tires effect transmission case?

[littleblackxj]

I honestly don't think tire wear has any negative impacts. Think about it, what happens when you go around corners? You get different tire rotation rates. Now compare this to uneven tread wear. How much of a difference can tires really be? 1/8", 1/4" at most?

[nichole43]

Originally Posted by BACKWOOD

If you have full time 4wheel drive, how possible is it that you would have extreme enough differences in your tire size by treadwear. Unless if you drove forever with bad alighnment or inadiquite tire pressures. Nichole how bad is your treadwear, are they that noticeably different?

well all the tread wear is different, it was that way when i got it and i've only had it a couple months. passenger front is almost bald and driver front is right behind it..the back are better and probably would make it through my michigan winter which is another reason i'm asking. money is tight for pretty much everyone right now so i want to know if i can get away with just changing the front two but if it will cause problems i'd rather just throw down the money and do all four

[4.3L XJ]

Originally Posted by nichole43

well all the tread wear is different, it was that way when i got it and i've only had it a couple months. passenger front is almost bald and driver front is right behind it..the back are better and probably would make it through my michigan winter which is another reason i'm asking. money is tight for pretty much everyone right now so i want to know if i can get away with just changing the front two but if it will cause problems i'd rather just throw down the money and do all four

You should be able to, no problem. However the tire shop boys are going to see female and insist on all four. That would be better of course, but it is your money right. It will perform fine. Now here is the catch. They will put the good tires on the back because that is what they are taught for AWD cars. This is a 4WD. You want the new ones on the front. With the "taller" tire on the front, then the front will pull the back a little. This is a good thing. You don't want the back to push the front, you will be in the ditch on every curve. They will also try to put 38 psi in your tires too. You want about 28# in the front and 25# in the back. This will give you four times the traction and not hurt your tires in the winter and your safety margin will be that much again higher. That is what I have done for the past 10 years and thousands of miles on snow and ice.

[mcatald]

NP249, NV249 Viscous Coupling.

nichole43 take a look at this and then make your decision.

[nichole43]

Originally Posted by 4.3L XJ

You should be able to, no problem. However the tire shop boys are going to see female and insist on all four. That would be better of course, but it is your money right. It will perform fine. Now here is the catch. They will put the good tires on the back because that is what they are taught for AWD cars. This is a 4WD. You want the new ones on the front. With the "taller" tire on the front, then the front will pull the back a little. This is a good thing. You don't want the back to push the front, you will be in the ditch on every curve. They will also try to put 38 psi in your tires too. You want about 28# in the front and 25# in the back. This will give you four times the traction and not hurt your tires in the winter and your safety margin will be that much again higher. That is what I have done for the past 10 years and thousands of miles on snow and ice.

thanks 4.3L XJ for the advice about the psi i never would have thought of that and i i knew that youre supposed to but the better tires in the front but i didn't know the tire guys would but them on the back so i'll check for that but i feel that the psi difference counteracts the link that mcatald sent me about the VC. wouldn't different psi have almost the same effect as different tread wear? and trust me i know how car guys can sometimes be when they see a chick come in without a guy haha

[4.3L XJ]

Yes, but with a VC it allows some slippage, that is what it is for. If you get into really slippery situations, you should lock it anyway.

[ZackXJ]

Yea I think everyone sumed up everything lol.

[nichole43]

Originally Posted by nichole43

thanks 4.3L XJ for the advice about the psi i never would have thought of that and i i knew that youre supposed to but the better tires in the front but i didn't know the tire guys would but them on the back so i'll check for that but i feel that the psi difference counteracts the link that mcatald sent me about the VC. wouldn't different psi have almost the same effect as different tread wear? and trust me i know how car guys can sometimes be when they see a chick come in without a guy haha

i do have one last question 4.3LXJ, how does changing the psi give me more traction? i mean i have the basic idea in my mind that it would be because with a lower psi the weight of my jeep would be able to impact the tires more, for lack of better words at the moment, is that right or is there another reason?

[WJCraig]

The tires will be more "Squishy" (for lack of a better word) so it'll grab a little better and will have a little more contact with the road (or trail or wherever you happen to be driving). It will also increase rolling resistance, so fuel economy will decrease.

Push down on a hard basketball while rolling it along the ground, then let some air out and push down while rolling it again to get a good visual of the difference in a tire with a lower psi...

[4.3L XJ]

Well said. softer tires conform to the road better. We do this even more when we off road. It makes the "foot print" o the tire a little bigger and allows it about twice the area to grab on slick surfaces. At these pressures say in a 205/70/15, there will just be a slight squish in the side walls. Not much difference in rolling resistance really. It the summer or drier months, pump them back up.

[nichole43]

okay that's the basic thought i had, thank you

[4.3L XJ]

No problem. Good luck.

[lmabadie]

If you have full time 4wheel drive, how possible is it that you would have extreme enough differences in your tire size by treadwear.

I had the (bad?) habit or replacing tires in pairs. That started when I had a puncture in a tire that could not be replaced and all tires where about 50% worn. Now, after having replaced 2 front differentials and several other repairs in my Jeep Grand Cherokee 98 Limited (Quadra-trac) I wonder 1) Why this is not written in red ink in the MANUAL? 2) Why do Firestone and Wal-Mart, etc. never warned me that I should change ALL tires 3) Why didn't the SALES person that sold me the car told me all this so I coul dhave purchased a different car? Sorry, I am pissed off. I just learned about this which may be obvious to most of you.

[drakan1908]

My owners manual says that ALL tires need to be within 1/4 inch of each other. When I had new tires put on mine they set the front at 25to 28 and rear at 35 to 38 and when I was in Fulltime 4wd ( i have a 242 tc) my front would start hopping/binding. Equalized the air pressure and my problem stopped.

[nichole43]

Originally Posted by lmabadie

I had the (bad?) habit or replacing tires in pairs. That started when I had a puncture in a tire that could not be replaced and all tires where about 50% worn. Now, after having replaced 2 front differentials and several other repairs in my Jeep Grand Cherokee 98 Limited (Quadra-trac) I wonder 1) Why this is not written in red ink in the MANUAL? 2) Why do Firestone and Wal-Mart, etc. never warned me that I should change ALL tires 3) Why didn't the SALES person that sold me the car told me all this so I coul dhave purchased a different car? Sorry, I am pissed off. I just learned about this which may be obvious to most of you.

well i don't know how long ago that was but i went to discount tire christmas eve day and they, now, explain everything to you and you actually have to sign a liability sheet saying they told you about what problems can be caused, it may just be their own personal policy though