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Username Post: gear oil        (Topic#357443)
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-29-19 02:58 PM - Post#2771937    

Not trying to start an "oil war", but I do have a question. I am having the rear differential rebuilt. I presently have aftermarket "street gears" installed and it is too noisy for me. I have to wear hearing aids and between 40 -60 mph, the gear whine is excessive. Getting old sucks, but I hope you all get there. Anyway, the last time it was upgraded, I used an Auburn posi unit. No complaints. I have to purchase some gear oil since I am switching to a GM gear set to try and reduce the noise/whine. I have some redline on the shelf. OK to use or should I get some non-synthetic and the GM additive?



 


aghaga 
"4th Year" Silver Supporting Member
Posts: 2222
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
07-29-19 03:03 PM - Post#2771938    
    In response to george88gta

If you are getting that kind of noise either the setup is wrong or a bad cut on the gears. Lubricant brand won't quieten them.



 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-29-19 03:18 PM - Post#2771939    
    In response to aghaga

Best guess is that the gears are just "robust". Not just changing the oil, I am replacing the aftermarket gears with a GM set. Question was directed at which oil to use with an Auburn posi.



 
jdk 
"10th Year" Gold Supporting Member
Posts: 443
jdk
Age: 69
Loc: columbus, ohio
Reg: 02-15-10
07-29-19 03:24 PM - Post#2771940    
    In response to george88gta

get a couple gm additives in there and do some
figure 8's. jim



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2222
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
07-29-19 03:31 PM - Post#2771942    
    In response to george88gta

My bad, don't know how I missed that you were changing the bad set for a GM set. Auburn has a recommended friction modifier to add to the gear oils. Red Line is a very good lube but I don't know if it has a comparable additive already mixed in. Give the info on the container to a representative to find out.



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2222
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
07-29-19 03:34 PM - Post#2771943    
    In response to aghaga

I found this on another forum from Auburn:


"Good morning,

We do not suggest synthetic oils in our units for the very reason of the noise that you are getting in the rearend. Our recommendation is to use an OE 80/90 wt. oil with and OE additive.

Put in approximately 3 ozs. of additive for every quart of oil. Avoid synthetic oils and K & W brand of additives.

Let us know if we can further assist you. Have a great week!"

Hope this helps.




 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-29-19 03:39 PM - Post#2771944    
    In response to jdk

OK, lets try this again. The car is a survivor 2002 Trans Am convertible (non-WS-6).I am the second owner ( I have the original title and bill of sale). It is a rare color combo. No burnouts, no donuts nor figure 8's are going to happen. It deserves to be preserved. It is only a local cruiser. I changed the rear gears from 2.73 to 3.23 so it would be a better driver around town. Wont do that again. Switching back to the 2.73 would require a new posi unit, somewhat expensive.



 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-29-19 03:41 PM - Post#2771945    
    In response to aghaga

  • aghaga Said:
I found this on another forum from Auburn:


"Good morning,

We do not suggest synthetic oils in our units for the very reason of the noise that you are getting in the rearend. Our recommendation is to use an OE 80/90 wt. oil with and OE additive.

Put in approximately 3 ozs. of additive for every quart of oil. Avoid synthetic oils and K & W brand of additives.

Let us know if we can further assist you. Have a great week!"

Hope this helps.



Thats what I am looking for, some solid info. Off to NAPA and GM for the right oil and additives. Gas mileage isnt much of an issue since it rarely goes too far.



Edited by george88gta on 07-29-19 03:42 PM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 1850

Loc: Lake George, NY
Reg: 11-11-15
07-29-19 04:53 PM - Post#2771952    
    In response to george88gta

The correct suggestion to do figure 8's is done to get the lube into the posi clutches or cones.



 
IgnitionMan 
Valued Contributor
Posts: 3670

Reg: 04-15-05
07-29-19 06:24 PM - Post#2771959    
    In response to george88gta

The gear noise is from them not set up correctly, find another tech that knows how to do it right.

Then, NO SYNTHETIC SNAKE OILS , use a good natural gear oil, 85/90 weight, or, I prefer 90/140 weight, and the correct additive for the type diff it is, open, or posi-traction.



 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-30-19 04:15 AM - Post#2771981    
    In response to IgnitionMan

  • IgnitionMan Said:
The gear noise is from them not set up correctly, find another tech that knows how to do it right.

Then, NO SYNTHETIC SNAKE OILS , use a good natural gear oil, 85/90 weight, or, I prefer 90/140 weight, and the correct additive for the type diff it is, open, or posi-traction.



Thats the plan. We have a local tech, who worked for GM many years and decided to open his own shop. He has a great reputation for quality work. I used him in the past, only sorry I went with someone else for the first gear change.



 
IgnitionMan 
Valued Contributor
Posts: 3670

Reg: 04-15-05
07-30-19 04:24 AM - Post#2771982    
    In response to george88gta

Most gear noise is caused when the pinion depth isn't correct. When that happens, the ring gear doesn't sit correct, even if the back lash is correct. It is a delicate balancing act at very best, disaster when wrong.

