Correct drive shaft angles
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Cross-Country
Joined: Oct 2017
Posts: 84
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Correct drive shaft angles
Single drive shaft truck.
Engine/ trans angle is 3.3 degrees down from the front
drive shaft angle is 6 degrees down from the front.
Diff pinion angle is 2 degrees down from the front
So doing the math the front joint angle is 2.7 degrees
Rear unjointed angle is 4 degrees.
difference between front and rear joint angles is 1.3 degrees.
this seems close to optimal.
Under load the pinion should move to 4 degrees pinion angle.
This would put the front joint angle still at 2.7
Rear would be 2 degrees.
This all looks good to me.
I did the math with a 5degree driveshaft angle (load in the box) All still looked good.
Let me know of your thoughts everyone.
Thanks in advance
Engine/ trans angle is 3.3 degrees down from the front
drive shaft angle is 6 degrees down from the front.
Diff pinion angle is 2 degrees down from the front
So doing the math the front joint angle is 2.7 degrees
Rear unjointed angle is 4 degrees.
difference between front and rear joint angles is 1.3 degrees.
this seems close to optimal.
Under load the pinion should move to 4 degrees pinion angle.
This would put the front joint angle still at 2.7
Rear would be 2 degrees.
This all looks good to me.
I did the math with a 5degree driveshaft angle (load in the box) All still looked good.
Let me know of your thoughts everyone.
Thanks in advance
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Sorry to intrude but while I can't lend anything to this discussion Mercury100 how were you able to measure your angles especially of the transmission and differential? Just curious is all...........
TIA
TIA
Thread Starter
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Cross-Country
Joined: Oct 2017
Posts: 84
Likes: 6
For the engine and trans. I measured from the floor to the Center balancer bolt on the front of the engine. Then measure from the floor to the centre of the trans output shaft. Then measure the distance on the floor from where you measured the front crankshaft bolt to the trans. Plumb bob and a jiffy marker works for this.
Then do good old trigonometry to find the angle.
I used my cell phone for the driveshaft angle.
Removed the driveshaft rear ujoint from the diff and used the flat flange area on the diff yoke and my cell phone and got the diff angle.
Then do good old trigonometry to find the angle.
I used my cell phone for the driveshaft angle.
Removed the driveshaft rear ujoint from the diff and used the flat flange area on the diff yoke and my cell phone and got the diff angle.
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