High Speed Vibration
3/9/08, 02:29 PM
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High Speed Vibration
I have a high speed vibration that starts around 90 mph and gets worse the faster I go. So I haven't been driving that fast anymore because I don't want to damage anything. I have had two JPC driveshafts, three spyder shafts and I currently have a shaftmasters on there now. The vibration wasn't there with the factory shaft. I recently install a detriot truetrac with a new FRPP 4.10 gearset. I install all new bearings except for the axle bearings. The gears are quiet and the pattern was great, the preload was spot on. I thought it was the driveshaft originally because I got most of the vibration out of it with hose clamps on the JPC shaft. Since I sent the other JPC shaft back I got a sydershaft. I waited to install the shaft because I was going to do it all at once when I did the reared build. I have checked the pinion angle I have tried -2 and -1. The pinion angle didn't change the vibration at all. The first driveshaft from spyder was really bad at 60. The second shaft was better and the third shaft was great to 90. This lead me to think that the problem was with the driveshaft, after installing the shaftmasters driveshaft the vibration had seemed to be less but it is still there. I have checked the balance and road force variation and rotated the tires. Still no change, I inspected the axleshafts when I did the install of the rearend. But I never checked them with a straight edge. I am really at wits end here. I will be installing new axle bearing soon and checking the integrity of the axle shafts. Any suggests?
3/9/08, 05:08 PM
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Wow...you have had more driveshafts than most of us have had girlfriends. Just a stupid question...Are you sure it not your wheels and tires that are the issue?? The reason I ask is because I had a set of stock wheels and tires that shimmied like a *****!! I had the car undercoated and it was on the inside of the rims which caused my vibrations...just a thought!
BTW...welcome to the forum!!
Scott
BTW...welcome to the forum!!
Scott
Last edited by 70MACH1OWNER; 3/9/08 at 05:11 PM.
3/9/08, 07:32 PM
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I have a high speed vibration that starts around 90 mph and gets worse the faster I go. So I haven't been driving that fast anymore because I don't want to damage anything. I have had two JPC driveshafts, three spyder shafts and I currently have a shaftmasters on there now. The vibration wasn't there with the factory shaft. I recently install a detriot truetrac with a new FRPP 4.10 gearset. I install all new bearings except for the axle bearings. The gears are quiet and the pattern was great, the preload was spot on. I thought it was the driveshaft originally because I got most of the vibration out of it with hose clamps on the JPC shaft. Since I sent the other JPC shaft back I got a sydershaft. I waited to install the shaft because I was going to do it all at once when I did the reared build. I have checked the pinion angle I have tried -2 and -1. The pinion angle didn't change the vibration at all. The first driveshaft from spyder was really bad at 60. The second shaft was better and the third shaft was great to 90. This lead me to think that the problem was with the driveshaft, after installing the shaftmasters driveshaft the vibration had seemed to be less but it is still there. I have checked the balance and road force variation and rotated the tires. Still no change, I inspected the axleshafts when I did the install of the rearend. But I never checked them with a straight edge. I am really at wits end here. I will be installing new axle bearing soon and checking the integrity of the axle shafts. Any suggests?
Robert
Last edited by shaftmasters; 3/10/08 at 07:32 AM.
3/9/08, 07:44 PM
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Robert I have been in contact with David. I already had 4.10 gear in the car with the factory shaft. I rebuilt the rearend with a trutrac and a new FRPP gear set (4.10 with the "A" in the part number). All new bearings except for the axle bearings. The vibration is more of a humming noise, but you can still feel the vibration. The vibration seems to be there in 4th and 5th gears. The JPC shafts (I got some of the vibration out of the JPC shafts with hose clamps) and the first and second sydershaft were horrible. The third shaft from LRP was much better and the shaftmaster shaft was a small improvement.
3/9/08, 08:40 PM
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I realize that now, the JPC shafts have had a long history of problems. I also reduced the vibration with hose clamps on the JPC shaft. I sent those back and already had the rearend parts waiting on installation. So I decided on using a spydershaft. The first and second shafts had bad vibraitons(60 and 90 mph), Ron changed somethings and sent the first shaft back. This one was way better but still bad at 90+, I just got fed up and order a shaftmaster shaft and there was only a small improvement. I am going to inspect the axle shafts more closely this week, when I replace the axle bearings.
Last edited by jtgrant; 3/9/08 at 08:55 PM.
3/10/08, 03:41 AM
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I realize that now, the JPC shafts have had a long history of problems. I also reduced the vibration with hose clamps on the JPC shaft. I sent those back and already had the rearend parts waiting on installation. So I decided on using a spydershaft. The first and second shafts had bad vibraitons(60 and 90 mph), Ron changed somethings and sent the first shaft back. This one was way better but still bad at 90+, I just got fed up and order a shaftmaster shaft and there was only a small improvement. I am going to inspect the axle shafts more closely this week, when I replace the axle bearings.
Robert
Last edited by shaftmasters; 3/10/08 at 07:12 AM.
3/10/08, 06:37 AM
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Just this morning while driving to work, I noticed an intermittent clicking noise from the rear axle (while coasting to a stop). Which really sounds like a bad axle bearing.
3/14/08, 03:23 PM
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I have a high speed vibration that starts around 90 mph and gets worse the faster I go. So I haven't been driving that fast anymore because I don't want to damage anything. I have had two JPC driveshafts, three spyder shafts and I currently have a shaftmasters on there now. The vibration wasn't there with the factory shaft. I recently install a detriot truetrac with a new FRPP 4.10 gearset. I install all new bearings except for the axle bearings. The gears are quiet and the pattern was great, the preload was spot on. I thought it was the driveshaft originally because I got most of the vibration out of it with hose clamps on the JPC shaft. Since I sent the other JPC shaft back I got a sydershaft. I waited to install the shaft because I was going to do it all at once when I did the reared build. I have checked the pinion angle I have tried -2 and -1. The pinion angle didn't change the vibration at all. The first driveshaft from spyder was really bad at 60. The second shaft was better and the third shaft was great to 90. This lead me to think that the problem was with the driveshaft, after installing the shaftmasters driveshaft the vibration had seemed to be less but it is still there. I have checked the balance and road force variation and rotated the tires. Still no change, I inspected the axleshafts when I did the install of the rearend. But I never checked them with a straight edge. I am really at wits end here. I will be installing new axle bearing soon and checking the integrity of the axle shafts. Any suggests?
Me too!!
