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Discussion Starter · #1 ·
Well been having major issues balancing this expensive setup.

(5) Method race nv/ 35x12.5 km2

Spin balanced 3x, Road force balanced and still harmonic vibration/shimmy every three seconds between 60/65 mph. Seems to resonate through the seats,floorboard, center console. Steering will has very minimal vibration could be just the treads.

Tried moving the rears to the front and still there. Tried throwing it in neutral at 65, still happens. Road force numbers were all in range of normalcy. Only thing I have not had done is break the two with the 8+ oz of weight and rotate them 180 degrees. I have re-torqued the entire suspension, checked balljoints,bushings,driveshaft for wear or missing weights. My driveline angle should be good as I just have a 1 1/2 plk and flat fenders.

When I put the stock rubi tires on there is no problems or atleast so minimal I cannot tell. Thinking maybe their new so put some miles on them break them in. Went for a 120 mile drive. Now it feels as if it starts earlier at 58 mph. I'm too the point of just selling the damn things and stay with the boring stocks and a nasty wheel gap.
 

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If you have gone through your entire suspension and that many attempts at balancing the wheels and tires, my only guess is that you have a bad wheel or tire somewhere. Although, I think they would have caught it while balancing them. Just curious, have you removed the retainer clips for the rotors yet?
 

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Tires can be out of round. It happens from time to time. Why don't you return them? I had a set of the exact same as you (size and tire) and each of them only took between 1.5-3.0 ounces to balance. They rode perfectly. I've had many other 35s and some wouldn't balance no matter what. They were out of round and returned.
 

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Discussion Starter · #4 ·
I did remove the retainer clips off the studs. I bought the setup from dtd so not sure how to return or exchange or how that process even works.

Let me run this by you guys. Just now I was under the jeep and messing with the front driveshaft I felt some play. I know you can turn it by hand a quarter inch but this was play side to side. Moving back towards where the shaft reaches the harmonic balancer ( gold round ring looking thing) going into my transfer case there is a bit of looseness. Maybe like a 1/32 but I can feel and hear it clunk when applying lateral force. Went to the rear shaft same location and absolutely no play or side to side clunking going into transfer case by balancer. Could this be the issue? Regardless of the 8+ oz on two wheels? Thanks for your time.
 

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I AM THERE4 I JEEP
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I did remove the retainer clips off the studs. I bought the setup from dtd so not sure how to return or exchange or how that process even works.

Let me run this by you guys. Just now I was under the jeep and messing with the front driveshaft I felt some play. I know you can turn it by hand a quarter inch but this was play side to side. Moving back towards where the shaft reaches the harmonic balancer ( gold round ring looking thing) going into my transfer case there is a bit of looseness. Maybe like a 1/32 but I can feel and hear it clunk when applying lateral force. Went to the rear shaft same location and absolutely no play or side to side clunking going into transfer case by balancer. Could this be the issue? Regardless of the 8+ oz on two wheels? Thanks for your time.
Discount tire is one of the easiest places to return tires especially in your situation. They have a 45 day period after purchase to swap the tires out if your not completely satisfied. Take them back and swamp them all for the same tire again. If you happen to have the same issue with the new ones then just swap those for a different kind at that point. I've returned several sets to DT when I've had the exact same thing happen.
 

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Discussion Starter · #8 ·
We don't have a Discount tire in my area. We have their sister company Americas Tire. Will they do the same if I give them my purchase order?

Bought on Feb 17.. haven't put very many miles on them since my Jeep was in for warranty work twice in two weeks.
 

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Discussion Starter · #9 ·
If it was driveshaft I think the stockers would have the same feeling. Contact DTD and ask what you should do...
I did and he said he's onboard with what ever I want to do. Just trying to eliminate all possible outcomes/problems before exchanging somehow.
 

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Discussion Starter · #11 ·
After much more research turns out the slight driveshaft play side to side is somewhat normal/common on the Jks. Another post had a guy crawl under and test 6 driveshafts of bran new jeeps.
 

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Had bad u joints on my one ton dodge that gave a vib that was very difficult to diagnose. Happened 2 times, first time I let it go on for a year, couldn't figure it out. Took it to the dealer at the end of my rope. Found it right away as they were shot. They replaced under warranty, happened a couple years later, recognized right away and took it to a shop and they said it wasn't u joints. They tried everything, finally I said just replace the u joints, they were amazed when the vib went away.
 

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I AM THERE4 I JEEP
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Had bad u joints on my one ton dodge that gave a vib that was very difficult to diagnose. Happened 2 times, first time I let it go on for a year, couldn't figure it out. Took it to the dealer at the end of my rope. Found it right away as they were shot. They replaced under warranty, happened a couple years later, recognized right away and took it to a shop and they said it wasn't u joints. They tried everything, finally I said just replace the u joints, they were amazed when the vib went away.
lol gotta love it.
 

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The wheels with 8 ounces need to be balanced properly or replaced. That is a lot of weight, by this point somebody should have rotated 180 on the wheel like you mentioned. If they will replace them for free, I would do that first for sure though.
 

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I had two sets of KM2s, 35 & 37, and could never eliminate the exact issue noted by the OP. Multiple balancing attempts, including road force. Essentially comes down to the tread pattern of the tire, combined with even the slightest out of round or wobble in the wheels. I switched to 37" MTR/Ks and noted an immediate improvement. One of my fellow club members wrestled with the same issue on his CJ, never could cure it and switched to Mickey ATZs
 

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Discussion Starter · #17 ·
I had two sets of KM2s, 35 & 37, and could never eliminate the exact issue noted by the OP. Multiple balancing attempts, including road force. Essentially comes down to the tread pattern of the tire, combined with even the slightest out of round or wobble in the wheels. I switched to 37" MTR/Ks and noted an immediate improvement. One of my fellow club members wrestled with the same issue on his CJ, never could cure it and switched to Mickey ATZs
MTR/Ks are my next of choice. See what the response is tomorrow.
 

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Discussion Starter · #18 ·
Rear correct ?

I have 0 play in both my driveshafts.
The rear is solid no movement at all not even able to turn by hand. It's the front that has the side to side or up and down movement or clunk if you will. I drove over to my brothers who has a 12'jku and crawled under to check his. Same thing.

For what its worth the front shaft ujoint seems to be good with no signs of wear, just the other end going into the transfer case is where I see and feel movement.
 

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MTR/Ks are my next of choice. See what the response is tomorrow.
If you are concerned about tire balance MTR/Ks are a poor choice. The asymmetric thread makes them more difficult to balance and keep balanced. The one thing in their favor is that they are on the light side of the average but so are the KM2s.

Maybe what you need is on vehicle tire balancing if you can find a shop that still does it. The system will either balance or it will indicate the source of the unbalance.
 

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Discussion Starter · #20 ·
Ok thanks for that information. Took me a while to find a hunter 9700 for the road force. I haven't heard or seen anything about on vehicle balancing. From what I have heard all the balances are done are at relatively low speeds. My problem doesn't come in till about 58 and very noticeable at 63. I appreciate all the help and insight.
 
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