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  • Ring and pinion break in

    I just got new ring and pinions installed last week and they decided to not let me know about the break in untill I was there to pick it up. From the paper they gave me I shouldn't drive any further then 15 to 20 miles at a time without letting the gear oil cooling down for the first 500 miles. I just wanted to see what all you guys did when you got your new gears. There is a x-mas party 200 miles away from me next weeked that I'm going to and now I'm thinking the jeep isn't going.

  • #2
    ive never done one but thats what everyone says to do. they also claim your supose to change the fluid after like 300 miles. id do what they told you espically if they put a warrenty on it.

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    • #3
      500 miles is excessive I think, but we usually do it for about the first 300km=180miles. the reason for break in, is you want to harden the surface of the teeth. correct hardening procedure is bringing the metal near the Yeld point (point of no return was we call it) just bellow that point, the metal will become almost porus, absorb the oil, then as it cools it recrystalizes with the oil inbeded. this makes a solid smooth chrystal structure in the metal, and because the oil is inbeded, it becomes slicker (this is also how they create spring steel, but more complex really) past the yeld point, ie, too hot.. the metal becomes soft. when you reach this yeld point seveal times, essencially you are ensuring that there is a thick layer of this smooth slick solid metal, with a softer core. the term for this is case hardening, soft center, hard outer. this allows flexability but good wear. so do ensure the fluid does cool down, but you shouldnt need to do it for anything more than 200miles/ ten heating cooling cylces. dont forget, dont go heavy on the gas peddle, or engine brake. this puts uneven stress and force on the teeth, potentically causing premature wear because of a lack of a hardened face.

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      • #4
        If any of this holds true for the 4.56's I had installed a few months ago, then I guess I had better get a lawyer when mine give out. The guys at PYLE Bros. in Baytown didn't say a word about break in periods or fluid changes.

        I'll have to keep all of this in mind if/when it does happen. If it does happen, I hope it happens in both axles, simultaneously...shattering my pumpkins and doing all sorts of vile things.

        Can anyone say, "Replace at the expense of the installer."?


        There's no information on the receipt I was given either. Hoooahhh!!

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        • #5
          I was thinking about this very subject the other day. Tell me, how many people do you know of that worry about breaking in the gears in their brand spankin new off of the lot cars? None. People buy brand new cars, with brand new gearsets in them and NEVER go through a break-in period.

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          • #6
            Break them in....500 miles is probably good....the oil will tend to get thick and goopy quicker which isn't the best.

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