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Old 01-15-2022, 05:37 PM   #1
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Default older knuckle on 94 d21

I've been on here quite a lot and gotten a lot of answers from this site so i thought i'd make a profile and thank everyone for helping me and everyone else out!

I bought a 94 d21 as a project and learned it was much more of a project than i had anticipated. i recently replaced the cv axle and found out the previous owner replaced the knuckle, axle and locking hubs with ones off an older model after ordering 3 different cv axels for a 94.. and now the cv axle i replaced is binding when the 4wd is active. the truck is lifted 1.5 inches so i wouldn't assume the axle is too short for that small of a lift. can i get any advice on how to fix it? Do i need to replace the entire knuckle if i want to get the correct 94 parts?
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Old 01-17-2022, 06:45 PM   #2
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Welcome.
There are two spline counts that I know of because I ran into this on my 86.5. The 4 cyl versions had 27 spline while the v6 and some later 4 cyls had 29. There was also a difference when it came to the front diff. Again, 4 cyl and early models had the R180A while v6 and later 4 cyl got the R200A.
It could be that the PO changed the spindles and/or the diff.



Can you clarify what you mean by "binding"? Like what does it do and under what conditions...
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Old 04-14-2022, 01:01 AM   #3
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I haven't looked into difference between v6 and 4 cylinder, I'll have to look into that as well as a pathfinder axel. The 94 model has 28 splines and is 20.55 compressed and the 92 model which I ordered for has 27 splines and has a compressed length of 20.47. As for the binding, when I lock the hubs and drive it on the road, the joints in the boot are at too radical of an angle and bind and locks up. Would it be possible to simply add a spacer between the output and the axel? Or do I need to replace the entire steering knuckle and locking hubs?

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Old 04-14-2022, 02:06 AM   #4
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I would lean more to the knuckle like you thought. the length of the axle shouldn't matter. Nothing changes as the arms go up or down. If it did, manufacturers would have to install a slip joint in the half shaft.
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Old 04-14-2022, 02:18 AM   #5
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i just dont understand why its binding with the new axel, if its the same specs as the one the PO installed then it should be working. i replaced it because the boot was rotten and flinging grease all over and the joints began clicking but the 4x4 still worked. I want to do it right and put the correct parts on but i dont know where to begin.
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Old 04-14-2022, 02:12 PM   #6
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I would start by jacking up the front end, lock the hubs and spin the wheel to see where its binding. Turning the wheel left/right could help. With the hubs unlocked you can spin the half shaft to feel if they are binding.

Just because the half shaft is new doesn't mean that there isn't a problem.

So how do you know you have something binding?
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Old 04-14-2022, 11:07 PM   #7
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The wheel without the hubs locked spin just fine at any angle that I have the wheel turned, but when I lock them and engage the transfer case it binds even with the wheel straight. I know it's binding because before I finished the install I engaged the transfer case and spun the axel by hand and it spun freely, after I reassembled everything and locked the hubs I can only get a few degrees of rotation out of the tire before it locks up. If I can get spare time this weekend I'm going to try and tear into it again and see if there's any adjustments to the wheel angle or anything that might be at an odd angle
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Old 04-15-2022, 02:59 AM   #8
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Quote:
Originally Posted by Stephenm92 View Post
The wheel without the hubs locked spin just fine at any angle that I have the wheel turned, but when I lock them and engage the transfer case it binds even with the wheel straight. I know it's binding because before I finished the install I engaged the transfer case and spun the axel by hand and it spun freely, after I reassembled everything and locked the hubs I can only get a few degrees of rotation out of the tire before it locks up. If I can get spare time this weekend I'm going to try and tear into it again and see if there's any adjustments to the wheel angle or anything that might be at an odd angle
I've never worked on the 4x4 parts, but it sounds to me like you got something too tight.

On trailer axles, if the center spindle nut is on too tight, the wheel will not spin.

Good luck!
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Old 04-15-2022, 05:48 AM   #9
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I've torqued everything to specs so I'm really not sure what would be too tight, I'll look into that option though. Thanks for your feedback ��
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Old 04-15-2022, 03:06 PM   #10
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I've torqued everything to specs so I'm really not sure what would be too tight, I'll look into that option though. Thanks for your feedback ��
Sometimes it helps to watch a video. See if there is anything on YouTube about somebody doing what you are working on. You might see they are doing something different from you.

Just a thought.
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