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boss 302 373 gear wine

Old 5/13/19, 08:31 PM
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boss 302 373 gear wine

Just put QTP electric cutouts on this winter and now I really notice the rear end wine. Have about 9400 miles on it. I think it always wined, just didnt notice as much. Tried out 3 other Boss's before I purchased this, I thought they all had some wine at certain speeds, but probably didnt notice because I was so enamoured with the car and all of them had the cutouts open. I tried to figure out exactly when I hear the wine. I notice some about 35 or 40 mph. At 50 really noticable. I put the clutch in and I still hear it. My highway cruising speed is about 74 and very noticable, also when I put the clutch in at that speed it is gone or almost gone. Definitely noticable up to 85 and at 90, gone. I havent cruised consistantly at that speed or faster. First of all, does that sound excusively like the rear end? Second, many of the guys on the forums say that adding Fords anti friction to the rear end will cure it. Others have mentioned changing the backlash from 12 to 10 or getting a new ring gear and pinion. I have a 6 year 100,000 mile extended warranty from Ford, so I probably will go that route if necessary. Should I have Ford put in the ant friction first? All your help is appreciated.
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Old 5/14/19, 03:57 AM
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Don't mess with it and use your 6 year 100,000 mile warranty
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Old 5/14/19, 05:23 AM
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Thanks, but does that sound like its exclusively the rear end? Does it make a difference that the wine doesnt go away when I put the clutch in at lower speeds but seems to go away when I put the clutch in at higher speeds and why would it disappear at 90 mph? Thanks
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Old 5/14/19, 06:22 AM
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rear end gear whine can vary with load and speed . . . it is hard to sort out, but it could be loading and speed interacting to make it sound different when you disengage the clutch

impossible to say from here whether it is actually rear end whine or not, it's hard to tell for sure when driving in my own car, LOL

it should already have the appropriate friction modifier in it, and that is mainly for the limited slip to work correctly, so I very much doubt it would affect the whine . . . you have Torsen differential in the Boss so I'm not sure what is required for friction modifier . . . I don't think that would be the first thing that I would mess with

since you have the warranty, that would be a good place to start . . . but be prepared for the service manager to say they can't hear it, or it is "normal" . . . I think the only way to fix it is to replace the gear set, and even then it is hit or miss . . . some say they will not whine if properly set-up, some say some whine is inherent in the 3.73 gears and it varies from set to set how loud it is
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Old 5/14/19, 03:45 PM
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I thought I also had a rear whine problem but I replaced the stock Pirelli's with Michelin's and it went away.
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Old 5/15/19, 08:11 PM
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So you have a 2013 Boss also. How long did you have it and how many miles on when you changed the tires? Did they seem worn? So it may be that simple. One of the guys mentioned that I should let 6 lbs of pressure out in each tire and if that changes the wine then that would then be my tires. Maybe I will try that next. Did you happen to try that before you purchased the new tires? Did your rear end ever wine and how many miles on it now?
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Old 5/15/19, 08:21 PM
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Bought her brand new and never tried the air trick but noticed the whining around 8k. I replaced my tires (Pirelli's great grip for first 4k complete junk after that) at 15k due to the FRONTS failing inspection (yes I corner with her as she was made to do) and the whine was gone. I have 20k on her now and no whine.

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Old 6/8/19, 03:25 PM
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It's possible that the tires are causing the whine. More likely the ring & pinion gear lash was set incorrectly at the factory. Typically the whine happens when the the lash is set too loose. But wether it's set too loose or too tight, this will cause premature wear on the ring & pinion gears. The lash is the proper meshing of two gears together. Nearly every time I've encountered a rear gear whine, it will start at a certain speed, then gets louder as you go faster, while keeping the throttle fairly steady. It's much easier to hear a rear gear whine while driving over about 50mph in high gear (6th for a stick, and OD in an automatic).That helps you to hear the rear end, as opposed to tranny/engine/exhaust etc. My GT came with Pirelli P ZEROs. Happiest day of my life was taking them off to install a set of Michelin Pilot Super Sports. Quieter, handled much better on dry or wet roads. Oh yeah, rode better too. One other thing that might sound like a whine is a rear axle bearing going out. Hope this helps you while trying to isolate where the whine is coming from. I've never heard of letting air out of tires to see if it changes when a whine might occur. No logic to it. Tire tread design that whines, is gonna whine no matter the air pressure, high or low.
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Old 6/13/19, 06:30 AM
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My 2014 track pack with the same 3.73 torsen has that whine as well. At higher speeds it fades, but peaks right around 100-110 kph, which is highway driving up here in Canada.
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Old 6/14/19, 03:36 AM
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Originally Posted by lakeguy77 View Post
My 2014 track pack with the same 3.73 torsen has that whine as well. At higher speeds it fades, but peaks right around 100-110 kph, which is highway driving up here in Canada.
Ditto. My ‘14 Track Pack had the same issue between 60 and 70mph. It wasn’t super loud but you could hear it. Disappeared over 75mph.
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Old 6/14/19, 10:44 AM
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Gear whine doesn't really go away, you are speeds now where basically you are outrunning what you're hearing in the driver's seat. I would suspect that if you could sit in the trunk you'd still hear it. It's nothing terminal unless the gear lash is way off. That rarely happens anymore, as all of the factories are much better than in years past.
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