skep419
5.9 Magnum 4 speed afficionado
The trans is -1 and rear pinion is +1 What would you do to fix it. Have the 3" inboard kit but didn't plan on installing it until next year when I can afford wheels and tires.
Wording can get misunderstood, but this exaggerated representation should help. Looking from the side with the trans on the left, the driveshaft is usually at a "down angle" from the trans to the rear and then the pinion would be angling up - relative to the driveshaft.
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When talking about "pinion angle", it is the angle at the bottom, between the pinion on the right and the driveshaft on left (represented by the downward slashes). The angle difference between the trans output shaft and driveshaft is not used in pinion angle computations. But adjusting the pinion angle can slightly alter the trans-to-driveshaft angle.
Hope this makes sense. It's past my bedtime! lol
Gosh darn, heck. Couldn't get the lines and slashes to stay where they need to be.
The transmission measurement is to get the centerline. The reason to adjust the pinion to -5 below centerline is because the leaf springs are going to allow the rear end to lift 5 degrees. After they lift 5 degrees it should be parallel to the trans. Right now my trans is at -1 and the rear end is +1 meaning it is a perfectly parallel. In order to get -5 down pinion angle the rear end will have to be positioned to -4 degrees down instead of +1 (1-5= -4) Once the -4 degrees is reached when I smash the gas and the pinion lifts 5 degrees the driveline is parrallel.
Pinion angle is the difference between the pinion yoke/shaft and driveshaft. That needs to be measured and adjusted - if needed.
-1* between the trans and driveshaft is good. Mopar book says 2.5* or less, but not "0".