The dreaded 3.73 Gear whine...

[twistedneck]

I have the same thing, loud as hell, same speed range. its very annoying and it got way worse after I put on stiffer control arm bushings top and bottom. got louder still when I removed the 5lb weights from each side that are there for that very reason - to get rid of that resonance.

next step is changing down to a 3.31 gear hope that fixes the noise.

Forgot to mention that the dealer replaced the entire assembly bearings, pinion, everything and re-shimmed it again.. same thing.

 

[Funny5.0]

I have the 60-80 whine as well with my Ford Racing 3.73's. They were installed by a reputable shop. The gears were blamed in my case not the install but who really knows...
Anyway I've gotten used to it over time and rarely notice it anymore.

 

[03 DSG Snake]

How about a 60-80 whine that gets louder when getting OFF the gas and coasting?

 

[Funny5.0]

How about a 60-80 whine that gets louder when getting OFF the gas and coasting?

Actually that is exactly when mine makes the noise. I don't really hear anything when on the gas. Maybe a tiny bit around 80.

 

[twistedneck]

Actually that is exactly when mine makes the noise. I don't really hear anything when on the gas. Maybe a tiny bit around 80.

Me too noise goes away a little on the gas, sometimes gets loud coasting.. its just a loud noisy setup and if you have it you know it. the only way to change the harmonics is to use a different rear end housing, a torsen diff or equivalent, or change the ring and pinion, anything to alter that frequency resonance.

 

[last5liter]

Just recently had a shop install new motive (Italy made) 3.73 gears and a Tru-Trac diff ect. The only noise is get is under very light cruise. As soon as I apply a little throttle or coast the noise goes away. Is this indicative of a gear set-up issue? or is this due to the T-56 manual and also the rear control arms with heim style bushings?

 

[imeyers302]

Me too noise goes away a little on the gas, sometimes gets loud coasting.. its just a loud noisy setup and if you have it you know it. the only way to change the harmonics is to use a different rear end housing, a torsen diff or equivalent, or change the ring and pinion, anything to alter that frequency resonance.

I have the torsen with 3.73. Always had a slight whine on the highway also between 60-80. Since i changed the driveshaft to a dss carbon and changed the upper control arm it is a lot louder. Still only in the 60-80 range but with the windows closed it can get annoying. Windows down and i dont hear a thing.

 

[oldstv]

I had whine with 3:73, 3:55 and 3:15 when using the same shop to set up the gears. Took the car to another shop "Power By The Hour" with 3:15s and no more whine. Everything else was the same.

 

[Famine]

I had whine with 3:73, 3:55 and 3:15 when using the same shop to set up the gears. Took the car to another shop "Power By The Hour" with 3:15s and no more whine. Everything else was the same.

I will be going there soon for this and a 15 longblock.

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[oldstv]

If that bunch of stupids are still around. They are going to ride out the storm.
Not me!!

 

[MCBigDog]

Who makes the FRPP gearsets? Anybody know?

 

[gimmie11s]

I'm an Amsoil guy, and I'm here to tell you, Severe Gear 75W-140 isn't going to make a difference. If you want to quiet the rear gears, use this and never look back.

Red Line Heavy Shockproof

I didn't notice any difference in mpg efficiency or added sluggishness, but man were the gears so much quieter.

Quoting for future reference...

 

[twistedneck]

Quick update - I have now destroyed two 8.8 rear ends.. both had the horrid whine. the original 3.73 and a sealed GT used 3.55 version. I'm now upgrading to the M88 from Moser.. Eaton True Track, 33mm gun drilled splined axles, no more c-clip attachment, long studs.. 3.15 gears.

3.15 is needed if you plan on keeping the MT82 - mine has survived this long.. yea its loud too.

 

[gt5.0coyote]

I also have it. Changed the oil today with red line, added a thing of friction modifier, and changed the bearings and seals. Pinion angle is dead on-2 so that’s not an issue. Will post updates o see if the oil quiets it Down.


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