looking for pinion/yoke angles...
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Im trying to find any info on proper way to set pinion angle. Im swapping in a 14bff into a half ton 72 long box on about 4" lift running 350-sm326-205 if its relevent. I need to know:
What surface should my angle finder should be measuring from (the face of the yoke?)? What should the angle be relative to? the ground? the yoke at the transfer case? the driveline? Is the slope my truck is resting on, a problem in determining proper pinion angle? What do I need to take into consideration if so? Is the a General ideal angle? Thats about all... oh, one more. Its my understanding this measurement is to be taken at ride height? does it matter? (Im getting ready to weld on my perches and I dont want to put too much pressure on whilst unwelded and mocked up, Im not sure if it would hurt anything, but I hate finding out the hard way) Thanks in advance.:gmc2: |
Re: looking for pinion/yoke angles...
When I did mine I put the angle finder on the yoke. The idea is to get the angle finder flat with the yoke.
Now what type of driveline do you have? CV or Non-CV? CV = point the yoke straight at the Xfercase yoke Non-CV = Measure the Xfercase yoke angle and set pinion yoke angle within 3deg. Yes you want the weight of the truck on the axel so your springs are pressured by the weight. I run a CV type rear and I set my yoke 2-3deg down from straight at it, so when my 454 sends all that power to the rear and the yoke starts to stand up...well it was a theroy of mine to equalize axel wrap :sumo: :mm::chevy::mm: |
Re: looking for pinion/yoke angles...
"Lifted" 4x4s kind of throw a wrench into things with this....
"In theory" your pinion angle (at ride height) should be exactly opposite of the out-put yoke from the transfer case. The "Sticky" part comes in because of the lift. Most lift blocks are angled to tilt the pinion upward, lessening the "overall" angle of the driveshaft, but this "lessens" the angle of the rear joint more than it does the front. This is not "ideal" in the first place, just because the joints are no-longer "equally opposing", but it brings in other issues. First, it tilts the outer pinion bearing up and away from the gearlube. Second, on axles with the fill plug in the cover, it lowers the "fill level" by rotating the back of the housing downward, which makes the "pinion up" situation worse.... Most of all, never tilt the pinion upward to the point that the driveshaft is straight in line. The there needs to be some angularity between the pinion and the driveshaft, or the u-joint will not last long. |
Re: looking for pinion/yoke angles...
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Re: looking for pinion/yoke angles...
By the way - if any of you guys ever have the opportunity to drive your truck around without the pickup box on it - you should do so.
It is really amazing to look out the back window and see how much that pinion nose moves up and down during acceleration and deceleration. FWIW - K |
Re: looking for pinion/yoke angles...
Thanks a ton for the info guys.. I was feelin pretty lost. If you're ever in nor cal hit me up for a beer.:burnout:
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Re: looking for pinion/yoke angles...
its nice to find info like this..
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Re: looking for pinion/yoke angles...
It's nice to re-find info like this.
I've been looking for those. ;) |
Re: looking for pinion/yoke angles...
Not sure why so many have problems with this. If you get the pinion about 1-2 degrees less or more than the trans all should be good. Because of axle wrap, torque and suspension movement the angles constantly change. A good article on modified suspension drive shaft angles. https://4xshaft.com/blogs/general-te...veshaft-angles Note that terms like close are used. Exact is not mentioned. There are several other articles on the site on vibrations, etc. A working angle above 3 degrees will not kill the ujoint, just affects longevity. This is addressed in the article and the answer provided may surprise some.
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Re: looking for pinion/yoke angles...
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K |
Re: looking for pinion/yoke angles...
i have some work to do, and i will get this. right now rear axle is down 6degrees then 10 on the shaft to the carrier bearing then 5 on next shaft and 5 on t case. slip joint was off 1 or 2 teeth,
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