Way Outta Control
Join Date: Sep 1999
Location: The Palouse
Thanked 3 Times in 3 Posts
Re: Drive shaft fell out...again..suggestions
1. I'd doubt 1/2" shackle lift would cause a problem.
2. If the thread lock is shakin' loose, yep, ya got a problem.
3. As a rule, there should be a small punch mark on.
a. the driveshaft
b. And the yokes.
4. Phasing: The punch marks should be aligned.
a. A U-joint has 2 yokes connected by a cross.
b. The yokes must be 90 degrees apart.
c. When you connect the slip joints together you make 2 parts into 1. Make sure that when you re-connect the shaft together the splines are alinged correctly.
d. On this shaft the yokes at each end need to line up exactly.
e. Look at the other shaft and see how they line up on it.
f. This minimizes end thrust introduced by U-Joing angle at developed by the 2 ends.
g. Endwise motion of the slip joint is minimized.
h. When the u-joints are in standard phase, the slip yoke lugs (ears) and the tube yoke lugs (ears) are in line.
i. This is the ideal for a smooth running shaft.
j. In simpler words, if the zerk fitting on the front U-Joint is 6 o'clock, the zerk fitting on the rear U-Joint should be at 6 o'clock.
5. If the Yoke's were bad then you sure could have a problem.
6. Double check the Yokes for
b. Out of position,
c. Smooth rotation,
d. No exessive in - out play from the Transfer case or diff.
7. Checking the angle is simple: The two angles MUST be withing about 2* of each other.
Measure the angle from the transfer case to the driveshaft and it's a - 11 degrees
Then to avoid vibration the angle from the driveshaft to the Diff must be betwen +11* and + 9*
By subtracting the two angles you get the result, so if the subtraction yielded a result of 4*, then the vibration occurs.
The larger the difference between the two angles, the more vibration. The more vibration the faster the destruction of the parts.
8. If your tires are large then there's more footprint applied the the earth surface. It's like more firmly planting your foot on the earth and now twisting... if the foot don't move, something's gonna give and it's likely the ankle or the knee and you're gonna fall, grab something and scream in pain. You're Jeep may not be able to scream and grab in pain, but it can sure scatter parts.
9. Same prolem happens with a larger engine and stock driveline parts. You can overpower the driveline parts and scatter U-Joints everywhere you go.