gear help
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Staging Lane
Joined: Nov 2011
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gear help I just got a camaro z28 and i have 4:10 gears in it, so what happens is the gears when i drive they whine when i pass like 30. when i let off the gas it stops but as soon as i give gas i hear it again. so the dude I bought it from said that it needs more backlash. is there a way to stop the whine without taking it to the mechanic someone told me to get gear oil that is thick that can stop it. or if you have any suggestions please let me know.
Joined: Jun 2009
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From: go get your shine box tommy
When the gears are not set up properly you risk breaking them. Thicker oil will just mask it. I would get them adjusted but if you really want to, go with redline heavy shockproof oil and mix half with regular if you are up north or full is okay if you are down south.
3:73's and up make whinning noise in the 7.5's so it could b normal noise but yes use a Synthetic Gear Fluid ! I noticed in your picture of under your car u have the stock rearend cover i would buy a Stud Girdle Cover which helps strenghten your rear end from breaking !
Last edited by blk/slvr02ss; Nov 30, 2011 at 03:45 PM.
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
4.10:1 (or just "4.10" as it's usually expressed) means that for every 4.10 revolutions of transmission output (driveshaft), the tires make one revolution.
4:10 (or 4.00:10) would mean that for every 4 revolutions of transmission output, the tires would make 10 revolutions. This is just not the way that differential ratios are measured. To bring this into equal measurement, it would be expressed as a 0.40:1 ratio, which would offer extremely unfavorable mechanical advantage (or in this case, mechanical disadvantage).
4:10 (or 4.00:10) would mean that for every 4 revolutions of transmission output, the tires would make 10 revolutions. This is just not the way that differential ratios are measured. To bring this into equal measurement, it would be expressed as a 0.40:1 ratio, which would offer extremely unfavorable mechanical advantage (or in this case, mechanical disadvantage).
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From: Schiller Park, ILL Member: #317
No, 4.10 or 4.10:1 and 4:10 both mean something, but what they actually represent is entirely different.
Not sure why some people have a hard time with this.
If you have a 9.5:1 compression engine, would you ever write it as "9:5"? Nobody does that, so I have no idea why some people express 4.10:1 (or simply "4.10s") as 4:10.
Not sure why some people have a hard time with this.
If you have a 9.5:1 compression engine, would you ever write it as "9:5"? Nobody does that, so I have no idea why some people express 4.10:1 (or simply "4.10s") as 4:10.
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Lash between pinion and ring gear are off. If they are to tight the whine on the accell and two loose will cause whine on decel. Or vice versa can't recall off top of my head. But that is the issue. If it's a drag type gear set sometimes they can whine a bit as well, but that's in the steel rather than lash adjustment. Good luck and hope this helps. I just read where you said someone said lash. He's right on the money. No way around it. If you mask the whine it's just going to ruin your gear set. And short of saw dust I don't know of anyway to muffle improper lash whine.
Teching In
Joined: Feb 2004
Posts: 15
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From: Sweden
English not being my native language I have had som difficulty understanding exactly what Backlash is. Am I correct when I say it´s the very small gap between the "teeth" of the pinion and the gear ring? I mean, if I turn the pinion clockwise until the gear ring starts moving then stop and slowly turning it anti-clockwise there will be a very small gap until the gear ring also starts moving the other way, is that the Backlash distance right there?
On The Tree
Joined: Dec 2011
Posts: 109
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From: Kissimmee, Florida
Depends if its a 2 series carrier or 3. Short gears like 4:10 gears for 2 series carriers are much thicker and adjustments to pinion depth might lie in the shim behind it being too thin. 3 series units more or less re-use the same depth, where shimming would be much easier. 3:73 gears and higher do make some noise, but should not be that noticeable...that's where gear maufacturers come to play. None share the same lash...
English not being my native language I have had som difficulty understanding exactly what Backlash is. Am I correct when I say it´s the very small gap between the "teeth" of the pinion and the gear ring? I mean, if I turn the pinion clockwise until the gear ring starts moving then stop and slowly turning it anti-clockwise there will be a very small gap until the gear ring also starts moving the other way, is that the Backlash distance right there?
Lash between pinion and ring gear are off. If they are to tight the whine on the accell and two loose will cause whine on decel. Or vice versa can't recall off top of my head. But that is the issue. If it's a drag type gear set sometimes they can whine a bit as well, but that's in the steel rather than lash adjustment. Good luck and hope this helps. I just read where you said someone said lash. He's right on the money. No way around it. If you mask the whine it's just going to ruin your gear set. And short of saw dust I don't know of anyway to muffle improper lash whine.
Al 95 Z28
