vibration thread - aluminum driveshaft cures it! February 20, 2012, 09:52:53 AM EDIT: Car had a vibration, thought it might be the wheels. I'm was ready for a wheel change anyway so I ordered a new set of wheels. Got the new wheels mounted but the vibration is still there. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #1 – February 21, 2012, 07:20:38 PM Wheels shipped today! Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #2 – February 25, 2012, 11:10:37 AM Got the new wheels on if anyone cares. I will post pics later. The vibration is still there... Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #3 – February 25, 2012, 01:55:19 PM maybe it's the driveshaft? bent axle? Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #4 – February 25, 2012, 02:23:33 PM Of course we care! Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #5 – February 25, 2012, 03:55:45 PM We'll care when we SEE IT!!!!!!!!!!!!!! But those oughta be good. You think the vibration is in front or back? Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #6 – February 25, 2012, 04:31:23 PM Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #7 – February 25, 2012, 04:33:23 PM LOL!! I'm sure they look good. I just got a set of Cobra R's like yours. Now I need a set of plain centers for them. I checked late model resto but I couldn't find the plain ones. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #8 – February 25, 2012, 04:49:32 PM Vibration seems to come from the rear. I have had the driveshaft checked for balance at a place that makes driveshafts. I had the axles out and they seemed true. I'm about out of options...there is a thread somewhere I had on this issue and I had a long list of things I've tried to remedy it. All I know is the car was 100% stock. I swapped in a TC 8.8 w/3.73's, lowered it on Steeda springs, and added the 17x9 wheels and ever since then there has been this vibration which comes in around 65-70mph. I've done the following:1.) set pinion angle with CHE adj upper control arms2.) driveshaft balanced3.) new u-joints4.) tranny has been changed from AOD to T55.) new motor mounts6.) different wheels (same tires though)7.) I had a local guy who builds rear diff's go through the axle. Its been totally rebuilt (all new bearings, carrier, etc)8.) brake rotors "turned" at local NAPA9.) new exhaust system no rubbing anywhere10.) wheels have been rotated front to rear no change in vibrationI'll start a new thread in the user rides section to show the new wheels. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #9 – February 25, 2012, 04:59:28 PM I was going to say possibly the tires since they're the same ones. But if you rotated them it's probably not them. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #10 – February 25, 2012, 05:04:23 PM I guarantee its something silly and simple. I am planning on putting TC-spec Moog springs in the rear to bring it up a tad and improve ride. When I do so I'm contemplating putting back in the stock control arms to see if maybe the CHA arms are somehow transmitting a vibration. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #11 – February 25, 2012, 05:18:11 PM Do the TC springs lower it a little? I tried lowering mine but it was a mess! I originally bought a set of Ford Motorsports lowering springs for a Mustang and that was way too low! I sold those when I found what was suppose to be a FMS kit for the T-Bird, but it sagged in the rear really bad. I tried stock sn95 stang rear springs, it got worse, then I tried stock fox stang springs, they brought it back up a little but it still sagged really bad. Dan saw it at the Artherities show like that. It was bad. Then I found an 87 or 88 Cougar in the jy and got the stock rears from it. Guess what? It sets level now! I guess the front springs where original spec instead of lowering springs. I'd still like it to be a little lower but I'm not sure I want to deal with it again. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #12 – February 25, 2012, 05:51:04 PM Check your tires for "cupping.". To do that, run your hand over the tread of each tire in the opposite direction of rotation. If your tires are cupped, you'll feel it with your hand. You know what a circular saw blade looks like from the side. That's what the profile of a cupped tire looks like from the side instead of being truly round. The visual effect just won't be as extreme. Cupped tires normally start causing problems like that at higher speeds unless they're badly cupped. Bad struts and shocks can cause cupping. You didn't mention how old yours were. Bad ball joints can also cause a shaking effect that can show up on the highway. If you haven't checked your balls lately, now would be a good time to do it. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #13 – February 25, 2012, 06:37:31 PM check the backlash in the rear end... my old 7.5 used to make the car shudder going down the highway. i'd get in it and it would go away, but maintaining speed at 65 70 mph was a vibrating mess. Quote Selected
vibration thread - aluminum driveshaft cures it! Reply #14 – February 25, 2012, 09:51:59 PM Quote from: 88 Blackbird 5.0;381910Check your tires for "cupping.". To do that, run your hand over the tread of each tire in the opposite direction of rotation. If your tires are cupped, you'll feel it with your hand. You know what a circular saw blade looks like from the side. That's what the profile of a cupped tire looks like from the side instead of being truly round. The visual effect just won't be as extreme. Cupped tires normally start causing problems like that at higher speeds unless they're badly cupped. Bad struts and shocks can cause cupping. You didn't mention how old yours were. Bad ball joints can also cause a shaking effect that can show up on the highway. If you haven't checked your balls lately, now would be a good time to do it. This vibration has been there since these tires were brand new, so that should rule out the tires being cupped. Good thought though.Sorry I should have mentioned that I put on new monroe shocks and struts right after I lowered the car. I checked the balljoints last year when I did the new rack/ps pump and they seemed OK. Its definately in the driveline and rear of the car...I'm confident its nothing to do with the steering. Quote Selected
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