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Help with drivetrain issue?
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<blockquote data-quote="cobralvr01" data-source="post: 14993522" data-attributes="member: 164560"><p>So here's the breakdown.</p><p>I purchased a completely stock 1997 cobra with 104k miles on it in January of 2015. I'm driving it around for sometime like this with no problems other than a constant whining sound between 40-80mph. My friend at work was constantly wanting to race. So, on the way to Race Wars I indulge. Everything's going fine up until about 110 mph+. Once I get to this, I get a vibration/rattling noise in the back. When I say rattling, I really mean clunking/rattling. With this in the back of my mind, a constant whining noise from the rear, and the rear rattling/clunking when decelerating (very pronounced when decelerating in nuetral), I decided to pull the trigger and rebuild the rear end and throw in some 4.10's while I'm at it.</p><p></p><p>During disassembly I noticed that my upper passenger control arm is shot. Of course I thought, "This has to be the cause of the vibration". So, I decided I will replace all of the control arms as well as the bushings on the diff. </p><p></p><p>Specs on rear diff:</p><p>Pinion Bearing Preload w/ all new bearings ~29-30 in/lbs (I know this is pretty high, but I researched that new bearings get much higher preload and will eventually slack up on this preload the more you drive) </p><p>Backlash ~ .0012 </p><p>Wear pattern ~ sat nearly in middle on accel and decel sides. The pattern sat slightly inward in reference to the rear diff of where the centerline would be. </p><p></p><p>After I finish buttoning everything up I decide to go for a drive. WOW! It drives incredible...but that was last week. This week, however, I am getting that clunking/vibration from the rear again, however, it is at 90mph +. </p><p>I am kind of confident that it may be the driveshaft is out of balance and the new gears + new control arms are making the vibrations/clunking more pronounced.</p><p>I have researched the web and they all say an aluminum driveshaft will clear up the vibration, but they didn't say anything about a clunking sound. Should I look into getting an aftermarket aluminum driveshaft simply to remedy the problem or should I be more worried about having to redo the rear? I'm not sure the rebuilt rear diff is the problem because this was a pre-existing problem, but it's more pronounced now at slower speeds. It's nearly at the point to where I feel the rear end will blow up and I'm worried about going over 80mph.</p></blockquote><p></p>
[QUOTE="cobralvr01, post: 14993522, member: 164560"] So here's the breakdown. I purchased a completely stock 1997 cobra with 104k miles on it in January of 2015. I'm driving it around for sometime like this with no problems other than a constant whining sound between 40-80mph. My friend at work was constantly wanting to race. So, on the way to Race Wars I indulge. Everything's going fine up until about 110 mph+. Once I get to this, I get a vibration/rattling noise in the back. When I say rattling, I really mean clunking/rattling. With this in the back of my mind, a constant whining noise from the rear, and the rear rattling/clunking when decelerating (very pronounced when decelerating in nuetral), I decided to pull the trigger and rebuild the rear end and throw in some 4.10's while I'm at it. During disassembly I noticed that my upper passenger control arm is shot. Of course I thought, "This has to be the cause of the vibration". So, I decided I will replace all of the control arms as well as the bushings on the diff. Specs on rear diff: Pinion Bearing Preload w/ all new bearings ~29-30 in/lbs (I know this is pretty high, but I researched that new bearings get much higher preload and will eventually slack up on this preload the more you drive) Backlash ~ .0012 Wear pattern ~ sat nearly in middle on accel and decel sides. The pattern sat slightly inward in reference to the rear diff of where the centerline would be. After I finish buttoning everything up I decide to go for a drive. WOW! It drives incredible...but that was last week. This week, however, I am getting that clunking/vibration from the rear again, however, it is at 90mph +. I am kind of confident that it may be the driveshaft is out of balance and the new gears + new control arms are making the vibrations/clunking more pronounced. I have researched the web and they all say an aluminum driveshaft will clear up the vibration, but they didn't say anything about a clunking sound. Should I look into getting an aftermarket aluminum driveshaft simply to remedy the problem or should I be more worried about having to redo the rear? I'm not sure the rebuilt rear diff is the problem because this was a pre-existing problem, but it's more pronounced now at slower speeds. It's nearly at the point to where I feel the rear end will blow up and I'm worried about going over 80mph. [/QUOTE]
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