Quote from purpleheart on 01/12/11 at 23:15:23:If your tranny is down 4 deg , driveshaft at 0 deg and rearend up 2 deg you'll have 2 deg positive pinion angle . Look at Fig 2 on this link
http://home.flash.net/~ivc1/cobra/irsvibes.html yours is the opposite . Here's a pic of a 4x4 driveshaft
http://www.4x4now.com/gt0899.htm . If the rearend climbs upward on the launch it will straighten out the angle between the rearend and driveshaft in this pic . If your rearend to driveshaft angle is opposite to this pic , your 2 deg positive angle will change to about 4 deg positive when you launch .
Paul
Hey Paul. Figure 2 on the your link shows the tranny pointing up towards the rear and the pinion points down toward the front at an equal angle to make them parrallel. According to page 3 of this article
http://www.iedls.com/asp/admin/getFile.asp?RID=10&TID=28&FN=PDF almost all factory vehicles have the tranny pointing approximately 3degrees down toward the rear and the pinion pointing at an equal angle up toward the front...except for race cars which require the pinion to point down toward the front.
My scenario is more like figure 5 on page 4 with the exception my tranny is at 4, pinion at 2, driveshat at 0. If my tranny angle dropped to 2 and assuming my driveshaft stayed at 0, then both angles would be equal and cancel out any harmonic vibration tendencies.
I May shim my tranny up a degree but it is already 3/16" higher than original, unfortunately I only measured the tranny height and did not use an angle finder to see how the original set up was.
Installing Gear Vendors Over Drive in 74 AMX (Read 8083 times)
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