, I was once one in my younger days . To make a long story short,I'm going back to Mustang. A Shelby 500 to be exact. Something with a bitchin sounding true duals & a GOOD solid rear end with NO howl on the highway and a roomy back seat .
After breaking in 1000 miles on my 9".... can I do anything about the whine?
hahahahahaha, this thread makes me laugh. There are several reasons a gear can make noise; type of gear and proper setup are probably the major reasons. OEM gears should be quite no matter what application/rearend you put them in. Aftermarket gears for the most part should not make noise if you get a good brand. Bottom line if a gear is excessively noisey I would take another look at it. Any time you race a car you put more stress and load on the differential, therefore opening the door for more potential noise and problems. Just my .02.
Jeff
Jaw's Gear & Axle
866-922-5297
http://www.jawsgear.com
Jeff
Jaw's Gear & Axle
866-922-5297
http://www.jawsgear.com
get the hell out of here, whos needs a whiny bastard that cant work on his car and get things right......have fun with a unreliable ford
Joined: Mar 2005
Posts: 1,599
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From: 32639 Groesbeck HWY. Fraser MI 48026
After working for an aftermarket gear manufacturer I can tell you that they did consider noise when producing gears, and in most cases it was a top consideration. Whether it was the process for manufacture, the material, double lapping, equipment used, etc., noise was always a concern. Some gears noise just isnt an issue though. You make a 5.29 gear and chances are it is going into a really loud car or a 4x4 with big tires that will be noisy anyway. As far as housings, the 9" housing are a proven aftermarket piece (at least the Strange ones are, not so sure about the cheaper street "s" cases). The 12 bolt housings I have always considered suspect, and if the housing isnt right it will be near impossible to set up quiet.
What about center lines from the differential bores to the center line of the pinion? What about the aftermakret center sections checking to soft with a Rockwell hardness tester? I've seen patterns change afer a few miles of driving from housing center secitons distorting under load, and thats using an OEM gear set. Give different ratio's will make noise no matter what pinion depth that are set up at. Most ratio's I deal with are 4.30 and numerically lower and I would say about 75% are quiet. Motive Performance has been top of the line with Strange following.
Hi Scott, you ever going to call me?
Bill
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For the most part I agree with the vendors input in this thread. To the guy who was sold a 9" because they are quieter than a 12 bolt? Whoever told you that was selling you on that product. 9" rears have a lower pinion position which help give them strength but also increases the sensitivity to noise so they are noisier more often than a 12 bolt although anything can be noisy.
As far as I'm concerned nothing makes a bigger difference in noise than the type of gears. motive orange box, OEM , FMS all make good quiet gears. Moser is using whatever makes them the most coin I can tell you that much. FWIW race gears are typically loud.
Not that I've produced near the volume of Moser or Strange but I've never had a noisy rear yet but i do all my own set ups and use TOP quality parts. In fact I've yet to have one break either *pats self on the back* lol shameless? perhaps
As far as I'm concerned nothing makes a bigger difference in noise than the type of gears. motive orange box, OEM , FMS all make good quiet gears. Moser is using whatever makes them the most coin I can tell you that much. FWIW race gears are typically loud.
Not that I've produced near the volume of Moser or Strange but I've never had a noisy rear yet but i do all my own set ups and use TOP quality parts. In fact I've yet to have one break either *pats self on the back* lol shameless? perhaps
For the most part I agree with the vendors input in this thread. To the guy who was sold a 9" because they are quieter than a 12 bolt? Whoever told you that was selling you on that product. 9" rears have a lower pinion position which help give them strength but also increases the sensitivity to noise so they are noisier more often than a 12 bolt although anything can be noisy.
As far as I'm concerned nothing makes a bigger difference in noise than the type of gears. motive orange box, OEM , FMS all make good quiet gears. Moser is using whatever makes them the most coin I can tell you that much. FWIW race gears are typically loud.
Not that I've produced near the volume of Moser or Strange but I've never had a noisy rear yet but i do all my own set ups and use TOP quality parts. In fact I've yet to have one break either *pats self on the back* lol shameless? perhaps
As far as I'm concerned nothing makes a bigger difference in noise than the type of gears. motive orange box, OEM , FMS all make good quiet gears. Moser is using whatever makes them the most coin I can tell you that much. FWIW race gears are typically loud.
Not that I've produced near the volume of Moser or Strange but I've never had a noisy rear yet but i do all my own set ups and use TOP quality parts. In fact I've yet to have one break either *pats self on the back* lol shameless? perhaps
Put a 12 bolt into a early Chevelle, Nova, Camaro, etc and you can beat the crap out of it, and not hurt anything. Put one into one of our cars with a torque arm, make a couple 4000 to 5000 dragstrip launches, and I can just about guarantee you'll pick up gear noise. If it is a drag only car, you'll never know or care about the gear noise. Drive your car home from the track, and the noise will drive you nuts. I feel the torque arm stresses the 12 bolt housing, causing distortion. We have never seen this happen with the 9 inch housing. We've seen this happen with Moser and strane rearends. Bob
True the torque arm places massive amounts of force on the housing in the 12 bolts design and that certainly does not do collapsible spacers any good. Its definitely a very valid point why the 9" is proving substantially stronger than the 12 bolt in this area being that they use a mount design that places less stress on the housing in the pinion area. Mind you I've always thought that Moser TQA system of using little bolts on tabs for the arm was bogus. I'm sure it flexes all over and thats why the bolts notoriously come loose. Strange isn't much better the plates that the bolts go through are not gusseted or supported properly. There was just not enough R&D and thought at all to how those 12 bolts were created. Not to mention I still think that the after market castings themselves are not as good as OEM pieces. Regardless on a 12 bolt solid pinion spacers should be mandatory it would help
