Quiet Fluid
Quiet Fluid Torsen with 3.73 Motives. I finally bit the bullet and took my car to the shop to get the rear end set up. Everything was done right with the correct preload, pinion depth and backlash but it still has a little whine. Not during acceleration, not during deceleration but in between when there is just a little pressure on the pedal. I set the gears up myself before and ran them for about 8k and wasnt totally happy so I took it to a pro. They told me the pattern I had worn might make a slight whine, which it does. Will the new (correct) pattern wear in and quiet down or can I use some thicker fluid (75w-140) to quiet it or do I just deal with it?
If the pattern has been worn into the gear, its nearly impossible to get them to be quiet, Its just something you have to live with. To me it sounds like a minor problem.
My gearset was run for about 8k before I had it set up professionally and it has a slight whine. If it is truly set up correctly, can the old (wrong) pattern cause a little whine like that?
Originally Posted by BigJoeBob1
My gearset was run for about 8k before I had it set up professionally and it has a slight whine. If it is truly set up correctly, can the old (wrong) pattern cause a little whine like that?
Well for all who care, I got the car back from the shop and the finished product has .032" pinion shim, 18 inch lbs of pinion preload and backlash was set at .008". It has a slight whine in the 50-65mph range but not terrible. I might change the fluid to synthetic 75-90 with some additive or just put in some additive and leave it alone. I will just have to live with a little noise I guess. I haven't really gotten a straight answer if thicker fluid would help or hinder so I will stick with the regular stuff. You live and you learn I guess.
Originally Posted by BigJoeBob1
Well for all who care, I got the car back from the shop and the finished product has .032" pinion shim, 18 inch lbs of pinion preload and backlash was set at .008". It has a slight whine in the 50-65mph range but not terrible. I might change the fluid to synthetic 75-90 with some additive or just put in some additive and leave it alone. I will just have to live with a little noise I guess. I haven't really gotten a straight answer if thicker fluid would help or hinder so I will stick with the regular stuff. You live and you learn I guess.
Here is my current gear pattern. My backlash is a little tight at about .0045" averaged in three places.
Drive Side on the left, Coast Side on the right.
For comparison, here is the factory pattern which had a huge .013" back lash
Last edited by BJM; Apr 13, 2007 at 04:10 PM.
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What do you mean when you say "Do not discount the effects of the fluid regardless of what anyone says." I have found that gears are very tricky and if gears are run at a wrong pattern, the sound will never go away regardless of whether the new pattern is perfect. And I think .0045 on the backlash is a little tight and might get a little hot, that is very little room for the fluid to get in there. Just my humble opinion from the info that I have gathered.
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Originally Posted by BigJoeBob1
What do you mean when you say "Do not discount the effects of the fluid regardless of what anyone says." I have found that gears are very tricky and if gears are run at a wrong pattern, the sound will never go away regardless of whether the new pattern is perfect. And I think .0045 on the backlash is a little tight and might get a little hot, that is very little room for the fluid to get in there. Just my humble opinion from the info that I have gathered.
