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Old 08-07-2010, 06:19 PM   #1
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quick question.

99 grand cherokee with quadra trac.Do you use friction modifer in rear end?Says on bottle not to be used in jeep quadra trac and trac lock rears.Any cherokee owners out there-need answer like yesterday for young couple heading to montanna tomorrow.Thanks Baja.

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Old 08-07-2010, 06:43 PM   #2
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A friction modifier is required for a Tracloc rear differential because a Tracloc LSD is clutch-based. I'm not sure if your JGC has a Tracloc rear LSD (limited slip differential) but my guess is that it does not.

However, a friction modifier additive wouldn't harm it whether or not you have a Tracloc rear LSD. At least from how you described the instructions on that bottle, they are incorrect. There is nothing about a friction modifier additive that is incompatible with any axle used in any Jeep. In fact, most modern gear lubes, mineral and synthetic, come with the friction modifier additive already added since it is fully compatible with any axle out there. In fact, it is hard to find a gear lube that does not contain the friction modifier additive... especially the higher-end more expensive gear lubes.

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Old 08-07-2010, 06:47 PM   #3
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Quadratrac 4wd systems don't matter.

however, Tracloc does. it's a posi LSD system and needs an additive.

check the gear lube bottles. a lot of the good brands have it in already, and nothing gets damaged running LSD additive in open differentials.
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Old 08-07-2010, 07:02 PM   #4
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Old 08-07-2010, 07:05 PM   #5
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Ok thats what I told them,better to have and not need than need and not have.The rear is making a low hum sound at 55,and is hot to the touch.Heat is normal ofcourse but without being there to check myself its hard to say.I worry because they are heading to montanna in the am and taking their babies with.I wish I could look in at that diff to inspect but can only offer advice at this point.Thanks guys,I passed the info along.
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Old 08-07-2010, 07:08 PM   #6
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An axle that is too hot to hold your hand on after you have been driving it is normal.
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Old 08-07-2010, 07:14 PM   #7
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Yep understood.Had them pull plug and was told the lube was grey.Sounds like water to me.Told them to change it before a long haul.Hopefully there isn't more to the picture,as far as damage is concerned.I believe the boyfriend of owner has been beating the living crap out of her jeep for her.So I gather.
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Old 08-07-2010, 07:25 PM   #8
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like Jerry said, heat is normal. it probably was low on fluid or in need if an oil change. they will make noise with low, old, or contaminated fluid. with a few fresh bottles with an LS on the bottle, I think you guys will have a safe and happy trip
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Old 08-07-2010, 07:30 PM   #9
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Not me going,a friend of a friend is.I just was concerned with the thought of little ones going.Nothing worse than a stranded couple on the road with babies.If it wasn't so far away for me,I would have went up there and did the work for them.Hard to talk jeep stuff with people who don't know what they have and have limited mech abilities.
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Old 08-07-2010, 07:44 PM   #10
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Quote:
Originally Posted by baja
Not me going,a friend of a friend is.I just was concerned with the thought of little ones going.Nothing worse than a stranded couple on the road with babies.If it wasn't so far away for me,I would have went up there and did the work for them.Hard to talk jeep stuff with people who don't know what they have and have limited mech abilities.
yeah I know what you mean. I repair and maintain my neighbors cars, SUV's, and trucks in exchange for beer, food, and smokes they'll tell me a problem and I'll say something like "when was the axle fluid last changed." and they'll respond with "they have fluid in them?" so I usually just look myself.

just tell them to grab a few bottle of gear lube and look for an LS on it. I think Commanders get 3? depends on axle I guess. viscosity doesn't matter. you can mix and match viscosities and brands too. everything plays nice. drain it and fill it. easy job.
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Old 08-07-2010, 07:55 PM   #11
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Not sure if the their 99 has the dana 44 rear or even if it is same as zj or not, but speaking to the humming.. yes change fluid.. but if it gets worse it usually is a sign of the bearing going bad(on the dana 44) Had mine changed around 70k..and they were in avg shape, design flaw of some kind from what I recall.
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Old 08-07-2010, 08:02 PM   #12
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yeah they have a 44, or Chrysler 8.25 or something. I can't remember. I don't see too many Commanders. 3 or possibly 4 bottles will cover it.

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