New ARB locker design change

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Shipwreck

Shipwreck

Joined
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I just wanted to give everyone who is planning to install an ARB locker in their pre-'90 land cruiser a heads up on some changes that you need to know about when you order your install kits. ARB has made a design change recently that makes the locker incompatible with the stock carrier bearings.
ARB has discontinued the old RD02 (front - full floater) and RD08 (rear - semi float) lockers. They have been replaced by the RD33 and RD124 respectively. The RD33 is listed on ARBs applications chart, but the RD124 is brand new and is not yet listed. The primary change in design involves the carrier bearings. ARB has changed from a stock 45mm to a 50mm i.d. carrier bearing. This is the same carrier bearing used in the 80-series cruisers.

-
So, this means that when you order the new locker you must also order new 50 mm carrier bearings, or if you order an entire ring and pinion install kit like I did, you must order the rear axle 80-series kit.

I'd like to send props out to Kurt at Cruiseroutfitters. Neither he nor I new about the change to the RD08 when I ordered my locker and install kit. I ordered the stock FJ40 install kit and last night discovered the problem with bearings. I called Kurt this morning and without hesitation he offered to exchange the correct bearings. His customer service rocks! Thanks Kurt.
 
Shipwreck said:
...I'd like to send props out to Kurt at Cruiseroutfitters.....
Click to expand...

Thanks, your bearings should be there, and my site now reflects the change :D
 
I just bought my arb front and rear lockers from Marlin Crawlers for my 78 fj40, I was wondering if the part # for both the rear and front are the rd124?
 
cc93cruiser said:
I just bought my arb front and rear lockers for my 78 fj40, I was wondering if the part # for both the rear and front are the rd124?
Click to expand...



They are not the same part number, semi-float and full float. However, The semi-float locker can be used in a full-float application, but not vise versa, and some dealers, including myself, have sold the semi-float units at customer request to them for installation in the front, so that there would not be a compatibility issue between the front and rear, in the event that something catastrophic occurred, and they needed to swap the front diff into the rear axle.

The semi-float locker is a RD124

The full-float locker is a RD33
 
Poser said:
They are not the same part number, semi-float and full float. However, The semi-float locker can be used in a full-float application, but not vise versa, and some dealers, including myself, have sold the semi-float units at customer request to them for installation in the front, so that there would not be a compatibility issue between the front and rear, in the event that something catastrophic occurred, and they needed to swap the front diff into the rear axle.

The semi-float locker is a RD124

The full-float locker is a RD33
Click to expand...

So in a nut shell, I got the right parts? :confused:
 
cc93cruiser said:
So in a nut shell, I got the right parts? :confused:
Click to expand...



What part number ARB lockers did you order/get? :confused:
 
Also, by doing this, did I just make my front full float differential into a semi float differential?
 
Last edited:
Poser said:
What part number ARB lockers did you order/get? :confused:
Click to expand...
I got the RD124 for the front and rear diffs
 
cc93cruiser said:
I got the RD124 for the front and rear diffs
Click to expand...



That is fine. The only difference is the semi-float has a little opening to get the c-clips installed on the rear axles. You will just install the spacer pieces into the front, just as you do the rear, but do not need to worry about the c-clips.



:beer:
 
make sure to install the cross shaft retaing pin in the front or your F*****becasue the ARB install will not tell you to do so untill its too late
 
When I ordered the 80 series carrier bearings today, Toyota showed a different part number for a diff with the electric locker.

Does anyone know what the application is for the 50mm I.D. bearings: a locked or unlocked 80?

FYI, the bearings are:

Koyo: STB5080
Timkin: (have # at home -- will update later)

Thanks.
 
This is from the ARB Web site application guide. http://www.arbusa.com/alac/215110.pdf

Note how it would appear there is something different in the 77 - 92 that they don't require the larger 30mm carrier bearings. Or is there a mistake in the document? I may shoot them a email as I have a RD124 on the way and need to know if I need the new bearings or not. :confused:
arb.webp
 
Timken number:


32010X
 
You do need the 50mm ID bearing for the RD124.


John Smith said:
This is from the ARB Web site application guide. http://www.arbusa.com/alac/215110.pdf

Note how it would appear there is something different in the 77 - 92 that they don't require the larger 30mm carrier bearings. Or is there a mistake in the document? I may shoot them a email as I have a RD124 on the way and need to know if I need the new bearings or not. :confused:
Click to expand...
 
John Smith said:
This is from the ARB Web site application guide. http://www.arbusa.com/alac/215110.pdf

Note how it would appear there is something different in the 77 - 92 that they don't require the larger 30mm carrier bearings. Or is there a mistake in the document? I may shoot them a email as I have a RD124 on the way and need to know if I need the new bearings or not. :confused:
Click to expand...





How do you draw that conclusion?


I guess that I am missing something.....



ARB RD124 PDF <---- this is a link
 
80 Rear Bearing Info :cool:

Carrier Bearings for OE Carrier & RD124 or RD33 Lockers (50mm ID)
Timken: 32010X - Bearing: TIMK X32010X Race: TIMK Y32010X
OEM Toyota: 90368-50024 (which is either a Koyo or a Nachi - NACHI 50KB801
NACHI 50KB831LT)



I compile spreadsheets on this stuff... yes, I am a geek :D
 
John Smith said:
...Note how it would appear there is something different in the 77 - 92 that they don't require the larger 30mm carrier bearings. Or is there a mistake in the document? I may shoot them a email as I have a RD124 on the way and need to know if I need the new bearings or not. :confused:
Click to expand...



Spare yourself the email.... you DO need the 50mm carrier bearings for the RD124 UNLESS you have an unlocked 80 rear 3rd and you plan to reuse the existing 50mm carrier bearings ;)

PS, who sold you the locker... you should ask them :D
 
Thanks for the info!

Fortunately I ordered the right ones -- for the non-locked 80 series diff, as you said Toyota OEM #90368-50024.

Kurt, had I not been in a hurry... - I see you sell the install kit IKTOYLCB kit with both carrier bearings and pinion bearings for $120. Next time I'll know where to go! (and do it ahead of time!)

Compared to Toyota OEM (p/n) and list prices:
50mm carrier bearings (P/N 90368-50024) -- 2 x $55.96 each
Upper / smaller pinion bearing (P/N 90366-30038) -- $44.61
lower / larger pinion bearing (P/N 90366-40059) -- $66.59

BTW:
Side by side comparing the Koyo with the Timkin 50mm carrier bearings, the Koyo rollers and race look to be wider with more contact area. The Koyo also has 26 rollers and the Timkin has 23. Yeah, I know - it's kind of geeky to look that close! :)
 
terrx said:
...BTW:
Side by side comparing the Koyo with the Timkin 50mm carrier bearings, the Koyo rollers and race look to be wider with more contact area. The Koyo also has 26 rollers and the Timkin has 23. Yeah, I know - it's kind of geeky to look that close! :)
Click to expand...

Yup, I've been comparing all sorts of Timken versus Japanese bearing applications, pinions, carriers, wheel bearings, etc. The taper is very differnet on most of the applications. While nearly all applications are good either way, there are certain apps where this isn't the case. :D
 
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