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Old 04-09-2012, 01:34 PM
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Exclamation Pinion Angle (Does this make sense??)

Ok, so I'm new to this whole SYE / Double Cardan CV shaft / Pinion Angle stuff. Last Saturday, I sucessfully installed my new Tom Woods SYE kit / CV shaft , however adjusting my pinion angle has proved to be a more difficult challenge that what was expected.... Having called Tom Wood this morning to get professional advice / help - I explained to him how I was going about getting my angle - and he quickly informed me that I was doing it all wrong... I was getting my first angle from the yoke on the new shaft. and trying to adjust my pinion to that angle WRONG!!! Per Tom, it has nothing to do with the shaft angle, just the drive shaft angle in relation to your pinion angle. While talking to him, I drew up this diagram. The link below will take you to the diagram in another post, see if this makes sense to any of you other professionals out there

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Old 04-09-2012, 05:29 PM   #2

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Just went through this with some help from Jerry B and yes, your diagram makes sense to me.

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Old 04-09-2012, 05:43 PM   #3
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Yes... in a perfect world, your drive shaft should be parallel to your pinon angle. Realistically, you want the pinion 1-2 degrees LOWER than your shaft angle. Why? two reasons.... if you have a 0 degree deflection between your shaft and pinion, the needles in the cups of the ujoints will not move enough to lubricate, thus premature failure. The second reason is axle wrap. Under load ( start off the line) your pinion loads up power and wants to climb upward. Being that our TJ's have upper and lower control arms, it's not that much, but the bushings still flex and that 1-2 low on the pinion can and will get to 0 degrees at one point or another... it won't stay there, but it gets there for a moment or two.

I hope that makes sense....
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