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Old 08-08-2016, 01:37 PM
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BF Goodrich All Terrain T/A

31 x 10.5

Is anyone else running these tires on their jeep? Do they vibrate?

I've noticed a vibration running down the road. It feels like I've got a set of monster lug mud tires. (Or a bad u joint)

I checked the u joints when I had the transfer case out, they're fine.

I do have a 2.5 inch lift with a transfer case drop.

I can feel it all the time, but it really vibrates at 50, smooths out @ 55 but comes back at 60 again.

Tires? or sumthin else?

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Old 08-08-2016, 02:14 PM   #2
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It may be a driveshaft/ujoint vibration. The drop for the transfer case is a 'close' fix for the lift. The ideal fix is a sye and new custom length driveshaft. I lost my driveshaft on a freeway off ramp(luckily) and my ujoint was toast...Are the tires balanced? Can you tell if it's front or rear?

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Old 08-08-2016, 08:52 PM   #3
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I have these tires in 35" x 12.5 and I don't have any vibrations

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Old 08-08-2016, 09:25 PM   #4
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My thought is something else because I run theses in 33/12.5/16's and it runs as smooth as a yj can run down the road. Could be a badly balanced rim also besides what was mentioned about aye and other fixes.
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Old 08-08-2016, 09:38 PM
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Thanks for the answers. I'm definitely thinking its in the driveline and not the tires.

When I'm accelerating hard the vibration is worse. If I let up off the throttle a little the vibration eases up. If I take my foot off the gas and decelerate sharply I can feel the vibration kinda backload and kick up again.

I don't think tires act this way. If I'd never checked the u-joints I'd bet money I had a bad one. I'll have to check into this a little deeper.

BTW what's SYE and AYE?
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Old 08-08-2016, 09:45 PM   #6
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The BFG AT tires always take huge amounts of weight on the balancer, take it to a tire shop and ask them to spin them and if it's off more than .5 to rebalance them. It's an easy fix, and the best part is you don't have to get dirty.

Funny all the 33x12.50x15 ko2's on my XJ took less then 1oz with steel wheels one tire took no weight at all
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Old 08-08-2016, 11:07 PM   #7
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I think the 'AYE' was a typo...sye =slip yoke eliminator. Instead of your driveshaft sliding/slipping off😁your tailshaft you have a fixed yoke. This allows the driveshaft to be bolted to the yoke using a double cardan driveshaft. You will be able to remove the transfer case drop and put your skid back up where it belongs, gaining your clearance again. It basically is the correct way to fix the driveshaft angle after doing a lift

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Old 08-08-2016, 11:15 PM   #8
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Old 08-08-2016, 11:15 PM   #9
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Old 08-09-2016, 08:46 AM
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Thanks guys. I couldn't figure out how eliminating the slip yoke would help, then I seen the double u-joint (basically a CV joint) at the top. I get it now.

The SYE is around $225. I don't know if they sell the driveshafts premade, or if one has to have one custom made but surely all this would add up to $500 or more. I can buy four stock springs for much less, and then sell the TrailMasters for whatever I can get out of them.

Sounds like the excuse I need to get my jeep back to stock height.
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Old 08-09-2016, 12:09 PM   #11
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Yes aye was my iPhone having no clue what an sye is lol, my bad on the typo but yes that was what I meant

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