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Username Post: differential whine        (Topic#360434)
george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-07-20 10:00 AM - Post#2790548    

Probably not the best forum, but the 4th gen forum is very slow.
Anyway, I have a 2002 Fbody and I upgraded from the factory 2.73 gears to a set of Yukon 3.23's. Now I have a whine at driving speed (40 - 50 mph) that is driving me crazy. Didn't whine before the upgrade. Had the work verified by a second shop and he said the install was correct. Additional info, when the gear swap was accomplished, I had a Summit cast aluminum differential cover installed ( it has two bolts that screw down on to the differential bearing housings to stiffen up/support the gears). All new bearings, including axle bearings. Any chance that the new cover is transmitting/amplifying some gear noise? Plan is to use a set of GM gears, this noise really resonates when I have my hearing aids on.



Edited by george88gta on 04-07-20 03:04 PM. Reason for edit: listed wrong manufacturer

 


5Larry7 
"16th Year" Gold Supporting Member
Posts: 2011
5Larry7
Loc: Dallas, TX
Reg: 05-17-04
04-07-20 01:02 PM - Post#2790561    
    In response to george88gta

Turn the radio up. Seriously, does it whine in cruise, or when accelerating or on coast. they all mean different things. From Google: A “whirring” noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. A “howl or whine” during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.

Check this out:

https://fuelandfriction.com/weekend-warrior/under s...


'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


 
Shepherd 
Frequent Contributor
Posts: 2065

Loc: Lake George, NY
Reg: 11-11-15
04-07-20 02:17 PM - Post#2790570    
    In response to 5Larry7

I've seen poor quality gears do this, but more likely an issue with tooth contact pattern, or pinion bearing preload, gotta get the cover off, driveshaft out and recheck everything.



 
george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-07-20 02:56 PM - Post#2790574    
    In response to 5Larry7

  • 5Larry7 Said:
Turn the radio up. Seriously, does it whine in cruise, or when accelerating or on coast. they all mean different things. From Google: A “whirring” noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. A “howl or whine” during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.

Check this out:

https://fuelandfriction.com/weekend-warrior/under s...



The noise is most pronounced when just cruising at moderate speed.



 
george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-07-20 03:03 PM - Post#2790575    
    In response to Shepherd

  • Shepherd Said:
I've seen poor quality gears do this, but more likely an issue with tooth contact pattern, or pinion bearing preload, gotta get the cover off, driveshaft out and recheck everything.


The gears were new from Yukon. Could be a bad set.The 2nd mechanic that checked the noise out said they were a bit noisey. I guess the problem for me is that the original gears were nice and quiet. Two things happened at once. New Yukon gears and the cast aluminum cover. Just wanted to to see if they were related. When this quarantine is over, car is going in to the shop for a set of GM gears and all new bearings ( again). Could be that I am too critical, but it is just the right frequency that it bugs me. Dont have any of the correct tools and know how to mess with this, best if I take it to the shop.



Edited by george88gta on 04-07-20 03:09 PM. Reason for edit: No reason given.

 
paulo57509 
Senior Member
Posts: 444

Loc: Tracy, CA
Reg: 07-18-00
04-07-20 05:44 PM - Post#2790586    
    In response to george88gta

Might be wise to not bring it to just any shop.

When I've had differential work in the past (other than removing the axles from C-Clip design), I'd bring the diff or the entire car to a drive line specialist.

Less headache for everyone involved.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 
1965C-10 
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1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
04-07-20 08:11 PM - Post#2790614    
    In response to george88gta

Over on Corvette Forum people talk about having their cars regeared to 4.10, on C5 Corvettes with T56 6 speed manual, I was considering it, 2 shops that are supposed to be the best, it's almost 2 grand to pull your diff and ship it to them.

Read lots of complaints of the new gears whining, and customers being blamed for driving car wrong, not breaking in properly, but it seems most whine.

I decided with 3.42 rear gears from the factory, GM got it pretty good for performance and mpg, and no whining.

Can you find a factory rear end with gear ratio you like?



 
1965C-10 
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1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
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04-07-20 08:16 PM - Post#2790615    
    In response to 1965C-10

I don't know the F body stuff, but if they are like C5 Corvette, guys with automatic with 2.73 or the 3.15 "performance option" can buy rear end from wrecked C5 that had 6 speed T56 transmission, also it has been mentioned throwing in 3000 stall converter in at same time, really wakes up even stock LS1 cars.

Maybe rear end out of wrecked 6 speed Z28 or Trans Am, see what ratios they had.



 
1965C-10 
Very Senior Member
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1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
04-07-20 08:30 PM - Post#2790617    
    In response to 1965C-10

  • 1965C-10 Said:
I don't know the F body stuff, but if they are like C5 Corvette, guys with automatic with 2.73 or the 3.15 "performance option" can buy rear end from wrecked C5 that had 6 speed T56 transmission, also it has been mentioned throwing in 3000 stall converter in at same time, really wakes up even stock LS1 cars.

