A few questions...

Alright I think someone finally has a good picture here! Who else is thinking this?

But...Am I going to need to drive in 4-Hi all rainy days?

Or should I just learn how to drive it? Is the there a learning curve, or is it that sensitive?
Jeremy, think of my durango, Heavier and less powerful then your 5.9. and i still spin the rear with these brand new tires. if i had a Full-time option, i would have it locked in all winter.

throw it in 2wd for Highway cruising/summer driving for better Fuel economy, but the added traction is the key.. do you not remember that onramp situation a few years back?hasta
 
Stop stomping on the gas and you won't peel out so bad. It's personal opinion really, think about what is best for you/more practical.
 
Are you saying 242 or 249? In all these situations, AWD is the better of the three. I've been reading constantly and all the Grand guys(even 5.9 ones) have installed 231's into theirs. Just going with the crowd on this because I have no experience of what it will be like. Just wanting to make the right choice for myself and my family.
 
Well I have a 89 with a np231 but my t-case has been shot and it is fine in 2 wheel drive. Just sucks driving to the ski hill but I have made it every time. AWD is an unneeded luxury in a jeep if you ask me. It would be nice in rain but it's, IMO, definitely unneeded.
 
Stop stomping on the gas and you won't peel out so bad. It's personal opinion really, think about what is best for you/more practical.
This is what I think everytime I pull into traffic on a rainy day or want to excelerate without spinning the tires......................


Or I can have fulltime 4wd and actually get traction!!!! hasta

The 231 is a better option for offroad use due to the aftermarket parts available for it, the smaller size, and that is it. The 242 is just as good but good luck finding a heavy duty output shaft and 4:1 gearing.
 
If this ZJ will see wheeling use, go with a 231.
If this ZJ will be a DD street rig, go with a 242.

Honestly though, Ive never wished I had 4wd on wet pavement. Granted I have a 4.0 XJ, not a 5.9 ZJ, but if you can handle not putting the pedal to the floor, you shouldnt have a problem with spinning the tires. Ive driven my dads 2wd, V8 pick-up in the rain...not to mention up Hwy2 in the snow, without having problems spinning the tires. Your ZJ has much more weight over the rear tires than the bed of a truck.

-Lyle
 
I drove a 00' transam here in the NW for three years and never had the problems in the rain you guys keep mentioning and yes carefully in the snow. I think that was (marginally) lighter and much more powerful. I would admitt AWD would be nice but by no means absolutly necessary.
 
the difference between a transam and a 4" lifted ZJ is huge. that car probably didnt have nearly half the body roll a lifted zj has.
 
Lifted vehicles have more traction because they are further away from the Earth. They have more potential energy built up. During driving, you get a little rear end squat ... in essence you are combining the acceleration due to gravity and that potential energy into more downward force.

Think monster truck.









:eyes:
 
Lifted vehicles have more traction because they are further away from the Earth. They have more potential energy built up. During driving, you get a little rear end squat ... in essence you are combining the acceleration due to gravity and that potential energy into more downward force.

So in other words you get more traction with a lifted Jeep with RWD then you do in a Trans Am. That seems like what your saying. Correct me if im wrong. So you will be plenty good with an np231 and RWD in any condition.
 
So in other words you get more traction with a lifted Jeep with RWD then you do in a Trans Am. That seems like what your saying. Correct me if im wrong. So you will be plenty good with an np231 and RWD in any condition.

The problem is, though, with that combination of gravitational acceleration and Ke, you are pulling down on the rear more than the front. This means the front tends to have less traction in the front. Unfortunately, the mechanics of the the fulcrum and lever that the plane of the Jeep and it's drivetrain(tires) make, you end up with a net loss of traction.

Sorry.
 
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