socorob Posted April 2, 2015 Author Share Posted April 2, 2015 (edited) So is your diff and trans parallel with 2 degrees of angle on both sides to the driveshaft? I'm awaiting the lift to free up so I can check all this out. I will check the u join phasing and angles. Even if they're right I'm still tempted to pull off the shaft and bring it to a local ship to verify the balance. I want to go to zcon but couldn't stand the ride up there as it is. Edited April 2, 2015 by socorob Quote Link to comment Share on other sites More sharing options...
whatnow123 Posted April 2, 2015 Share Posted April 2, 2015 (edited) "2 degrees of angle on both sides to the drive shaft". Correct. The rear flange of the trans and the angle of the driveshaft should not be more than 3 degrees. Same with the differential flange to the driveshaft. Mine is now 2 and 2. The rear was between 4 and 5 before I shimmed it up.. which I now know was the problem along with the phase of the u-joints. I'm actually surprised my car didn't vibrate more! Edited April 2, 2015 by whatnow123 Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted April 3, 2015 Share Posted April 3, 2015 Driveshaft issues were the culprit with my vibration issue last year. Had a 3" custom driveshaft made, no problems anymore. I have also had tape on wheel weights come off and give me fits until I figured it out. Quote Link to comment Share on other sites More sharing options...
Phantom Posted April 3, 2015 Share Posted April 3, 2015 I have a set of 16x7 Centerline wheels on my car. Got them back in 1997. The ONLY way they will balance is with weights on BOTH the inside and the outside of the wheel. I forget how many times people have asked me why I have weights on the outside of my wheels. They look like crap but I don't have vibration. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 3, 2015 Share Posted April 3, 2015 I have a set of 16x7 Centerline wheels on my car. Got them back in 1997. The ONLY way they will balance is with weights on BOTH the inside and the outside of the wheel. I forget how many times people have asked me why I have weights on the outside of my wheels. They look like crap but I don't have vibration. Yep. If it only has weights on the inside, you've got a static balance. Lots of cars will have a vibration with a static balance. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted April 4, 2015 Share Posted April 4, 2015 For what it's worth I had an annoying vibration from 35 to 45 mph in my truck that I swore came from the left front tire. It was a bad u joint in the driveshaft. Quote Link to comment Share on other sites More sharing options...
socorob Posted April 4, 2015 Author Share Posted April 4, 2015 Well, Johns cars sent me the driveshaft and I have barely over 1000 miles on the car since I got it running, so I hope it's not that. Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 4, 2015 Share Posted April 4, 2015 I rotated the tires and the vibration moved around with the wheels, . they ran it twice for me, and said they are all perfect now. I got it out and now the vibration is around 80. The new balancing took over half the vibration out and it moved it up in speed some. At this point I'm going to trust these guys have them properly balanced and move on down the line trying to figure out what's vibrating. Trust but verify. Old cold war saying. Ronald Reagan. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted April 4, 2015 Share Posted April 4, 2015 (edited) It's worth looking into I suppose if you have ruled out wheels and tires. You might want to look into pinion angles as well. http://www.hotrod.com/how-to/paint-body/91758/ Edited April 4, 2015 by Naptown Dave Quote Link to comment Share on other sites More sharing options...
cheesepocket Posted April 10, 2015 Share Posted April 10, 2015 Tremec has a free app for your smartphone to help with finding the angle on both ends of the driveshaft. Make sure you are checking on machined surfaces, not as-cast. Quote Link to comment Share on other sites More sharing options...
Jay Gadsby Posted April 10, 2015 Share Posted April 10, 2015 Cook app, thanks for the info. Quote Link to comment Share on other sites More sharing options...
socorob Posted May 6, 2015 Author Share Posted May 6, 2015 Probably going to my 1st track night tomorrow (if it doesn't rain), so I started checking everything I could and found the drivers front spindle nut was slightly loose. I checked them all twice when I first put it all together so not sure how that happened. That took a lot of the vibration out. Now all I'm left with is a slight vibration above 80. Do y'all think if the alignment is off that it could cause a little vibration? Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted May 6, 2015 Share Posted May 6, 2015 Find a shop that can "true" your tires? Don't worry too much about getting it perfect-I had a track day when I kept picking up OPR and that caused a ton of vibrations that I couldn't predict nor tune out. I just kept on driving! Quote Link to comment Share on other sites More sharing options...
socorob Posted May 6, 2015 Author Share Posted May 6, 2015 It's hard to find a shop around here to do a proper alignment! I called about 5 shops with my last car trying to find one that would put it as close to my specs as possible. They all told me flat out no, they just get it in the green on the machine. Ended up having to go to a shop 2 towns over to get it done. Chances pf me finding a place around here to do anything specialized is very low. Do you put your konis on full hard when you did a road course? I have no idea what to use for a starting point. Quote Link to comment Share on other sites More sharing options...
Phantom Posted May 9, 2015 Share Posted May 9, 2015 Yes - alignment can contribute to vibration - especially if you're running wheels/tires bigger than the stock 195/70-14. Quote Link to comment Share on other sites More sharing options...
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