Whining
03-12-2010, 10:43 AM
#1
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Whining I just installed some Motive 3.73 gears in my 10 bolt with .008 backlash (Motive calls for .007-.009) and a perfect pattern and I still got a whine. On the first test drive it started out dead silent but before I made it back home it started whining on decell and at cruising speed. It was only about a 2 mile drive. I read on here that sometimes it helps to tighten down the pinion nut a 1/4 turn. Well 1/4 seemed alot to me so I just tightened it down a little less than an 1/8 turn. So I take it for another test drive and now it does not whine on decell but it still has a small whine at cruising speed. So I tighten down another 1/8 of a turn but this time it does not make any difference.
I am going to remove the cover and recheck everything but I was wondering if anyone had any ideas of what the problem may be? It only whines at cruising speed while giving it just enuff gas to maintain a certain speed. The whining starts at about 30mph and increases up til about 65mph. Its not incredibly loud but its more than Im willing to settle for. There is no whine during accelleration or decell.
Please Help!
I am going to remove the cover and recheck everything but I was wondering if anyone had any ideas of what the problem may be? It only whines at cruising speed while giving it just enuff gas to maintain a certain speed. The whining starts at about 30mph and increases up til about 65mph. Its not incredibly loud but its more than Im willing to settle for. There is no whine during accelleration or decell.
Please Help!
03-12-2010, 10:58 AM
#2
I just installed some Motive 3.73 gears in my 10 bolt with .008 backlash (Motive calls for .007-.009) and a perfect pattern and I still got a whine. On the first test drive it started out dead silent but before I made it back home it started whining on decell and at cruising speed. It was only about a 2 mile drive. I read on here that sometimes it helps to tighten down the pinion nut a 1/4 turn. Well 1/4 seemed alot to me so I just tightened it down a little less than an 1/8 turn. So I take it for another test drive and now it does not whine on decell but it still has a small whine at cruising speed. So I tighten down another 1/8 of a turn but this time it does not make any difference.
I am going to remove the cover and recheck everything but I was wondering if anyone had any ideas of what the problem may be? It only whines at cruising speed while giving it just enuff gas to maintain a certain speed. The whining starts at about 30mph and increases up til about 65mph. Its not incredibly loud but its more than Im willing to settle for. There is no whine during accelleration or decell.
Please Help!
I am going to remove the cover and recheck everything but I was wondering if anyone had any ideas of what the problem may be? It only whines at cruising speed while giving it just enuff gas to maintain a certain speed. The whining starts at about 30mph and increases up til about 65mph. Its not incredibly loud but its more than Im willing to settle for. There is no whine during accelleration or decell.
Please Help!
03-12-2010, 11:09 AM
#3
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Does it seem that some rears like a 9" are just a little louder even when set up properly? When I listen to 9" rears at the track I sure hear a lot of them making noise with power off and coasting in the shut off area.
03-12-2010, 03:14 PM
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Well what are the specs on the pinion preload? And, what is this 1/8 to 1/4 turn you are referring to. Whoever said that is how you adjust preload is sadly mistaken. There is a specific amount of preload supposed to be on the bearings. New bearings or old bearings?
03-12-2010, 10:18 PM
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Old bearings. I set it back to what it was with the old gears about 18 in lbs. I know turning it 1/8 and 1/4 after setup is not how you adjust bearing preload but figured I didnt have anything to lose since it was whining.
03-14-2010, 12:36 PM
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I pulled my rearend back apart. The backlash was at .012 I set it at .008. Not sure how it changed the chunk was shimmed very tight. I didnt check the pattern. I reassembled everything and reset the backlash at .007 and this is what the pattern looked like. First 2 pic are drive second 2 are coast. Where do I go from here?
