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Pinion angle
Topic Started: Dec 27 2012, 08:57 PM (750 Views)
JROD CJ53
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I'm trying to find out what my pinion angle needs to be for my dana 44. I took off a spring over lift and I am trying to align the axle on new spring perches. I have heard that the angle needs to be 0 degrees. I'm guessing this is meaning that the yoke will face forward and be 90 degrees perpendicular to the ground?

Where do I need to put the angle finder to measure? on the yoke?

I have the wheels on the axle and everything tight in place but not welded yet.

I'm sorry if this is a double post. I tried to post earlier today, and its not on the page.
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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oldtime
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In order to eliminate propeller shaft vibration the upward angle (from D44) must equal the downward angle (from D18).
Angles must be equally opposite plus or minus 2 to 3 degrees.
Take your angle measurements at the normal curb weight.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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JROD CJ53
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Where on the shaft do I need to measure? near the linkages? do I measure on top and bottom of the shaft itself? or take the measurement on both sides. Im guessing if they are both in line, it wont matter just be the opposite from top to bottom, correct?
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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oldtime
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Remove the propeller shaft.
Measure the angle of the D18 rear output companion flange relative to a level plane.
Then measure the angle of the D44 pinion yoke relative to a level plane.
If the companion flange tilts down so many degrees from level ...
then ideally the pinion yoke is tilted upward from level the same number of degrees.
Plus or minus 2-3 degrees of synchronicity will eliminate the vibrations eminating at the oscillating Cardan cross trunions.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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JROD CJ53
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Very clear instructions as always. I understand now. Thank you very much.
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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JROD CJ53
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I took the propeller shaft off and measured the angles,

Posted Image

Here is the angle at the companion flange. I got a reading of 0 degrees. I am resting up against the nut, does the nut need to come off first?

Posted Image

The second photo is the measurement at the yoke. It is at 10 degrees. By what you have explained, the yoke needs to be angled down to the floor until it reads 0 degrees as well, correct?

Thank you again for your time in explaining this to me.
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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oldtime
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Let me add some more some more so eveyone understands.
The jeep itself must be on the level plane, in other words a perfectly flat surface.
Otherwise the whole jeep is tilted thereby effecting the companion flange and pinion yoke readings.
If needed place two identicle shims onto the companion flange so that the end of the output shaft can not interphere with flat mounting of the angle finder.

Then if the jeep is at "normal" curb weight the angle finder readings should ideally concur.
By "normal" I mean as typically expected to be loaded.
Now realize that as the jeep is loaded the rear axle angle will change.
As weight increases over the rear axle the pinion angles further.
I never checked to see exactly how far it moves but its quite noticable.
Perhaps you would like to perform a small yet very important experiment for us all.

EXPERIMENT TO DETERMINE REAR PINION ANGLE CHANGE RELATIVE TO LOADING

First indicate the condition of the rear leaf springs.
A pic of the shackle angle and a leaf count should suffice.
Standard rear leaf count is 9 leaves per spring.

Place Jeep on level surface fully unloaded at "curb weight".
Check the rear pinion angle.
Now place about 750 pounds in the bed or better yet load until the axle snubber clears the axle tubes by only 1 inch.
Loading to 1 " snubber clearance provides the absolute maximum loading of a vehichle.
Again recheck the pinion angle.
That provides us with the rear axles full range of motion.
From that one can best determine the ideal angle at curb weight.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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JROD CJ53
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I live in Florida, so we're pretty flat as is. I think my house is about 12 feet above sea level. My jeep is in my garage which is as level of a surface as I can find. As for the weight...
I have 9 leaf springs, but am not sure on if they are stock. The PO had a lift kit on at one point which leaves(no pun intentded)me to believe that the leaf springs are after market. They are thicker than others I have seen.
I have the axle loaded, but I will try to see if it changes before I weld. Spent the day rewiring a plug so I can have my borrowed welder work. On shift tomorrow, so ill check for changes on Monday when I get home... Thanks again
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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JROD CJ53
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Here are the pictures you asked about of the springs and spring shackles. They are pictures before and after the spring over lift removal. I didn't switch out the springs or shackles. I took them off, cleaned all the surface rust and clay off, and spray painted them. You may see in the second picture that the spring shackles have some extra bend in them. I'm planning on switching these out for H style shackles.

You will also see the level surface of the garage floor I spoke of.

Posted Image

Posted Image
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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JROD CJ53
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I have the U bolt nuts loosened to adjust the pinion angle. I loosened them just enough to be able to move the axle into final position. I can at this point move the axle to any position to make the angle what I want it to be. Should it put it to 0 and tighten down the U bolts then test? or should I weld my spring perches into final position before testing?

1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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oldtime
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Your garage floor is plenty flat enough for all practicle purposes.
I mainly wanted to note that we need a level surface as standard reference to compare the two angles of the jeep's propeller shaft.

Yes I too suspect that your leaf springs are aftermarket.
This implies that your particular jeep is not a good candiate to determine the factory angles of the propeller shaft.

My own daily driver is an excellent candidate to determine both the factory curb weight and the maximum loaded angles.
The problem is that I do not have an angle finder like the one you have.
That's an excellent tool for this purpose.
If I had such a tool I could readily determine the factory standards for the angles in question.

Can someone else having both a standard sprung 3B and an angle finder determine the factory curb and loaded standards ?
It would be very helpful to determine the unknown factory standards.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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JROD CJ53
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with those springs, do the angles still need to be the same to minimize vibration?
1953 CJ3B/F134 rebuilt with 6000 miles/ Dana 25 front, 44 rear/ T90, Spicer18/ YF 938SD/12V conversion . Tarpon Springs FL
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oldtime
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Yes.
All propeller shafts with single Cardan cross universals ideally should be equalized front to rear by plus or minus 2 to 3 degees.
This is all because the single Cardan cross type of universal joint is not a constant velocity universal joint.
True constant velocity universal joints like the "Rzeppa" joint do not produce any oscillating vibrations.
Currently building my final F-134 powered 3B .
Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
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