pinion angle @ ride height

[Sick5]

I get a vibration after 50.
I have dropmember installed and my angles are
Starting from the tranny
Tranny 4
Shaft. 3
Bearing. 0
Shaft. 6
Differential. 0
This was at ride height 5in

I have a 2 inch block under the bearing. Any info would be gratefully
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[Robznob11]

Im assuming that your tranny is down 4* and your pinion is at zero! if this is correct then it sound like you need a 2* shim under your rearend! to be equal and opposite tranny would be down 4* and pinion up 4* but it is recommended that your pinion be 2* down so the pinion can climb under tq so a 2* shim would put it 2* up. witch is 2 down from tranny. hope that makes sense!

[Sick5]

Thanks
Tranny down 4
First shaft. Down 3
Center bearing 0
Second shaft up 6
Differential. 0
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[Sick5]

Wouldn't that bring my shaft at 8 well the rear shafy
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[Robznob11]

I just relized that you had a two piece drive shaft so my suggestion is probably not correct. I do know that you want to keep the u joints with in a 2* operating range and that its best to have the angles at each end equal and opposite. I would think that you would need to take an measurement of the face of the carrier bearing to see if it is tilted and then adjust according to that so if the tranny is down 4 the front side of the bearing should be tilted up 2 meaning the back would be down two and the pinion should be 0 but maybe someone else will chime in. my self I think I would convert over to a one piece shaft and eliminate balance issues and bearing issues. also if im not mistaken I think that if the u joints are replace in either shaft they have to be clocked correct for the driveline to run the way it was balanced. maybe someone with more 2 piece knowledge will chime in. sorry for the confusion. the actual angle of the shafts is not as important as the angles on either end!

[Robznob11]

Originally Posted by Robznob11

I just relized that you had a two piece drive shaft so my suggestion is probably not correct. I do know that you want to keep the u joints with in a 2* operating range and that its best to have the angles at each end equal and opposite. I would think that you would need to take an measurement of the face of the carrier bearing to see if it is tilted and then adjust according to that so if the tranny is down 4 the front side of the bearing should be tilted up 2 meaning the back would be down two and the pinion should be 0 but maybe someone else will chime in. my self I think I would convert over to a one piece shaft and eliminate balance issues and bearing issues. also if im not mistaken I think that if the u joints are replace in either shaft they have to be clocked correct for the driveline to run the way it was balanced. maybe someone with more 2 piece knowledge will chime in. sorry for the confusion. the actual angle of the shafts is not as important as the angles on either end!

looking at your last post if the tranny is down 4 and shaft is only 3 that would indicate its running up hill, I would shim up the tranny first to see it that clears it up. it should only be 2-3 down anyhow

[Daaaanz67]

Do a search for 2 piece drive shaft angle help think I read something on there before.
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[Sick5]

Thanks Dan
I was thinking of giving dave from PB call
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[Hart_Rod]

Can u post pics of your setup?
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[ItsRandy]

Look here: http://www2.dana.com/pdf/J3311-1-DSSP.pdf , you can print it for your future use. Great information.

[69gmcc10]

Originally Posted by ItsRandy

Look here: http://www2.dana.com/pdf/J3311-1-DSSP.pdf , you can print it for your future use. Great information.

Read page 14 in this thing.

[Reyals Bemus]

For your consideration, the pinion doesn't really "climb" under torque in these trucks because of the trailing arm suspension design. Unlike leaf sprung rear ends, the axles in our '60-72 C10s are positively mounted to the trailing arms. They cannot twist or wrap up like leaf sprung axles. The only pinion angle changes that occur is under normal suspension travel, but due to the inherently long trailing arms, the angle change is, again, minimal.

All said, I like to set mine up close to 0 or 1 degrees (no more than that) in these trucks. Smooth as buttah!

[Robznob11]

Originally Posted by Reyals Bemus

For your consideration, the pinion doesn't really "climb" under torque in these trucks because of the trailing arm suspension design. Unlike leaf sprung rear ends, the axles in our '60-72 C10s are positively mounted to the trailing arms. They cannot twist or wrap up like leaf sprung axles. The only pinion angle changes that occur is under normal suspension travel, but due to the inherently long trailing arms, the angle change is, again, minimal.

All said, I like to set mine up close to 0 or 1 degrees (no more than that) in these trucks. Smooth as buttah!

well I hate to differ but, one would think because the axle is positively mounted it would not move much. but you have to take into consideration that all iron flexes at some point and the frame will move and twist as well as the suspension. that is why when you see cars pull the wheels coming off the line one tire is higher in the air than the other unless it is a boxed full race chassie. we are talking about a stock c channel frame here with add ons and believe me when I say it will move a lot more than you would like to give it credit for if those tires bite. it is not good to not have to not any angle in the drive line, u joints are made to run at an angle but with in a range. im out on this one but you all should really look over a lot of web pages because pinion angles have been debated for years!

[Sick5]

Check out my thread
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[Sick5]

Nate need your help......

[PBFAB.COM]

Originally Posted by Sick5

Nate need your help......

Call us at the shop tomorrow. Dave should be able to help you out, but you can leave a message for me to call you back if you would like.

Nate
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[69gmcc10]

Drives train angles should have a 1* to 2* relationship with the adjoining drive train part to prevent excess wear in the universal joint. As you accelerate a leaf spring vehicles pinion can move as much as 2 deg, a trailing arm vehicle will move .5 deg. Your first drive shaft and the pinion should be on the same plane meaning that you need a pinion angle of 4 degrees. This will also keep all of your angles within 2 deg of each other. There is adjustment on your PB drop member where the trailing arms bolt and if you still have them mounted in the bottom hoes like in you build thread they need to come all of the way up to the top mounting holes in hopes that this will get you the 4 deg pinion angle you are looking for.

Good luck

[Sick5]

Let make sure I have it right. The tranny and the first shaft are cool. I need to move the differential and the the second shaft. And moving the trailing arms up would move my second shaft to 4. But wont my differential move out of 0
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[69gmcc10]

OOPS! I mean 3 deg on the pinion angle, sorry. Engine/trans and first drive shaft seem fine to me. From what I can tell all you need to do is adjust the pinion angle to 3 deg by raising the mounting pint on the cross member and the second drive shaft will be fine.

[Sick5]

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But will there be a problem with the differential change of pinion angle
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[Robznob11]

Well im no 2 piece expert but i would think the two lines would be set seperate from each other usually the front shaft is near level and the rear drops meaning they have way different angles. On the rear if the pinion is zero and bearing is zero and the shaft is at an angle they are equal and opposite therefore happy! I think the problem is in the front my self! Also leafs can wrap up to 7* depending on power and trailing arms and ladders etc usually less than 2 but it is the common practice to set the pinion down 2* for wrap up on race cars they go alot more. My guess it that if the tranny is 4 d and shaft is 3 and bearing is 0 then a shim under the tranny would bring the problem to a min. But thats just my .02
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[Sick5]

Dont matter just need it fix. Ive emailed and left a msg tuesday I believe. Ill call back today around 1030
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[Sick5]

I moved the center bearing around half and inch. Vibration is still there but not as bad.
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[shawno72]

Is it only over 5o mph? Any vibes on take off or hard acceleration?

[Sick5]

None
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