Swapped to 3.92 gears. Now having whining from rear end

[Joven Baker]

I have a Ram 1500 2wd that came with 3.21 gears. Recently swapped them out for 3.92 gears. Since I have swapped them out, I have a whining noise coming from my rear end. Only happens when I accelerate. Anyone have any knowledge on what the whining noise is?

Thank you

 

[Ohio5pt7]

Gears arent set properly at least that's typically the reason. Are they new? Oem? Some aftermarket gears are just loud.

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[Joven Baker]

They are brand new made by transamerican.

 

[69GWC]

If they are not set up right you can get a whine for sure. Not a easy task really.

 

[Ohio5pt7]

They are brand new made by transamerican.

I would look onto seeing if anyone else has that issue with that brand. Example motive 4.30s for the gm products tend to whine. Otherwise they arent set properly which like mentioned is highly possible.

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[chri5k]

Here is a good primer on the steps to set pinion depth and backlash. Good chart showing proper marking compound traces.

https://www.racingjunk.com/news/how-to-set-up-your-rear-gear-correctly/

 

[Joven Baker]

The reputable mechanic here in my town say it could be from it being new. Told me to drive it a couple hundred miles and bring it back to him if it continues. I don't know if that is a good idea or not.

Thank you all for the help.

 

[Ohio5pt7]

If he stands behind his work nothing to lose but it's not because they are new if they whine now they always will. There is a reason your new truck didnt whine from the factory.

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[Joven Baker]

He has a 12 month, 10k mile warranty on parts and labor. Which it also stars on the receipt. I will be going down that route to figure out the issue. I appreciate your insight!

 

[smiley]

In my experience which you can read about here when I went to 4.56 in my 09. If they whine they won’t get better. They are either not set right or sometimes they are set right but bad gears. They were bad from new. He did them again and they were no issue. He says sometimes it happens.

 

[Clark Kent]

From what I read and not from extensive experience. Whine on acceleration is likely too shallow of a pinion depth.

 

[Ludville1]

In my experience which you can read about here when I went to 4.56 in my 09. If they whine they won’t get better. They are either not set right or sometimes they are set right but bad gears. They were bad from new. He did them again and they were no issue. He says sometimes it happens.

When you went to 4.56 gears in your 09, what gears did you have before? Was it worth it? Thanks.

 

[seabrook]

Big question is did you notice a huge performance game with those gears?

 

[Mark2011hemi]

Canadian mopar tech here sounds to me its not set up properly or bad pinion bearing off the bat. Set up many and have never had a break in whinning noise. The gentleman that set it up should take cover off and double check clearances and lash. Somethings not right in there.there is a paste you can use to check contact pattern on the gears. Good luck

 

[Tach_tech]

I’ve never heard of a gear whine fixing itself due to “break in”. It won’t get better over time. I’ve set up a ton of 9.25 rear ends and if they whine on acceleration it’s either not set up right, or a bad pinion bearing.

 

[CheechDogg.0n37s]

Yeah what Tach_Tech said ... you should take it back right away and have him check them out ... I had 4.88s by revolution installed and haven't had any whining to this day .... no reason to echo what others have said already .... have him check them out

 

[Joven Baker]

I wanted to say thank you guys for your help! The shop took care of it. Got new set of gears. It runs great now!

 

[RedSRT4Me]

I wanted to say thank you guys for your help! The shop took care of it. Got new set of gears. It runs great now!

Did they give you any details on what happen the first time??

 

[Joven Baker]

Said it was a bad set of gears.