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Old 08-25-2012, 01:35 PM   #1
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About to go nuts

I have a 2004 wrangler that has been to the shop 5 times for the same problem . My rear end has been rebuilt 3 times back stock only to have it start howling after about 4500 hundred miles . The 4th time we decided to change the housing since we noticed the dana stamp or numbers were no were to be found , thinking it was not the right hub. We upgraded both the front and rear end gear to accomadate the 33in tires with a 4inch lift I was putting on . Now after about 4500 it sounds like a sreeching/ howling / winding noise only when I accelerate or let off the gas . Ive changd all the u joints thinking this was the problem but its still there . The shop Ive tken it too are usually good and have taken care of it 4 times . Not sure If I should take it back and if so where to start . I do not take it off road and I drive it daily back and forth to work . Any suggestions would be great . If you tell me cange change shops then recommend one in the upstate area of SC.

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Old 08-25-2012, 02:41 PM   #2
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Originally Posted by biglou1974
I have a 2004 wrangler that has been to the shop 5 times for the same problem . My rear end has been rebuilt 3 times back stock only to have it start howling after about 4500 hundred miles . The 4th time we decided to change the housing since we noticed the dana stamp or numbers were no were to be found , thinking it was not the right hub. We upgraded both the front and rear end gear to accomadate the 33in tires with a 4inch lift I was putting on . Now after about 4500 it sounds like a sreeching/ howling / winding noise only when I accelerate or let off the gas . Ive changd all the u joints thinking this was the problem but its still there . The shop Ive tken it too are usually good and have taken care of it 4 times . Not sure If I should take it back and if so where to start . I do not take it off road and I drive it daily back and forth to work . Any suggestions would be great . If you tell me cange change shops then recommend one in the upstate area of SC.
Id take it to a dedicated offroad shop.

It might never see dirt, but a lot of excellent mechanics at normal shops will have no idea what to do with offroad lifts and parts. Heck, the jeep dealer i bought mine from had to outsource the work to get rid of my death wobble because they clearly didnt know how to do it and they were a huge dealership.

Do you have all of the accessories (SYE, etc.) that you need to run that big of a lift?

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Old 08-25-2012, 03:04 PM   #3
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My guess is the shop that did your ring & pinion work doesn't know what they're doing. Replacing the ring & pinion is not a simple process and not many mechanics, even when highly experienced, are up to changing those particular gears. Those particular gears have to be shimmed in/out/left/right in just the right combination to insure they have a long life. Anything less than perfection means toasted gears in short order.

A 4x4 shop is usually a good choice for replacing R&P gears since they do them all the time. General purpose garages seldom, if ever, have to change R&P gears so many have no clue how to do them properly. In one of my local 4x4 shops, they only trust two techs out of 8-10 that work there to do R&P installations.
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Old 08-25-2012, 03:08 PM   #4
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Originally Posted by Jerry Bransford
My guess is the shop that did your ring & pinion work doesn't know what they're doing. Replacing the ring & pinion is not a simple process and not many mechanics, even when highly experienced, are up to changing those particular gears. Those particular gears have to be shimmed in/out/left/right in just the right combination to insure they have a long life. Anything less than perfection means toasted gears in short order.
Agreed. What your describing sounds like your backlash is to high.
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Old 08-25-2012, 07:29 PM   #5
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If it only happens hard on the gas or when engine braking, i'd say frozen driveshaft u-joint, or bad pinion bearing. If the shop has just been popping the cover and messing around with the guts/hubs, they may never have addressed a worn pinion shaft/bearing. Or you may have an unbalanced driveshaft which is eating new pinion bearings after 4k miles.
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