Question about 1993 Jeep Grand Cherokee

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93' Jeep Grand Cherokee Laredo brakes while steering

Recently I switched the t-case at my GC and a bearing at the end of the transmission which caused noise while driving. The noise is gone now. A new problem appeared, when I was driving longer trips with this car. It brakes when I want to steer more then one turn of the steering wheel. It only caused this issue when I was driving more than 30 miles or so. It seems like that not all four wheels are having the appropriate speed to do this maneuvers. The t-case was checked already and is fine. What else can cause this problem?

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  • Claudius Zschaler Feb 23, 2009

    Well the tires are actually same size, but not same brand. I don't know if the first owner changed either one of the differentials. I know he replaced the transmission,but I don't think that can cause the problem. What happens if the lube is bad in the front differential. Is that possible at all, or can it be just to less? I mean the fact that I have this problem only when drove about 15 or more miles, excludes any period mechanic problems? Well I have no clue about cars...

  • Claudius Zschaler Feb 23, 2009

    Alright, we have been at the transmission shop today. they switched the lube for both diffs. Both are looking very good. I will see, to get a new pair of tires, which are the same brand like the better pair that I already have.

  • Claudius Zschaler Feb 27, 2009

    The trani shop only suggested to change all four tires. I will check the necessarity via your method with the crayon. Thank you for this one! I do not know if my power steering pump is bad. It seems more, that my rear wheels are having the same speed, when I want to turn the car. I met a guy today, with a new theory. He said, that there were clutches between the diff that should loosen the wheels while turning. His theory was, that those clutches might be stucked. I told him that the lube from the rear diff was black (i saw it!). Is there any truth in it?

  • Claudius Zschaler Feb 28, 2009

    Hi! Today, I changed all four tires. They are now instead of two different branded 235/75/R15, four Kumoh 225/65/R15 (that is the size a GC was delivered from factory). I have the feeling, that it is a little bit better, at least this abrupt jumps of the wheels disappeared, while turning. But it still does not seem normal. It still gives this braking sensation, pretty strong, also since I've been told that this might be normal, for a permanent 4WD. I am pretty sure nobody did modify this car in any way, but I would like to go the way with the additive. What is the name of that stuff? And where can I get that?

  • Claudius Zschaler Apr 24, 2009

    So I have exact the same brand and size of tires now. The problem is still there. At least it does not make this sudden jumps anymore, when driving a couple of miles and then turning in any directions. Something, somewhere must heat up and then not work properly. If I start the Jeep with a cold engine and steer then in any direction it is fine, no problems. What the heck... I thought maybe about a permanent e-brake. Is it possible, that the e-brake is permanently braking and then binds up the rear wheels? Does it make more sense to check the transfer case (which I have switched). I also heard aubout the possibility, that the servopump can be bad. Help me please guys.

  • Richard Scordino May 11, 2010

    Do you have the exact same size and brand tires on all four wheels? Has anyone changed either front or rear differential? Transfer case can internally bind if wheel speed differs from front to rear. It also could be something unrelated from what you did, so close attention to everything while checking is essential!



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If the diff is really low it may be overheating and binding but it would have to be really low or have a mechanical problem to begin with.
Tires can cause binding because different manufacturers tires with the same #s have a different diameter (I know they should all be the same but they are not). This should cause problems if you have all wheel drive or are using 4 wheel drive (both ends of vehicle will be trying to go different speeds...Same holds true for different ratio diffs)If you have little experience with this stuff have someone go over it for you, It will cost less than blowing up the transfer case or something!!!

Posted on Feb 23, 2009

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  • Richard Scordino Feb 23, 2009

    Did the trans shop check the problem? did they have any ideas?
    About tires...Put a crayon mark on each of your tires and match the marks to corresponding marks on the ground.roll the car till the tire mark is again straight down. the distance each tire rolled should be pretty much the same, or less than 3/4inch. If you can't adjust this by changing air pressure (5lbs or less) it can cause binding. This should not show up unless you have full time 4wd. Just a thought...are you shure that your power steering pump is not going bad and loading down the engine on turns? Something here just does not make any sense....Again...what did the trans shop think?

  • Richard Scordino Feb 27, 2009

    The guy you were talking to was somewhat correct but only if you had a positraction rear in both front & rear. Some "rock crawlers" use this setup, however factory vehicles are equipped with either two "open" type diffs or a posi at rear. open at front.. That does give me an idea though...If your rear diff is a posi, it could be dragging the outside wheel around turns and giving you the sensation of braking. The easiest way to identify a posi unit is to jack up both wheels at rear and in neutral, turn one wheel by hand. If posi, the wheel on the oppsite side will turn in the same direction. a non posi will turn in the opposite direction. Or, have someone hold the opposite wheel. you should not be able to turn yours. Just for laughs, try it in the front also to see if someone modified your ride. If it is a posi, since you already changed lube, you can get a special additive to free up positraction plates. After you put it in you will need to make several tight turns in both directions to free them up.It dosent cost anything to check this out and I will laugh if thats the problem!

  • Richard Scordino Feb 28, 2009

    Its pretty much called positraction additive. The older posi lube was whale oil (opening a differential cover smelled up the shop for hours) But that now being illegal, posis just have regular lube plus that additive to make up for what the whale oil used to do. It's ok to put in a regular gearset, so even if you don't have a posi it won't do any damage. (if you just had diffs serviced you may need to siphon some lube out so the additive fits in there without spilling.



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