Sounds like you are going to get it handled right, good for you, sir.



 
elcamino 
Dedicated Member
Posts: 5412
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
07-31-19 05:05 AM - Post#2772064    
    In response to IgnitionMan

A 75W-90 synthetic gear lube with limited slip additive will work. Anyone who recommends not using synthetic gear lube has no idea what modern synthetic oil is. GM has been factory filling rear differentials with 75W-90 synthetic gear lube since the early 1990's.

Synthetic oil base stocks are enigneered from synthetic hydrocarbons using a process that re-arranges the structure so all the molecules are uniform in size, shape and weight, a phenomenon that does not occur in nature. In contrast to petroleum oils which are pumped from the earth and refined. Synthetics are custom-designed to produce, in effect, the ideal lubricant.

Mike
2017 GMC Sierra Denali Ultimate 6.2L(420hp)/8-sp Z95
2018 Polaris RZR S 900 EPS


 
IgnitionMan 
Valued Contributor
Posts: 3670

Reg: 04-15-05
07-31-19 07:36 AM - Post#2772081    
    In response to elcamino

Oh, really? Then, why did I spend over 30 years fixing synthetic oils damage to early parts that did NOT have the correct metallurgy and/or hardness to use that junk.

A roller cam, induction hardened engine, or differential may well work just dandy with 0W-nothing synthetic "oil", but not an earlier part made out of silly putty metals.

After trying to work with Bel-Ray oil people trying to make their stuff work for over 5 years in components that had correctly hardened parts, and only finding bad results, we finally went back to natural oils, and the oil failures stopped.

So, you now see, I am not ignorant about today's snake oils, nor the metals they cause to fail. Next time you want to call someone as not knowing, learn what they do know....before proving you don't know them, nor their experience at all.






 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
07-31-19 10:42 AM - Post#2772094    
    In response to IgnitionMan

Directly from the Auburn Q+A section of their website:


"Q23. What kind of oil should be used with an Auburn limited-slip differential/ Auburn ECTED Max differential?
A23. Non-synthetic 80w90 GL-5 oil treated with Auburn Gear friction additive, part #504102 (also known as a friction modifier). See Catalog page 32. Three (3) ounces of additive will treat one quart of oil. GM or Ford limited-slip additive may be used. We do not recommend synthetic oil. Auburn limited-slip additive is packed in every box with the differential."

Since I have an Auburn unit installed, I will go with their recommendation.



 
IgnitionMan 
Valued Contributor
Posts: 3670

Reg: 04-15-05
07-31-19 03:49 PM - Post#2772117    
    In response to george88gta

Good, use what you wish, but, don't call anyone else dumb, idiot, moron, stupid, LIAR, nor that they don't have any knowledge of a subject, when they clearly do.



 
Rick_L 
Honored Member
Posts: 27651
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
07-31-19 07:17 PM - Post#2772132    
    In response to IgnitionMan

Just who said that to your sensitive ego? No one in this thread.

The recommendation he got from Auburn was the same as yours. Where's the beef?



 
65_Impala 
Very Senior Member
Posts: 4306

Reg: 12-29-02
08-01-19 05:52 PM - Post#2772197    
    In response to Rick_L

Because he's not happy unless he's beefing about anyone else's opinion to the point of posting silly BS to support his claims....

The auburn recommendation to use dino oil has nothing to do with the gears or bearings, since neither is part of the posi unit they sold. Those parts are always be better served by a good synthetic oil. They must believe the dino oil helps the clutches work better.



 
scrambldcj8 
Silver Supporting Member
Posts: 2492
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
08-03-19 05:31 PM - Post#2772340    
    In response to george88gta

  • george88gta Said:
Not trying to start an "oil war", but I do have a question. I am having the rear differential rebuilt. I presently have aftermarket "street gears" installed and it is too noisy for me. I have to wear hearing aids and between 40 -60 mph, the gear whine is excessive.



Is it noisy AFTER the rebuild or it has been noisy all along since a previous rebuild?

My brother didn't take my advice on a shop once and had it done at a lesser known shop....gear whine whine whine. Shop says let them break in....no dice!

Went to suggest shop....incorrect setup/install. Lesson learned.



 
george88gta 
"15th Year" Silver Supporting Member
Posts: 1984
george88gta
Loc: new york
Reg: 04-23-03
08-04-19 04:48 AM - Post#2772366    
    In response to scrambldcj8

  • scrambldcj8 Said:
  • george88gta Said:
Not trying to start an "oil war", but I do have a question. I am having the rear differential rebuilt. I presently have aftermarket "street gears" installed and it is too noisy for me. I have to wear hearing aids and between 40 -60 mph, the gear whine is excessive.



Is it noisy AFTER the rebuild or it has been noisy all along since a previous rebuild?

My brother didn't take my advice on a shop once and had it done at a lesser known shop....gear whine whine whine. Shop says let them break in....no dice!

Went to suggest shop....incorrect setup/install. Lessoned learned.



It had the orinal 2:73 gears when I purchased the car. They were nice and quiet, no whine. Since the car is basically a local cruiser, I thought that it would perform better with 3.23 gears. This resulted in a different posi unit, due to the gear ratio change. After market street gears installed and now whining. Could be incorrect install or type of gears or both. Can't go back to the 2.73 unless I want to spend the money on a new posi. I have a set of GM 3.23 gears and a reputable shop. So that is the plan. Hope it works out.




 


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