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Old 02-05-2021, 06:44 PM   #1
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Default LSD axle swap quiestions

My truck
1996, 4cyl, 5spd, 4x4 HG46 axle





Locally there is a LSD HG46 axle (same as mine supposedly) for sale thats been converted to a 2wd setup and disc brakes added from what i can tell. i dont THINK its a pathfinder axle but thats what im trying to discern. the claim is that its form a93 hardbody.



questions


1: how can i tell if this is from a HB or a pathfinder if the coil spring perches have been removed? as i understand it the pathy pumpkin is different dimensions than ours.



-maybe bolt count on the pumpkin where the diff attaches to the axle housing?



2: can someone tell me what the ABS sensor looks like and where it is? imagine youre standing at the transfer case, looking back down the barrel of the drive shaft. what "clock" position will it be and whats it look like?



3: can you just swap the third member or do i need to swap the axles too?



4: question 3 might be better asked as, are the spline count and diameter of the axle shafts the same across all years of 4x4 hardbodies?
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Old 02-05-2021, 07:06 PM   #2
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1. If it were a pathfinder axle I would expect to be able to see some physical signs that would indicate that the spring perches had been removed. Even if somebody was very careful and thorough there should still be some signs of the welds or a low spot where the welds were fully removed. I’d be quite impressed if they removed the welds and left no evidence of their presence.

2. For what it’s worth, and if I’m remembering correctly, the abs sensor on my sons 95 xe-V6 hardbody 2wd was at 9 o’clock looking aft from the front.
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Old 02-05-2021, 09:21 PM   #3
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3. Spline count changed from 31 to 33 in 99 or 00. Axle shafts are shimmed to the carrier at the axle bearing. That being said most tolerances are pretty close to each axle.
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Old 02-05-2021, 09:22 PM   #4
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3. Awhile back when I was looking for a replacement axle for my old truck, I thought I read you could just swap out the third member. I would have gone this route but I found out the axle housing was bent in an accident sometime in the past.

4. I thought the WD21 Pathfinder and D21 Hardbody had the same number of splines and the same diameter axle shaft. I believe it went to a bigger diameter with more splines with the Frontier/Xterra.

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Old 02-06-2021, 12:09 AM   #5
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Quote:
Originally Posted by alabama_lowlife View Post
1. If it were a pathfinder axle I would expect to be able to see some physical signs that would indicate that the spring perches had been removed. Even if somebody was very careful and thorough there should still be some signs of the welds or a low spot where the welds were fully removed. Id be quite impressed if they removed the welds and left no evidence of their presence.

2. For what its worth, and if Im remembering correctly, the abs sensor on my sons 95 xe-V6 hardbody 2wd was at 9 oclock looking aft from the front.

did the 93 have rear ABS on the 4x4's? i dont actually know what was standard. I do know that back then ABS existed but was normally an option or package thing. "No airbags or ABS. we die like men"
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Old 02-06-2021, 04:27 AM   #6
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My 94 has rear antilock brakes on the HG46 axle. I don't know what they look like, but they work like a champ. When I am pulling a heavy load and braking hard, the front wheels might lock-up, but the rear wheels never have.

I also have a 2000 2wd Xterra with the LSD axle. Both are HG46. The people in the Xterra group say the newer axles do not have good LSD features like the older ones had.

The Xterra is built like the Hardbody with leaf springs instead of coil springs like the Pathfinder uses.
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Old 02-06-2021, 10:16 PM   #7
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Quote:
Originally Posted by dvdswan View Post
3. Spline count changed from 31 to 33 in 99 or 00. Axle shafts are shimmed to the carrier at the axle bearing. That being said most tolerances are pretty close to each axle.



This is an odd question, whats the purpose of shimming? is it just to get maximum engagement of the axle to the differential or is it to make sure that the axle doesnt protrude too far out of the tube? im a little lost as to why it would take measurements in the thousandths vs goin "yah its in there and not bottomed out. k."
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Old 02-06-2021, 11:18 PM   #8
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It has to do with the contact pattern between the ring and pinion gears. Too tight, and the drive (inner) side of the ring gear will have excessive wear. Too loose and the coast (outer) side will wear. Same deal with the pinion depth and the crush sleeve on the pinion shaft. If you smear some contact paste on the gears they should contact each other at dead center or close to it.

A number of years ago I replaced the bearings in the differential because one of the pinion bearings was getting a bit noisy, and the pinion seal was starting to leak. Never again. I'll just roll the dice and get another rear end from the junkyard next time.
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Old 02-06-2021, 11:21 PM   #9
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nonono. this i understand. i mean the axle shafts and the diff carrier. not the "input" of the pinion vs ring gear, i mean the "output." why shim at the ends of the tube. these arent helical gears where the depth changes the engagement cause of the shape of the teeth. these are just splines in a splined hole
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Old 02-06-2021, 11:25 PM   #10
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My bad, I must have misunderstood. Are you talking about the shims on the outside the axle housing, behind the brake drums/backing plates? From what I understand those are for setting the rear wheel alignment.
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