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Thread: rear end or tranny?

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    rear end or tranny?

    i had tow tow my jeep home because something let go either the rear end or tranny it would only move in 4hi or 4 low. the rear tires move but the rear drive shaft doesn't any tips what to look for would be a great help thanks and I'm driving a 2000 jeep tj thanks again.
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    What were you doing?

    So if I read it right you roll the jeep on the ground the DS is not turning?

    If open diff could be simple as an axle. (depending on the type of axle in that Renegade, if the axle didnt walk out may not be the axle)

    If locker, could be the pinion.
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    I assume when you say that they move, you mean in the same direction as each other. If this is the case and the drive shaft doesn't move at the same time then your problem is in your rear differential. Do you happen to know what gearing you have?

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    Quote Originally Posted by Dirty Money View Post
    (depending on the type of axle in that Renegade, if the axle didnt walk out may not be the axle)
    He said it was in a 2000 TJ. So I'm going to assume NV3550 and Dana 35. in which case I'm going to say the Dana 35 is more likely to give out first.

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    if its moving in 4 wheel drive, the tranny is fine, i would look more at the T-case

    could also maybe be the spider gears in the diff, but both times i blew my spider gears up, the rear would still move, it would just go BANG BANG BANG around any corner.

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    Look no further than the rear axle if you roll the jeep and the rear drive shaft does not spin. An axle shaft or spider/side gear grenade are the most likely culprits and then some type of ring and pinion failure. Removing the diff cover and inspecting the diff should provide the answer in short order. If it was towed home with the rear wheels rolling on the ground it won't be an axle shaft as the shaft would have let go out of the housing because the D35 is C-clipped.
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    The t-case in a TJ is a part-time unit that when in 4wd will not allow the drive shafts to move independent of each other because they're attached by a roller chain.
    Please describe how you checked the shaft for movement?
    ie. were you driving it? was it jacked up and you were spinning the tires?

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    Quote Originally Posted by MAD MANCHE View Post
    The t-case in a TJ is a part-time unit that when in 4wd will not allow the drive shafts to move independent of each other because they're attached by a roller chain.
    Please describe how you checked the shaft for movement?
    ie. were you driving it? was it jacked up and you were spinning the tires?
    I jacked up the rear end and the tires did spin but the drive shaft didn't and it was in gear. and there is a little play in and out on the tires so I'm thinking must be something in the rear end

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    Quote Originally Posted by setm View Post
    I jacked up the rear end and the tires did spin but the drive shaft didn't and it was in gear. and there is a little play in and out on the tires so I'm thinking must be something in the rear end
    Rip it apart and post lots of pics of the carnage!!!

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    Quote Originally Posted by setm View Post
    I jacked up the rear end and the tires did spin but the drive shaft didn't and it was in gear. and there is a little play in and out on the tires so I'm thinking must be something in the rear end
    Ok, when you spun the tires were they both turning the same way, opposite ways, or just one tire spun? And when you did this were you in 4wd?

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    Quote Originally Posted by setm View Post
    I jacked up the rear end and the tires did spin but the drive shaft didn't and it was in gear. and there is a little play in and out on the tires so I'm thinking must be something in the rear end
    A little play in and out on the axle shafts is normal on a C-clip axle. If the shaft or C-clip was broken, you would be able to pull the whole shaft out of the housing. When you spun the tires by hand off the ground, did one tire spin one direction and the other tire spin in the opposite direction? If so, that is normal operation of an open differential. The rear driveshaft may not spin without having someone hold the opposite tire from spinning. If the opposite tire can be stopped, the driveshaft will then turn when you turn the your tire by hand. Failing that, as I stated before, remove the diff cover and inspect the spiders and side gears and ring and pinion for damage. It's likely that the problem will be obvious once you remove the cover.
    Last edited by Stickybongsmoking; 11-14-2013 at 11:10 AM.

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    I agree with CTD NUT however you may also have a limited slip differential which will cause some confusion with this test.
    Easiest way to see what you have without getting messy is to jack the rear up again, make sure you are in 2wd, and gas it a bit to see if the rear drive shaft moves.
    If it does then pull the cover off the rear end.
    If it doesn't first check your t-case shift linkage to ensure its functioning properly as they are prone to misalignment. Easiest way is to let the Jeep sit normally, block the wheels, then pop the linkage rod off at the t-case shift arm on the t-case. You can then check all four positions (2hi, 4hi, neutral, 4low) by moving the shift arm with channel lock plyers and see if the Jeep will move under power. To check 2hi I believe the t-case shifter arm should be furthest up it can be (clockwise when looking at it from the drivers side). You may have to "rock" the Jeep a bit to get each t-case position to click in. If the rear drive shaft still doesn't move in 2hi under power then pull the fill and drain plugs on the t-case and see if metal bits come out.

    Hope this helps.
    Last edited by MAD MANCHE; 11-14-2013 at 12:49 PM.

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    it was the rear pinion it is not moving at all so i started to remove the rear end so i have to get a used rear end for it after i figure out what gear is in it.

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    Remove the diff and observe the tooth count which is stamped on the ring gear. Example: the numbers 41-10 would be 4.10. 41-11 would be 3.73; etc. Just take the ring gear tooth count and divide by the pinion tooth count.

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    At least if you are replacing the whole axle you can upgrade to a stronger one. If I'm not mistaken I think you can swap a Dana 44 in from a V8 powered Grand Cherokee with no modifications. I think most of them came with an LSD as well.

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    almost have the old one out

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    thanks CTD NUT it's a 373 I.M going to post to find a new rear end
    Quote Originally Posted by CTD NUT View Post
    Remove the diff and observe the tooth count which is stamped on the ring gear. Example: the numbers 41-10 would be 4.10. 41-11 would be 3.73; etc. Just take the ring gear tooth count and divide by the pinion tooth count.

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    What actually broke?

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    standard Differential Case was completely cracked and the pin was all bent

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