Do you have an NP231 with the Slip Yoke?
You mentioned that you rotated the tires but did you have the tires balanced also?I adjusted the pinion angle. Best I can measure it's about 0.8*.
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Vibes are the same. I rotated the tires and no change there.
Vibes are definitely more pronounced under load. Going up hill the vibes are much worse than coasting down hill at the same speed.
In 4wd the vibes are less. Not sure what to make of that. May be reduced load on the rear driveshaft.
I guess next step is the pull the rear driveshaft to confirm that's the problem and inspect as best I can.
no just swapped front to back, flipping l/r on the rear. Idea is that if the unbalanced tire is in the front I'd feel it in the steering wheel, but I never did. Also a good thing to do to keep tire wear even, so I figured it was worth doing either way.You mentioned that you rotated the tires but did you have the tires balanced also?
I'm interested in what you find here as I'm dealing with a similar situation.
Personally it's only the front axle u-joints I'd worry about with respect to strength but everybody has different needs. I ran Moog in the front and they wore out quick but for the driveshaft I wouldn't worry.
Little clarity plz..
One of the ujoints was shite, did you replaced bad one and discovered that you still had vibes, thus you went further to replace center ball?
Or did you replaced ujoint, vibe went away, and then you decided to refresh entire double joint, thus the 5 week wait and center ball has nothing to do with the vibe?
I'm not sure JB Weld would do the trick given the greasy environment you're dealing with? Were you able to recover any remnants of a grease fitting from the hole? Did the fitting snap off leaving the threaded portion inside? If there's any remains of a fitting left behind you should be able to extract it and install a new fitting. Judging by the dent in the photo, it looks like the shaft took a hit dead center on where that grease fitting once lived. It's possible that threaded hole has been distorted now rendering the threads useless. Does the splined end still travel freely? If so you can always just pull the shaft apart and apply grease by hand, then reassemble. The grease fitting isn't essential, it just makes it easier to add grease and keep dirt out. Your main focus is allowing the splines to travel freely so there's more than one way to keep it greased. If you're able to salvage the threaded hole I'd recommend switching to the flatter needle-style fitting. Good luck to ya, I say RUN IT!After all this time I've FINALLY fixed the vibes! 5 weeks waiting on the centering ball, only to find I ordered the WRONG PART like an idiot. Sent it back and the right one came in and NO VIBES! Hallelujah!
The slip spines are missing the grease nipple:
View attachment 267916
Looks like it got torn off. I put a new one on but it wouldn't hold. Seems like this is a job for JB weld. Any other ideas?
I'm not sure JB Weld would do the trick given the greasy environment you're dealing with? Were you able to recover any remnants of a grease fitting from the hole? Did the fitting snap off leaving the threaded portion inside? If there's any remains of a fitting left behind you should be able to extract it and install a new fitting. Judging by the dent in the photo, it looks like the shaft took a hit dead center on where that grease fitting once lived. It's possible that threaded hole has been distorted now rendering the threads useless. Does the splined end still travel freely? If so you can always just pull the shaft apart and apply grease by hand, then reassemble. The grease fitting isn't essential, it just makes it easier to add grease and keep dirt out. Your main focus is allowing the splines to travel freely so there's more than one way to keep it greased. If you're able to salvage the threaded hole I'd recommend switching to the flatter needle-style fitting. Good luck to ya, I say RUN IT!