Manual Diff Locks and ARB Locker - Defender Source
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Old May 25th, 2008, 07:22 PM
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Keith Kuboske
94 D90 ST Arles Blue
Join Date: Oct 2007
Location: Nashville,TN USA
Posts: 69
Manual Diff Locks and ARB Locker

Being new in this area of lockers and not wanting to tear anything up, I was wondering if the low or high diff lock would work or even could engage when the arb diff lock is not or if it is. Set up is arb diff lock on rear only on a 94 defender 5 speed 3.9l. When or where should the arb be engaged? When off road, we usually put the diff lock in low gear in our other Defender that does not have arb lockers and have had little trouble of being stuck anywhere.
Thanks any info,
K Kuboske
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Old May 25th, 2008, 09:45 PM
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Paul Davis
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Paul Davis
97 ST
Join Date: Jul 2006
Location: Pembroke Pines, FL
Posts: 281
The ARB and the diff lock have nothing in common as far as usage. In fact most would say that is why they have an ARB so they can turn it on and off at will. As for when to use it- I would say when you can't get up something and need a little umphh.
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Old May 27th, 2008, 10:20 AM
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Loic Fabro
95 D90 - 96 Disco -06 LR3
Join Date: Oct 2003
Location: Herndon, VA - USA
Posts: 1,642
You guys have to start using the proper terminology or it will be hard to explain things.....

The Transfer Case is the box that has high and low gearing. It also includes a differential and a matching differential mechanism. Typically refered to as "CDL" (Central Differential Lock[er?]).

As Paul said, no relationship between the CDL and the axle differential lockers. I'd recommend you read up on the theory on when to use each (or together) if you want to avoid braking things.
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Old May 28th, 2008, 10:07 AM
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Dan Prasada-Rao
1963, 109 Station Wagon
Join Date: Oct 2004
Location: Great Mills, MD, USA
Posts: 930
Think of it this way: You have three differentials in your truck. One in the transfer case, one in the front axle and one in the rear axle. Locking the diff in your transfer case essentially puts you on par with most of the old school part time four wheel drive rigs like a series truck, in that your front and rear drive shaft are now forced to turn at the same speed. Locking the arb in your rear axle would do the same thing for the rear tires in forcing both of them to turn at the same speed.

Personally, I would lock the center diff in the transfer case first. Then, if I encountered traction issues with one of the rear tires slipping, I would lock the arb to get through the obstacle.

Like MonLand suggested you may want to read up on theory of operation, also watch other folks on your next wheeling trip and see you they use it, as well as what works for them and what doesn't.
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Old May 28th, 2008, 10:24 AM
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NAS 97SW & 83 One Ten Tdi
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I learned a lot by reading the write-ups Bill at Great Basin Rover's provides on his website. Google it and you shouldn't have a problem finding it.
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