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Unread 10-04-2013, 08:28 AM   #1
Boomer1944
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2000 TJ Sport axle help

I installed 37" tires on my jeep and unknowingly didn't upgrade anything on my axle so I tore apart my axle. When I drive my jeep I am getting all kinds of crazy vibrations throughout my entire vehicle. I feel it in the body and in my wheel. I know the problem is in my rear axle and I have a feeling its because maybe my mechanic didn't tighten something up all the way. If anyone has any idea on what will be the best way to go about fixing this as for repairing and figuring out what it is that is bad on my jeep I would love to hear your voices. I do not know what it is. Thanks.

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Unread 10-04-2013, 08:32 AM   #2
jaspepp
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sounds like drive line angle to me. SYE and a new drive shaft maybe. and if it were me I would probably start searching for a new rear and probably front axle aswell. my d35 grenaded on me several times. one of which was simply pulling away from a stop sign. I have the 2.5l and 33s, I can only imagine what 37s would do to that rear end
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Unread 10-04-2013, 08:34 AM   #3
365Jeep
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What axle are you running? I suspect the vibration you're feeling is your axle trembling in fear of impending death.

Did you lift it at the same time, or was the Jeep previously lifted. If the lift is new, I suspect jaspepp is right. Check your driveline.

If there were no chassis changes, I would look into the tire balancing. If you're on 15 inch wheels, a tire that large will be somewhat hard to balance well. Also, check you lugnuts.
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Unread 10-04-2013, 08:49 AM   #4
Boomer1944
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I have a SYE installed. I have a 4.0 I6. I just went under my jeep and looked at axles and no where on my axles do I see where it would say like Dana 44 or Dana 60 or anything like that.
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Unread 10-04-2013, 08:52 AM   #5
Boomer1944
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tires got balanced. I lifted it with a full 6" lift kit using teraflex shocks and springs and clayton off road long arm kit. I already got my tires balanced as well. I know its in my axle because when I have my jeep on jack stands, I can physically shift my axle back and forth about 1/8" via the parts inside it and I can hear and feel its loose or broken.
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Unread 10-04-2013, 09:02 AM   #6
365Jeep
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Dude, trailer it back to your mechanic! That doesn't sound good, and it's not likely safe to drive.

If the Jeep wasn't lifted when you bought it, it certainly doesn't have a Dana 60. If the differential cover has angles on it, it's likely a Dana 44; If it's cover is an oval, step back, because it's a Dana 35, and it's likely to explode just sitting there.

image3544.jpg
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Unread 10-04-2013, 09:05 AM   #7
Boomer1944
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Jeep is parked in my shop. Its not leaving until fixed. Dif cover is oval so it a Dana 35 than. It came in to me as a factory wrangler tj 2000 sport and ive never swapped axles. Just changed suspension, arms, shafts, upgraded frame rails and some other stuff but only put new factory parts into my axles ordered from MOOG I think. im not sure where my mechanic got all the stuff.
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Unread 10-04-2013, 09:07 AM   #8
Boomer1944
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just double checked, dif cover is rounded. no sharp angles on it
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Unread 10-04-2013, 09:12 AM   #9
Boomer1944
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Looks like from what I see front is Dana 33 and rear is Dana 48. however its hard to make out the numbers on it. But from your pictures you just gave me its that oval one, the Dana 35
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Unread 10-04-2013, 09:19 AM   #10
365Jeep
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I know you are likely feeling sick right now, but you should have done a bit more research before adding 6" of lift and 37s. Unless you've regeared, you are probably VERY underpowered, and both your front D30 and rear D35 will have a short lifespan.

The front D30 will likely not survive much past some back roads, and your rear D35 may not make it around the block. If you plan on putting your Jeep in the dirt, I would recommend looking into the Ford 8.8 as a reasonable place to start.

The general consensus is that 35s are really the break point for the front D30, and 32s are generally okay for the rear D35. Your modifications have made your Jeep very unreliable.

I know this is painful, but you have to do your homework.
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Unread 10-04-2013, 09:21 AM   #11
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Quote:
Originally Posted by Boomer1944 View Post
Looks like from what I see front is Dana 33 and rear is Dana 48. however its hard to make out the numbers on it. But from your pictures you just gave me its that oval one, the Dana 35
There are no such axles as a Dana 33 or 48.
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Unread 10-04-2013, 09:26 AM   #12
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Quote:
Originally Posted by Boomer1944 View Post
I can physically shift my axle back and forth about 1/8" via the parts inside it and I can hear and feel its loose or broken.
Maybe your axle is already broken. If your rear axle is on a jack or jackstands, are you moving the entire housing or the axle within the housing? If you are moving the entire housing, check your track bar. If your axle is broken, don't repair it! Replace it with something stronger, then save your money for a stronger front axle. That's the one that will cost you some serious money if you want to keep 37s and maintain stock (or near stock) width.

Try this: Ford 8.8 Swap

Good luck.
David
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Unread 10-04-2013, 12:16 PM   #13
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Pull the diff cover and post pics.
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Unread 10-17-2013, 10:51 AM   #14
365Jeep
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Well Boomer, what did you find out. I'm curious to know how things are working out.
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Unread 10-17-2013, 11:59 AM   #15
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It sounds like that axle has some serious issues. If that 1/8" movement side-to-side (toward the front and back of the vehicle) then it's probably outer bearings, if it the movement is the whole shaft moving in-and-out of the tube then its probably some serious carrier or gear damage.

You should really consider stronger axles if you want to stay on 37's. The D35 really is not up to it. I just swapped mine out for a D44, and the guy I sold my old D35 to broke his on 35's.
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