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Old 11-18-2021, 03:06 PM   #11
ThunderChicken
 
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Quote:
Originally Posted by Reserector View Post
Try this:
Theory: If the t-case chain is OK, both driveshafts should rotate the same number of turns in any given distance because both diffs are the same ratio.


1. Find a place to test drive, put it in 4x4 and shut it off. Set the brake.
2. Crawl under and put a piece of tape of something on both driveshafts at the same clock position, such as straight up (12:00)
3. Now drive easy for a few yards, shut it off, look under and make sure they are still clocked the same (aligned, that is). This will prove the theory.
4. Now drive it to intentionally make is skip a few times.
5. Shut it off and check the tapes again.


  • If they are out of sync, it's your t-case chain.
  • If they are aligned, it's your diff, CV axles or a hub.


Cost= A bit of time, some tape and some laundry detergent to get your clothes clean after you crawl on the ground. LOL
That's a damn good idea, I'll try it and update the thread. I'm no stranger to getting some clothes dirty, seems worth it for some valuable information such as that.
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Old 11-18-2021, 03:46 PM   #12
Reserector
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You can check CV axles/hubs the same way. Put tape on both axles. Go STRAIGHT in 4x4 and make is skip. Check the tapes.


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Old 11-18-2021, 08:10 PM   #13
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The tapes told the tale, looks like I got a bad diff or cv on my hands. Gonna do the tape trick on the cv's next to see what I have to replace. I had a buddy ride passenger while I did the test and he felt the sound coming from the center area under the floorboards, so that's further evidence. The knowledge I gained from this saved me a ton of time, hopefully others can use this thread at some point. Luckily I'm not completely dead in the water and the 4x4 still works to get me unstuck while I find parts. I bought this truck for a project after all, can't complain too much.

Last edited by ThunderChicken; 11-18-2021 at 08:20 PM.
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Old 11-18-2021, 10:09 PM   #14
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how would a CV joint "skip"? its three giant ball bearings inside of a 3.5in deep cup.
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Old 11-18-2021, 11:06 PM   #15
cadillacdude1975
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I’m thinking a partially engaged auto hub….. then the axles splines have failed.
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Old 11-19-2021, 12:20 AM   #16
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Quote:
Originally Posted by street_rulerr View Post
how would a CV joint "skip"? its three giant ball bearings inside of a 3.5in deep cup.
The Birfield joints go bad. Had it happen once.
I had one that would click loudly when the truck was in a bind.

To test it, I butted the bumper against a tree and gassed it. Someone watched the axles and saw that one was turning at the diff, but not the CV shaft or outer stub. Inner Birfield was busted up.
I remember it was hard to see because the axle was jumping. A mark of some kind would have made it easy to see that it was spinning.

So it may be that simple. Keep diagnosing.
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