Pinion Angle

[geegers]

I have read many of the posts regarding how to set the pinion angle and hoping that I have done the adjustments correctly, but not confident that I completely understand it.

My MK4 has a 427 c.i. Ford engine and a 5 speed Tremec trans. I needed to add a ~1 inch spacer under the trans mount. The trans was set at 2.00 degrees down; the diff 1.65 degrees up, and the transaxle (spline) reads 2.70 degrees down. This yields an OA1 of 0.7 degrees and an OA2 of 1.05 which meets the rules of less than one degree difference between OA2 and OA1 and less than 3 degrees for the sum of OA1 and OA2. Am I off or on target with these values?

[CraigS]

How are the trans and the 'transaxle (spline)' at different angles?

[scrubs]

https://spicerparts.com/calculators/driveline-operating-angle-calculator

[geegers]

Thanks for responding. Here is a schematic of the set-up showing all angles are negative--trans, driveshaft and diff and parallelism between trans and diff. The calculator has the input values I mentioned in my original post. The ride height selected puts the trans just slightly higher than the diff.


191153

[CraigS]

I'd be fine w/ that. Your engine/trans is within .35deg of being parallel w/ the diff which IMHO is way inside acceptable limits. Heck, solid axle setups usually have the diff pointed down 1-2deg so, as everything flexes under full accel, the diff nose comes up to get it parallel to the trans. So 99% of the time the axle is running at that 1-2deg angle.

[geegers]

Thanks, CraigS, for your confirmation on the diff angle before and during acceleration being within operating limit.