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Topic Review (Newest First)
02-25-2014 02:53 PM
Slater451 Because even with an open diff your front tires are still connected to each other via the spider gears. So even thou they are not fully locked together the still turn together and with out snow, mud, ice etc... The tires cannot break traction like they are suposed in order for you to turn smoothly
02-25-2014 02:01 PM
Wondertwin1 Then why does my currently fwd open diff TJ hop when I turn to sharp ?
02-25-2014 01:56 PM
Digger84 No if they both (left and right)have great traction and aren't forced to turn at the same rate because of an open diff nothing has to give but if you lock the front and rear together via transfer case then even though the left right have differential capability you have no differential front to rear and that is why it forces a wheel to break loose and why they add a front to rear differential mechanism on awd cars in addition to the front and the rear left to right differentials
02-25-2014 01:33 PM
Originally Posted by Digger84 View Post
So since in your world an open front differential does NOT allow the front wheels to be driven at different speeds to cover different distances of travel around a comer perhaps you could explain why the bother to install them when a spool would be simpler and cheaper?
Okay. Notice this is all about great traction on asphalt and such. I've said it in almost every post. An open differential sends power to whichever wheel spins easiest correct? Well if they both have great traction, one of them has to give. Which brings the skidding and hopping and all that. I said if you're in four wheel drive, and your tires don't skip in a place with great traction, that means something else gave instead of the tires. And it usually costs money. What's so hard about that? There's no separate system, no separate clutch. There's simply 2 driveshafts going opposites directions with the exact same power source.
02-25-2014 01:10 PM
Digger84 So since in your world an open front differential does NOT allow the front wheels to be driven at different speeds to cover different distances of travel around a comer perhaps you could explain why the bother to install them when a spool would be simpler and cheaper?
02-25-2014 12:28 PM
Wondertwin1 I know all about that. My TJ has been front wheel drive the last 2 months. And it still hops if I turn to short. Your test doesn't prove much, except that it's an open diff. When driving. Both wheels will be forced to turn the same direction, and there's powered coming from the driveshaft. So. They will hop/skid/slide whatever in places where there is great traction. And like I said. If it doesn't, you've got issues.
02-25-2014 07:57 AM
Originally Posted by yz kid 69 View Post
P.S how will I know if I did mess anything up?
Jeeps are pretty vocal about that sort of thing. Listen for the loud bang, followed by grinding.
02-25-2014 07:25 AM
Digger84 No wrong again

There is a front differential that is not locked so the front tires do not have to turn at the same rate left and right that is why you have a differential. If you doubt take a TJ with open front Diffy place in park or any gear (manual) and in 4wd so front drive shaft is locked to non rotating engine . Now jack up both front tires so they are off the ground and hand turn a front wheel and watch the other front wheel turn the other direction( that is not the same rate of travel left to right despite being in 4 wheel drive)

4h applies no additional power to wheels it just takes some of the power applied to the rear and shifts it to the front

What a part time system like on the TJ does in 4H is force total front wheel rotations to match total rear rotations no more and no less
02-25-2014 02:26 AM
Wondertwin1 Either or. Like I said. If you are on a high traction surface, in. 4wd, and your tires don't skip during a turn, then you've got an issue. Something's got to give. It's usually tires, if it's not, then something is broken.
02-25-2014 01:30 AM
kylestjsandy It should be fine, but don't do it often. People on here keep saying its from you front and rear tires trying to spin the same number of revolutions, but they're only slightly wrong. The bounce or skip or whatever you feel like calling it is from both FRONT tires trying to spin the same revolutions together. On a standard car the tire to the inside of the turn spins less revolutions then the outside tire and slower. The outside tire has to spin faster to keep up with your car. The skip is from the tires trying to spin together. No biggie as long as you don't keep doing it.
02-24-2014 06:27 PM
Digger84 Well not too much power it was because the 4wd system forced the two front wheels to turn the same number of revolutions as the two rear tires even though the were traveling different distances. So tires must slip on road some and on asphalt the slipping does not come as easy

Unlikely any harm but does place additional unnecessary stress on system

To see what I mean drive a bike thru a puddle then around a corner and front and rear trace different paths traveling different distances

All part time 4wd slip some around a corner but more dramatic on less slippery surface

The AWD full time systems adds a differential between front and rear so that the tires don't have to slip when you turn a corner
02-24-2014 06:26 PM
GabeTJ You're fine. Like someone said earlier. You would be VERY aware that something was wrong.
02-24-2014 06:09 PM
Wondertwin1 When I buy used 4wd vehicles. That's exactly how I test to make sure the 4wd is working fine. And for people that never use 4wd and have locking hubs, it's good to put it in 4wd every now and then and let the fluid and parts move a bit. You didn't do a bit of harm. The "bucking" you got was from your tires slipping because they basically had to much power. Which is good, if you had it 4wd and it wasn't bucking on dry asphalt, then you had some serious damage somewhere between the transfer case and tires.
02-24-2014 06:01 PM
DoubleOught At the worst, you might have caused a little premature wear on your front tires. Never done it in my jeep but a 4wd pickup once.
02-24-2014 03:56 PM
Ryan Angela Although it's not good practice to drive on dry pavement in 4wd, the parts involved are not as fragile as some make them out to be. Like stated already, you'd know if you broke something. There's a bunch of threads on the 4wd indicator light. Simple check, simple fix. There's a small switch threaded into the top of the transfer case that tells the dash light to come on when you shift into 4wd, this switch fails. $15 repair.
02-24-2014 02:41 PM
ThatWhiteMachine101 It jerks in 4wd on pavement because your front tires are getting too much traction. The front tires turn at the same rate in 4wd under power. This is hard on your front axle. If you had broken something, you would know. Trust me.
02-24-2014 02:36 PM
yz kid 69 To be honest I didn't know there was a 4wd indicator light. Mine must be out. I have only used 4wd this winter, so maybe 3 times max. I will have to get that checked out as well, but just wanted others opinions to weather or not I messed anything up with that few seconds of "bucking"

thanks for your fast reply. I Learned my lesson

P.S how will I know if I did mess anything up? like I said it drove normal after this happened. I did not put it back in 4wd.
02-24-2014 02:33 PM
hosejockey61 "Experience is what you get right after you needed it"

The jerking feeling is due to being in 4 wheel drive and making a sharp turn. It's normal and more than likely you didn't hurt anything. However, it's not good to drive in 4 wheel drive when on dry pavement or concrete.
02-24-2014 02:32 PM
Shark_13 Yeah most likely you didn't hurt anything.
02-24-2014 02:30 PM
Big Sarge 99% that no damage was done. Many have done this and everything will be fine. I would not even worry about it. Does your 4WD indicator light not work?
02-24-2014 02:21 PM
yz kid 69
I did the only thing your not suppose to do

First let me introduce myself, this is my first post but I have been reading threads on this site for about a year, never had to post anything everything was always answered.

On to the stupid thing I did. last night I was dropping off something at my grandmas house and she does not drive so her driveway was plowed in with this jersey snow. So I put it in 4 high and went on through. I left my jeep(2006 wrangler, 83k miles) in 4 high for the ride home to my house (5 miles) then to work the next day(today) (15 Miles) on my lunch brake I ran to 7-11 and when I turned into the parking spot the car was giving the signature "jerking". I have read about this before and knew exactly what it was. after parked I took it out of 4 high (after slapping my myself for the stupidity) I turned sharp in 2 wheel and it felt fine but did I do any damage when I was getting the jerking motion? Thanks in advance.

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