I know pickups have them still. Wasn't sure if pumpkins are designed different on manual hub vehicles. Thanks.

 

Unlocking you mean. I guess theres less resistance on the vehicle if the tires can just spin without have to turn anything

 

Yea. Unlocked locking hubs lol.

Any data around? I mean 1-2 mpgs maybe? I dunno.

I guess it shouldn't be your only reason to get selectable hubs.

 

.5 to 1 brazillion.


Far to many variables to quantify a specific number.

 

Maybe ill report em. Bought to have to remove front ds to rebuild DC joint and the u joints too.

OP, hope your question was answered and understood

 

How's that work with the np242? Since it has the full time option I thought that during a turn it would sense that and unlock the inside hub allowing you to turn?

 

No, hubs have nothing to do with t-cases.

 

Schirm is correct, the hubs do not involve the transfer case directly. The Np242 full-time feature acts as an open differential between your front and rear axle. When you put it into 4hi or 4lo, it locks the power between both axles, just as a locker would in your D30.

 

Not fully exactly. The np242 has a viscous coupler which allows a difference in speed between the front and rear wheels. This allows you to drive in full time on dry pavement and not bind up cause the wheels are all trying to go the same speed. Secondly, when the np231 and 242 goes into hi or lo yes it sends power to all the wheels but not like a locker. If you have open differentials, like most stock jeeps have, and a rear and front wheel come off the ground, since Those have the least "resistance" they will spin freely and the tires on th ground will just sit there. Now if you have a locker then if a tire comes off the ground, the locker "stops" the resistance and transfers it to the other tire so they both spin at the same time on that axle only. So if the rear is locked and the front isn't and the front comes off the ground, hope your tires in the rear have enough traction to push you forward. Now my fingers hope so hope this cleared up everything. Oh and locking hubs just lock the "rim", in reality the hub, what it's attached too, and the axle that goes into the pumpkin. Unlocked hubs just spin the hubs and tires. D30 and all late year Cherokees hAve one piece hubs

 

Right, that's why I said "axle" in general terms to avoid this big explanation...but thanks for clearing that up :-)

 

What do you mean, "not fully exactly"? The np 231 is a locked t-case. Meaning it does not allow differentiation of front and rear axle carrier rpms when in 4wd. That has nothing to do with differentiation of parallel wheels on an axle.

 

I was talking in reference to the axles not the transfer case. I'm sure in my jumble I said about the difference between the 242 and 231.

I said when in hi or lo it sends power to the wheels but not like a "locker" and then go on to explain about lockers. I never sai the 231 wasn't a locked TC

It was because o empties last sentence I described lockers and such. He referred to a TC and a locker in the same paragraph in relevance to the D30. Just doesn't paint a clear picture to someone who doesn't know what a locking hub, lockers and etc, is. That's all

 

Oh, ok, I understand now. We arnt arguing, just figuring the best way to phrase things.

 

Lol sorry I know I def sounded rude. I agree with you too. It's just when he compared the TC to an open diff. It's cool

 

That was the way someone else described the full-time feature in another thread that made sense to me.