what are lockers? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-04-2001, 12:31 AM
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what are lockers?

Hey guys, sorry for the crappy question, but I've been seeing people talk about this all other the place. I tried searching the forums looking for a good answer, but I couldn't find one. I was just wondering if someone could explain to me what lockers are and what all this 30 and 33 and 35 and 44 talk is about? You know, stuff like 44 lockers in the rear and 33 lockers in the front, or whatever. Thanks.

'93 Wrangler Renegade / 4.0L
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post #2 of (permalink) Old 09-04-2001, 01:14 AM
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Re: what are lockers?


Here's my explanation:

First, the 30, 35, 44, and 60 you see a lot refer to the model number of axle that a company called Dana made. Your '93 wrangler has a Dana 30 front axle and a Dana 35c rear. The 44, 60, and even 70 are larger models usually used in 1/2, 3/4, and 1 ton trucks.

As for lockers, it helps if you understand how a standard differential works. Here is how normal differentials work: The gears (spider gears) in the differential allow the wheels on the same axle to spin at different speeds. So, as you corner, the outside wheel can go faster than the inside with relatively the same amout of torque. Now, if you have ever seen a car stuck in the snow you can see the disadvantage to the standard differential. One tire can be on dry cement while the other is on slick ice. All (or almost all) the torque goes to the path of least resistence (the tire on the ice) and the wheel spins and the car goes nowhere.

A locker is a device that replaces the spider gears (at a minimum) and locks the two wheels so that no wheel spins slower than the drive shaft. Lockers do allow one wheel to spin faster in a no/low torque situation. So in a parking lot with the clutch in (no torque) the outside wheel can spin faster around the corner.

The reason they are good four wheeling is the wheel with the most traction gets most of the torque. If you have a tire completely off the ground the other tire gets all the torque and neither wheel will spin slower than the drive shaft. This means you won't be stuck because of a lifted wheel. In the snow example a locker would mean the wheel on the cement would get effectively all of the torque and the car wouldn't be stuck.

4.6 Stroker Scrambler
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post #3 of (permalink) Old 09-04-2001, 06:31 AM
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Re: what are lockers?

wow that's a newbie question if i ever heard one! just yanking your chain. heck i though a locker was a lock out hub the first time i hear of one. for off-roading a locker is the way to go. if the primary function of your jeep is a daily driver a locker is probably not what you want unless it is a selectible locker like the ox or arb. these lockers lock on command with either air (arb) or a cable (ox). unless you realy wheel you don't want one.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
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