Rear Differential Carrier Bearing - timken part #? - Defender Source
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  #1  
Old October 27th, 2012, 09:15 AM
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Rear Differential Carrier Bearing - timken part #?

Redoing the rear differential (inner/outer pinion bearing as well as the carrier bearing). Got the numbers ok for the inner/outer pinion, but finding conflicting information for the carrier bearing - looking to cross-reference to a Timken if possible.

I've found that Timken 387A/382A (bearing/race) as well as LM102949/LM102910 (bearing/race) are listed as possible part numbers for the rear diff.

Can anyone confirm the correct carrier bearing for a 1994 NAS 90?

Also worth noting that I am running ARB lockers and 24-spline axles (in case that changes things).

I'm obviously not in front of the diff at the moment.
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  #2  
Old October 27th, 2012, 09:41 AM
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Found this spec sheet on ARB's website, pretty sure the correct are (2) of the LM102949/LM102910:
http://www.arb.com.au/media/products...ckers/5-14.pdf
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Old October 27th, 2012, 10:06 AM
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For posterity:
Differential Carrier Bearing - LM102949 (2 needed)
Differential Carrier Race - LM102910 (2 needed)
Pinion Bearing, inner - HM801346X
Pinion Race, inner - HM801310
Pinion Bearing, outer - M88046
Pinion Race, outer - M88010

Most available through Napa/etc, all available through Amazon, and I'm sure some places carry the full "rebuild" kit.
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  #4  
Old October 31st, 2012, 08:32 PM
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Actually now I'm not so sure about the Carrier Bearing/Race for the rear differential. I *thought* it was the LM102949/LM102910, but now from research it could be LM501349/LM501310.

Can anyone confirm: correct Carrier Bearing for Rear Differential on a 1994 NAS 90?
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Old October 31st, 2012, 09:18 PM
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it has been so long since I have worked on a rover diff, I cant remember the actual part numbers... last kit was purchased at a/b.
prior kits came from great basins... the carrier bearings are extremely common especially in eaton fuller manual transmissions as fitted to big trucks... locally at "transaxle" in springfield.
the rear pinion bearing is less common so harder to find... the front pinion bearing is unique to rovers due to the taper thus it becomes a rover only specialty.
in the long run better off biting the bullet and getting the complete differential bearing overhaul kit from a/b, it includes the shims and seals.
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Old October 31st, 2012, 09:21 PM
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Quote:
Originally Posted by carlosz View Post
it has been so long since I have worked on a rover diff, I cant remember the actual part numbers... last kit was purchased at a/b.
prior kits came from great basins... the carrier bearings are extremely common especially in eaton fuller manual transmissions as fitted to big trucks... locally at "transaxle" in springfield.
the rear pinion bearing is less common so harder to find... the front pinion bearing is unique to rovers due to the taper thus it becomes a rover only specialty.
in the long run better off biting the bullet and getting the complete differential bearing overhaul kit from a/b, it includes the shims and seals.
AB doesn't do the bearing kits any longer. I'll head to the driveline shop in the morning to see if I can get it from there and report back.
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Old October 31st, 2012, 09:23 PM
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ok... see what I meant by "it has been so long"... dang Im loosing my touch. it is agony getting old.
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Old November 1st, 2012, 05:04 PM
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So in my never-ending quest to realize Rovers are never easy going, turns out that the carrier bearing is actually different on each side in the rear differential. Did not know that...and apparently neither do the places where you order the "kit" from (judging from my kit that arrived but had matching carrier bearings, which was not correct).

So....here goes the REVISED for posterity (NOTE: the carrier bearings are different on each side!):
Differential Carrier Bearing (first side) - LM102949 (1 needed)
Differential Carrier Race (first side) - LM102910 (1 needed)
Differential Carrier Bearing (second side) - LM501349 (1 needed)
Differential Carrier Race (second side) - LM501310 (1 needed)
Pinion Bearing, inner - HM801346X
Pinion Race, inner - HM801310
Pinion Bearing, outer - M88046
Pinion Race, outer - M88010
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  #9  
Old November 1st, 2012, 05:42 PM
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Which is the first side and which is the second side on the carrier? There's no mention of siding in the workshop manual.
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Old November 1st, 2012, 07:15 PM
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Quote:
Originally Posted by Baldewin View Post
Which is the first side and which is the second side on the carrier? There's no mention of siding in the workshop manual.
Yea this is news to me as well. What's different about the bearings??
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Old November 1st, 2012, 07:21 PM
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Every rover diff I've rebuilt had matching bearings and races factory installed and replaced with matching bearings with no issues. What's the difference in the bearings? A slight width difference?
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Old November 1st, 2012, 07:47 PM
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Quote:
Originally Posted by Wolf Fabrication View Post
Every rover diff I've rebuilt had matching bearings and races factory installed and replaced with matching bearings with no issues. What's the difference in the bearings? A slight width difference?
Every diff I have built had matching bearings left and right. Except Toy E-locker but that's an entirely different bearing all together.

Justin at L8 doesnt have all of this information/in stock??
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Old November 1st, 2012, 08:01 PM
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As I can tell, the LM102949/LM102910 is on the passenger side of the diff & the LM501349/LM501310 is on the driver side of the diff. That's how it came out, which I verified and saw with my own eyes - hence we matched everything up to exactly what came out.

The overall width of the bearing/race is about the same (2 7/8"), as is the height of the setup about the same. But the inner diameter of the bearings on the LM102949 is about 1 3/4" vs 1 5/8" on the LM501349.

It's worth noting that I've got ARB lockers, and running a 10-tooth pinion gear and 47-tooth ring gear (what I've deduced is a Series gearing setup).

Input welcomed...but it all is back together on the bench and seems ok.
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Old November 1st, 2012, 08:28 PM
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I think the LM10 series is for the 24 spline diffs and the LM50 series is for the 10 spline diff. The outer diameter of the cup is the same for both of them at 2.891 in which would be consistent in all carriers. The bore is different at 1.625 for 10 spline and 1.781 for 24 spline.
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  #15  
Old November 2nd, 2012, 04:13 PM
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10x47 is series.....8x38 is aftermarket...
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Old November 2nd, 2012, 04:28 PM
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Back when I first started wheeling, and couldn't afford aftermarket R&P's (and series diffs were a dime a dozen), I would run ARB's in Series diffs. The carrier races were a larger diameter but ARB supplied race shims (looked like speedi-sleeves) to run an ARB in a series diff. Also had to use a spacer ring on the carrier behind the ring gear. I would take several spare diffs with me (bucket 'o diff) with the air line predrilled and tapped. When (not if) I chummed one up, I'd swap the ARB carrier in camp, set the backlash, and keep on wheelin'......
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  #17  
Old May 31st, 2015, 05:05 PM
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Alright Lav, this really isn't helping! First, don't bearings and races come in pairs, so why the two part #'s? Second, did you ever figure out the matching issue? I am rebuilding the diffs for my EV so have decided to go full monty and do the bearings too, so need to order some parts.
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