourself? I have built a lot of diffs.on Jeep's and Dodges and the only way for you to have so much noise is a bad set up from the get go also check fluid level if you didn't do any work to it.Setting of the pinion depth and gear backlash is crucial and your final turning torque once everything is dialed in,at what speeds do you hear the noise?if you hear noises as soon as the vehicle is moving it could be a tight bearing or binding gears and if the noise is above 25 mph it could be your gears humming.I hope you find solution to your issue soon,let us know your findings.

Thats kinda what I expected...I will keep you guys posted.

Thanks

 

[jmildoc]

Hey man, I could show you how to change your gear oil, I have everything to do it, pick up some new crush washers for a few bucks and your flavor gear oil of choice and let me know when you wanna do it.