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Old 10-23-2010, 07:51 AM
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SYE - needed?

I have a 98 TJ,6 cyl-5spd manual trans with 31'' goodyear MT's. There is no lift of any kind installed, but the tires don't rub in any way. I get a strange vibe starting at 45 mph (that seems to go away at times)and it feels to be coming from the trans area. There is no vibe or shimmy in steering wheel and it's not the humm of the mt's that is present. Is it possable that because of the upsized tires(even with no lift) still dictate the need for a SYE ? Thanks.

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Old 10-23-2010, 08:13 AM   #2
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My understanding is that no, bigger tires alone, would not be responsible for needing a new driveshaft. When you lift the jeep, the angle of the driveshaft gets steeper, as there is a longer vertical distance between the trans and the rear diff. Since you have no lift (just bigger tires) the jeep to diff relationship should be the same, so I dont think an SYE would do anything for you. Again, this is my understanding....and its a lil after 7am on a Sat.....hopefully someone else will confirm lol.

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Old 10-23-2010, 12:14 PM   #3
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Since no suspension change has been done, SYE should not be necessary. If your sure its not a balancing or alignment problem, check the Trans mount as the rubber will deteriorate with age.
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Old 10-25-2010, 02:22 AM
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thank you ! that's what I was thinking but wasn't sure. I will check out the mounts next.
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Old 10-25-2010, 07:54 AM   #5
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could be bad u-joints in the driveshaft as well.
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