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Discussion Starter · #1 ·
I think I'm having pinion angle problems. I know its been covered before but the one tutorial I know about, the link doesn't work anymore. So I have a 87 S10 ext cab with a 2 piece drive shaft. I used the KP canti kit for the rear. My pinion yoke at ride hight is higher then the Carrier bearing so he drive shaft makes a "V" shape. What am I supposed to reference my pinion angle against?? The tranny tail shaft, or the 1st section of the drive shaft, or the 2nd section of the drive shaft. Once i know that am i supposed to match it to that reference point or what. I am confused......
 

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You do not want your drive shaft perfectly straight. You need to take the degree at the transmission tailshaft, and invert that number for your pinion ( ex. tranny = -2 degrees.... pinion should be +2 degrees ) if you have a carrier bearing you will adjust it to the height to where it splits the difference of the two angles. This is how you get cancellation.......
 

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You do not want your drive shaft perfectly straight. You need to take the degree at the transmission tailshaft, and invert that number for your pinion ( ex. tranny = -2 degrees.... pinion should be +2 degrees ) if you have a carrier bearing you will adjust it to the height to where it splits the difference of the two angles. This is how you get cancellation.......
does this apply if the pinion is lower or higher than the trans shaft?
 

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if you have a carrier bearing you will adjust it to the height to where it splits the difference of the two angles. This is how you get cancellation.......
Can you elaborate on that a lil bit. I've been tryin to research this shit for a long time, and I can't find nuthin on pinion angles with carrier bearings. The way mine is setup, is the if you look at driveshaft from the side, the angle at the tranny and angle at the diff are opposite, and the carrierbearing is spaced so the two drivelines appear to be in a straight line. is that correct??
 

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Here's somethin I found... but somehow, no matter how many times I read it, I still can't picture it...

The general rules regarding pinion angles are that they be at the same angle as motor and transmission. Professional installers will measure the motor angle at the output shaft of the transmission, using the frame as a reference. After the new suspension is installed, they will make sure that the pinion angle is within four-to-five degrees of the original measurements.

Furthermore, if your truck is equipped with a two-piece drive shaft, the center carrier bearing must also be altered to help maintain proper pinion angle and drive shaft operation. Typically, the two rear u-joint angles must be equal to each other within 5 degrees or less. The front shaft u-joint between transmission and the front shaft should be within ½ degree of transmission angle. The rear end pinion angle should also be equal to or fall in between front shaft and transmission angles. Overall, any of the drive shaft angles should not have a variance larger than four degrees of total working angle.

Likewise, all of the u-joints should be in phase with each other. This means that if you look at the drive shaft under the vehicle, all of the u-joints should be parallel to each other. They should also be sitting straight up and down. If your truck had a vibration or shimmy before the installation of a new suspension system, it will no doubt get worse. If this is the case, you can take your drive shafts to a specialist who will check the shaft’s run out. The general rule of thumb is that a drive shaft should not have more than .010 run out at the center of the shaft.
-http://ten.ewzone.com
 

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Discussion Starter · #9 ·
So I guess I basically have to figure out how to make the drive line not go up hill and at the same time make the the tail shaft and pinion angles opposite each other and split the dif with the center joint???
I cant be the 1st person to run into these problems. Please if anyone has been threw this let me know what you did to fix it. I'm getting a funny noise out of the back and and a vibration when i drop the rear....
 

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Im not really sure but i think there is a X-member that does shims it for you.. its not really expensive i think around 70bucks.. scroll down a little bit in the baggin forum and its by DMO Fabrication.


hope i helped!
 

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No problem i PMed him and asked if it fixed driveline vibratoins.. and ill post here when i get the PM!
 

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I know exactly what the carrier bearing x-member does, but it is for those people who have a 98+ truck where the x-member hangs below the frame too much, where as on the pre 98's, it only comes down like a 1/4" below the frame... which ain't much.

Yes it is meant to fix geometry and vibrations. I can tell ya that. However each setup is different, and at ride height is where all of this needs to happen, and ride heights very. They way mine is done, is I just bought a spacer off one of the guys on the forum here. Member 'joe'. It is a block of aluminum with holes cut in it for the bolts, and he sends ya new bolts too. Raised the carrier bearing 7/8", and I no longer have driveline vibrations. I just need to get my u-joints replaced.
 
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