Maybe rear end out of wrecked 6 speed Z28 or Trans Am, see what ratios they had.



So at least on the LS1 era Camaro and Trans And, the 6 speed manual cars came factory with 3.42 gears.

If I were you I would get a 3.42 rear end complete, if it's stock should be quite, also give you a little more umpf, might lose a tiny bit of mpg, but it sounds fun.

Another thing I heard, at least in C5 Corvette with the 3.42 diff swapped into an automatic car, that automatic Corvette will outrun a 6 speed manual Corvette, or it will get up to speed quicker.

Usually the 6 speed C5 Corvette is quicker because the 3.42 gears, vs auto 2.73-3.15 gears.

Buy the 3.42 rear end from a wrecked F body, then sell your rear end to someone else and explain you don't like the gear whine, someone might not care.

In the end it could balance out and you get your money back on what you pay for the manual F body 3.42 rear end.




 
george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-09-20 10:17 AM - Post#2790720    
    In response to 1965C-10

OK, got my cars mixed up. We have two Fbodys, a 1999 and a 2002. The previous info I posted was for the wrong car. My 2002 has an Auburn Gear carrier and Motive Gears. I had some oil spill on my logbooks so the data was very hard to read. Anyway, as soon as the quarantine is lifted the 2002 will be heading to a reputable shop for a rebuild ( GM gears and all new bearings, including axle bearings).



 
1965C-10 
Very Senior Member
Posts: 7373
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
04-10-20 12:16 AM - Post#2790789    
    In response to george88gta

Check this out...

Due To The Size & Weight S/H Is Fixed At $250 Anywhere Within US 48 States Or Local Pickup From NY 14120 For FREE

Part description:

*Complete Rear Differential Axle Assy For Camaro SS Or Trans Am Firebird 3.42 gear

Brand:

*OEM

Remove from:

*2001 Camaro SS w manual 6-speed

Mileage:

*49K

Not sure how close that is, but could pick up and save on shipping?

https://www.ebay.com/itm/1998-02-LS1-Camar o-SS-Tra...





 
1965C-10 
Very Senior Member
Posts: 7373
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
04-10-20 12:36 AM - Post#2790790    
    In response to 1965C-10

There are others for less $, that was the first one I saw, and it's in New York, and low mileage.

Factory GM, 3.42 should give good performance and no gear whine, then sell your complete diff to recoup what this one cost.

Something to think about.



 
george88gta 
"16th Year" Silver Supporting Member
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george88gta
Loc: new york
Reg: 04-23-03
04-10-20 06:14 AM - Post#2790800    
    In response to 1965C-10

Thanks for going the extra mile on this. The part is about 6+ hours away and we are still under house arrest here. If I didnt already have all new parts and the PCM reprogrammed for the 3.23, this would be a viable option. Buying used parts is always a bit of a crapshoot.
Best plan is to stay with a local rebuild. If there are any problems, they can easily be resolved.
Thanks again.



 
YOUNG57 
Frequent Contributor
Posts: 1204

Loc: Tennessee
Reg: 12-06-10
04-10-20 07:33 AM - Post#2790806    
    In response to george88gta

"Best plan is to stay with a local rebuild. If there are any problems, they can easily be resolved."

Yeah, we see how that worked out.



 
george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-10-20 07:43 AM - Post#2790809    
    In response to YOUNG57

  • YOUNG57 Said:
"Best plan is to stay with a local rebuild. If there are any problems, they can easily be resolved."

Yeah, we see how that worked out.



Different shop, professional vs.a friend who was working out of his house.



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1245
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
04-14-20 05:13 PM - Post#2791162    
    In response to george88gta

So the 3.23 gears are new.
I will say put some miles on it,
It's possible you may need to put 100-500miles on the gears
To get them to quiet down. I would at least verify the oil level.
If not after 200-500 miles your suspicion may be correct.
I had a similar issue, it took a while then the noise was gone.
I thought I had gotten ripped off on the job, but all is good now.


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george88gta 
"16th Year" Silver Supporting Member
Posts: 2030
george88gta
Loc: new york
Reg: 04-23-03
04-15-20 08:24 AM - Post#2791199    
    In response to Bad56Sedan

  • Bad56Sedan Said:
So the 3.23 gears are new.
I will say put some miles on it,
It's possible you may need to put 100-500miles on the gears
To get them to quiet down. I would at least verify the oil level.
If not after 200-500 miles your suspicion may be correct.
I had a similar issue, it took a while then the noise was gone.
I thought I had gotten ripped off on the job, but all is good now.



Gears have over 6,000 miles and at least one gear oil change. I am guessing poorly cut gears or improper install.



 


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