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06-16-2005, 10:13 PM
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#1 |
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Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Now what???
Man, if it ain't one thing, it's another. Now that I've got my new exhaust on the truck and everything is a little quieter, I've discovered a roaring coming from the back of the truck. It's almost like a low pitched roaring/grinding sound and it is definitely RPM related. I hadn't noticed it before, but I can sure hear it now. My first thought would be a bad rear axle bearing. What do you think, and how could I check this out to be sure before I go tearing into my rearend?
One other thing that has reared it's ugly head is a popping or a metallic thunk when I go from park to drive or from neutral to drive. It ain't so bad from park to reverse. Is this u-joint problems you think? Thanks for the help.
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 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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06-16-2005, 10:22 PM
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#2 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Sounds like it could be a u-joint. Get under it and give them a wiggle. My rear end is so worn that it pops some when going from Park to Reverse. Yours could be the same way. Hard to say.
When you say it is RPM related, do you mean speed related instead? If you go the same speed in a different gear (a change in RPM but a constant speed), does it sound the same? If not, I would think that would rule out the rear end. Good luck, Slonaker |
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06-16-2005, 10:40 PM
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#3 |
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Senior Member
Join Date: Sep 2004
Location: Georgia
Posts: 614
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Yea, I mean't speed related. When I speed up and slow down in the same gear, the noise speeds up and slows down. Also, the noise is not constant. Kinda hard to explain, but it's like you can hear the noise only during a certain part of the wheel revolution. For fear of sounding like an idiot, it goes something like this: grind....grind....grind....grind
 , only during a certain point in the wheel revolution. Ok, you can get up off the floor now 
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2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado |
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06-16-2005, 10:47 PM
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#4 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Yeah, that does not sound good. I had a front wheel bearing do that when it went dry right after I bought the truck. It sounded just like you describe. You might want to make sure the rear end is full of gear lube. It only takes a minute. Well, it only took a minutes after the ten minutes I spent finding the fill hole under 20 years worth of crud.
 Slonaker |
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06-21-2005, 09:17 AM
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#5 |
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Registered User
Join Date: Apr 2005
Location: Tulsa Oklahoma
Posts: 943
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one thing i can suggest is to put the gear oil made by lucas it is really a big diffrent as far as for taking up the slake of worn gears and pinion
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square body trucks an addiction or an investment either way they consume all my extra time and money |
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06-21-2005, 09:40 AM
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#6 |
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Registered User
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
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I would say your "clunk" is slack in your gears. I had the same thing and changed gears, as well as the differential, and it stopped. Now may be a good time for a gear and posi swap.
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Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels |
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