pinion angle
May 12, 2015 | 09:37 PM
#12
The angle between the pinion and the driveshaft, and the tailhousing and the driveshaft should always be equal and opposite. The pinion and the tailshaft should also always be parallel to eachother. So if the pinion is set at -2 degrees to the driveshaft then the trans tailshaft needs to be +2 degrees to the driveshaft the resultant angle is 0 degrees. I just went through this with my truck which is lowered 7"s in the rear and ended up having to raise the trans mount 2-1/2"s and modify the engine mounts to make all the driveline angles happy again.
My understanding is they set the angles to be 0 offset under acceleration load. So the typical static setup seems to be anywhere from -2 to -4 degrees of pinion offset. Bear in mind these are strip only setups.
Aug 9, 2015 | 08:02 PM
#14
Bumping this back up for more info.
Obviously as power goes up, there's more force rotating the axle up hence the need for a larger pinion angle.
Now, does the pinion angle have an influence on how the truck will hook or is this all simply about reducing parasitic drivetrain loss?
I just measured my pinion angle at -2.5 degrees and I'm wondering if my axle is rotating up on launch with a positive pinion angle potentially 1 of the reasons I can't hook off the line?
Obviously as power goes up, there's more force rotating the axle up hence the need for a larger pinion angle.
Now, does the pinion angle have an influence on how the truck will hook or is this all simply about reducing parasitic drivetrain loss?
I just measured my pinion angle at -2.5 degrees and I'm wondering if my axle is rotating up on launch with a positive pinion angle potentially 1 of the reasons I can't hook off the line?
Aug 9, 2015 | 08:29 PM
#15
Launching!
Joined: Feb 2012
Posts: 273
Likes: 11
The angle between the pinion and the driveshaft, and the tailhousing and the driveshaft should always be equal and opposite. The pinion and the tailshaft should also always be parallel to eachother. So if the pinion is set at -2 degrees to the driveshaft then the trans tailshaft needs to be +2 degrees to the driveshaft the resultant angle is 0 degrees. I just went through this with my truck which is lowered 7"s in the rear and ended up having to raise the trans mount 2-1/2"s and modify the engine mounts to make all the driveline angles happy again. Granted I should mention that I've seen some pinion angles in drag racing that defy logic, but work for some people.
Aug 9, 2015 | 10:02 PM
#16
Launching!
Joined: Feb 2012
Posts: 273
Likes: 11
Bumping this back up for more info.
Obviously as power goes up, there's more force rotating the axle up hence the need for a larger pinion angle.
Now, does the pinion angle have an influence on how the truck will hook or is this all simply about reducing parasitic drivetrain loss?
I just measured my pinion angle at -2.5 degrees and I'm wondering if my axle is rotating up on launch with a positive pinion angle potentially 1 of the reasons I can't hook off the line?
Obviously as power goes up, there's more force rotating the axle up hence the need for a larger pinion angle.
Now, does the pinion angle have an influence on how the truck will hook or is this all simply about reducing parasitic drivetrain loss?
I just measured my pinion angle at -2.5 degrees and I'm wondering if my axle is rotating up on launch with a positive pinion angle potentially 1 of the reasons I can't hook off the line?
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