Guest TurboHatch Posted January 21, 2010 Share Posted January 21, 2010 Ok I am feeling a little vibration in the car, so I put the car up on jack stands and measured the angle of the trans and the diff, now granted the car wasnt 100% level but here is what I had, the tranny was angled down 2 degrees and the diff was angled up almost 4. If i understand correctly this is why i was getting vibrations, so I put 4 or 5 washers between the diff and the mount and lowered the nose some, If i understand correctly i want the diff to end up at +2 so its equal to the trannys -2 correct? if im wrong then what do I want the diff set to with the trans at -2? i spent all day reading every pinion guide on here and google so please dont post another guide just tell me what to set the diff to with the trans at -2, thanks Quote Link to comment Share on other sites More sharing options...
bjhines Posted January 21, 2010 Share Posted January 21, 2010 You got it. as long as you can accurately measure your angles. It is harder to check horizontal angles, and they should be correct. Collision damage or broken drivetrain mounts can cause horizontal misalignment in some cases. Quote Link to comment Share on other sites More sharing options...
Guest TurboHatch Posted January 21, 2010 Share Posted January 21, 2010 Yeah plus since the v8 motor mounts and the rear end mount are all custom made its hard to tell if if aligns up as you said. aside from eye balling it how do you tell? Quote Link to comment Share on other sites More sharing options...
johnc Posted January 21, 2010 Share Posted January 21, 2010 Laser level from Home Depot. Make sure you get one that can shoot a plane instead of a spot. Quote Link to comment Share on other sites More sharing options...
Guest TurboHatch Posted January 21, 2010 Share Posted January 21, 2010 I have one of those, so do you just shoot it down the center of the rear and see if it seems to intersect the center of the tranny? Quote Link to comment Share on other sites More sharing options...
johnc Posted January 21, 2010 Share Posted January 21, 2010 Shoot it down the center of the pinion shaft, not the center of the diff. Make sure the plane hits the center of the trans tailshaft and goes down the centerline of the tailshaft. Quote Link to comment Share on other sites More sharing options...
Guest TurboHatch Posted January 22, 2010 Share Posted January 22, 2010 ok will do thanks Quote Link to comment Share on other sites More sharing options...
Guest TurboHatch Posted February 5, 2010 Share Posted February 5, 2010 I wanted to update this thread, after messing with pinion angle for ever and still having some mild vibration i decided to have the driveshaft checked, It turns out it was 12 grams out of balance and the run out was slightly off, after having it fixed i now have no vibration. my current up and down pinion is 2 degree down on tranny and 3 degree up on pinion and the side to side is slightly off as well but not much and i cant measure it, however i have no vibration up to as far as i tested which was 135 mph. Quote Link to comment Share on other sites More sharing options...
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