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Thread: Do Differentials wear out?

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    Got Beer airforce26yrs's Avatar
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    Default Do Differentials wear out?

    I am running Detroit Tru-Trac's in both axles, D30/D35, and am starting to get a whine from one of them. The front has abour 200,000 miles on it and the rear has about 100,000. Do they wear out?

    I have not changed the gear lube in awhile, could that be the problem?

    All thoughts on this are appreciated.
    I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.

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    Time n Money Ghost00TJ's Avatar
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    yes, I had a 97 chevy 1500 running 35x14.50 TSL's and it started to howl and one day CLANG rear diff quit, got home by removing rear drive shaft and engageing 4x4 LOL. Maine shattered the ring and carrier so it cost more to fix.
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    Geländewagen Bigskyxj's Avatar
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    Yes they wear out, run it hard till it breaks and upgrade. Changing your oil now won't do you any, good stuff wears out.

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    On your SIX! highlandercj-7's Avatar
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    They are a gear driven unit so I doubt that they are worn to that point in 200k but my full detroit had the same sort of milage and it imploded. You may consider removing it disassemble it and see if there is any ovious signs of damage.
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    Junior Member Madmacc's Avatar
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    Pinion Bearings and carrier bearings/remove and replace
    "An army of asses lead by a lion is far better than an army of lions lead by an ass."

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    Got Beer airforce26yrs's Avatar
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    Thanks to all that replied.

    I do not do diff work myself, but take it to a ring and pinon shop. I had them install the Detroits originally. Will have to make an appointment.

    Next question, I am running 355 gears, does the ring and pinon gears need to be changed to go to 373's or just the Detroits?

    Bigskyxj, what do you mean by upgrade?
    I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.

    If you do not have time to do it right the first time, how do you have time do do it over?

    www.jeepforum.com michiganmaveric

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    Time n Money Ghost00TJ's Avatar
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    Quote Originally Posted by airforce26yrs View Post
    Thanks to all that replied.

    I do not do diff work myself, but take it to a ring and pinon shop. I had them install the Detroits originally. Will have to make an appointment.

    Next question, I am running 355 gears, does the ring and pinon gears need to be changed to go to 373's or just the Detroits?

    Bigskyxj, what do you mean by upgrade?
    ring and pinion reffer to the gears ratio 3:55 or 3:73 as mentioned above, your locker or carrier may limit you on the size ring gear you can run. If needed you can purchase a carrier for higher (number) gears. I bought an ARB locker which serves as a carrier some like Aussie lockers do not replace the carrier.
    Currious why you would go to only 3:73? If you are runnng 33-35 inch tires I might go 4:88's since you are considering work anyway- that would be an up grade. If you change the ratio you have to do both axles gear sets or things will SNAP.

    Your axle shop will tell tell you for sure.
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    Got Beer airforce26yrs's Avatar
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    Quote Originally Posted by Ghost00TJ View Post
    Currious why you would go to only 3:73? If you are runnng 33-35 inch tires I might go 4:88's since you are considering work anyway- that would be an up grade. If you change the ratio you have to do both axles gear sets or things will SNAP.

    Your axle shop will tell tell you for sure.
    I do not know where you got the idea that I was going to run large tires, but I am not. I have a WJ that is my daily driver. I sometimes tow a trailer and just want a little more umph on the take off. I had a XJ that had 3:73's and it was quicker on the take off and that is all that I am looking for. I am not a hard wheeler so no big tires for me.
    I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.

    If you do not have time to do it right the first time, how do you have time do do it over?

    www.jeepforum.com michiganmaveric

  9. #9
    The Cow Shall Rise Again theyeti1775's Avatar
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    Upgrade means loose the D35 rear
    Yeti

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  10. #10
    Time n Money Ghost00TJ's Avatar
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    Quote Originally Posted by airforce26yrs View Post
    I do not know where you got the idea that I was going to run large tires, but I am not. I have a WJ that is my daily driver. I sometimes tow a trailer and just want a little more umph on the take off. I had a XJ that had 3:73's and it was quicker on the take off and that is all that I am looking for. I am not a hard wheeler so no big tires for me.
    Sorry my mind is stuck on climbing rocks lol,
    that would improve things for you, but again I would see what your axle guy has to say, he can run a formula that will account for transmission gearing, ring&pinion gears, tires, some other things and get you better info for your choices for what you want to do.

    I know your original question was do they wear out and this is migrated into a more indepth talk but there is another thread on MJ talking some of the points that are on here the basics apply. http://www.militaryjeepers.com/commu...ead.php?t=6690
    Last edited by Ghost00TJ; 04-01-2009 at 12:10. Reason: more info
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