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Posted

I work for a tire company in Michigan and have worked there for almost 19 years. Although I no longer work on the vehilces myself anymore I have had PLENTY of experience with this. We have one of the Hunter GSP9700 Road Force balancers and solve hundreds of balance-related problems just like you are describing. The guys here are right, it is more than likely that you just have a balance problem. In most cases, an out-of-balance problem will only be felt at a certain speed range but a tire with an out-of-round condition (or "broken belt") will be felt at pretty much all speeds starting around 30-35mph but will gradually get worse as the speed increases.

 

Just make sure that you get the tires balanced at a reputable place that knows what they are doing AND has good equipment. We have re-balanced tires for numerous customers that were unhappy with the way they were balanced at other places. Usually after we correct the problem for them we have a customer for life.

 

I think the best tire balancer on the market is the Hunter GSP9700 because of Road Force measurement capabilities. You may want to call around to find out who has this balancer and get them balanced there.

 

If you want to check out the Hunter balancer, here is a link: http://www.hunter.com/pub/product/balancer/4159T/index.htm

 

 

Kevin

Posted
great how much is it to replace a drive shaft?

 

If you wanted, it would be less expensive to get your old one balanced. They should balance, adjust, clean, balance again and then re-paint it.

Posted

I'm also throwing in a vote for having the road force balancing done. I bought a brand new set of 20's that were balanced on install and they shook at 50-60mph, but no where else...took them to my buddy who works at a dealership, did the road force balance and cleared the problem immediately. It was cool to see the print out afterwards, lots of info. :thumbsup:

Posted
also do drive ahfts go after 50000 miles?

 

They shouldn't, no. But I've seen some come into work that have low mileage on them, and a weight has fallen off causing it to be thrown off. Like it is probably mostly your tires, I was just throwing the idea around to have your drive shaft balanced too. But yes 50,000 miles in a pick up, the drive shaft shouldn't be off balance. And i'm not too sure on the cost, I'm in the shop section of our store, not the driveline shop,lol.

Posted
They shouldn't, no. But I've seen some come into work that have low mileage on them, and a weight has fallen off causing it to be thrown off. Like it is probably mostly your tires, I was just throwing the idea around to have your drive shaft balanced too. But yes 50,000 miles in a pick up, the drive shaft shouldn't be off balance. And i'm not too sure on the cost, I'm in the shop section of our store, not the driveline shop,lol.

I know bad u-joints on the drive shaft can make it shake. Had that happen on my old S-10

Posted
I know bad u-joints on the drive shaft can make it shake. Had that happen on my old S-10

 

Sure will,lol Frick even a lose nut on the pinion yoke will cause problems as simple as vibration...or the axle will lock up :blink:

Posted

If it is a 2 wheel drive truck with the 2 piece drive shaft it could be missaligned. Some of these drive shafts were not aligned properly from the factory due to a cross member being missaligned. Bel-tec makes a kit to repair this. It fairly cheap. I dont know exactly how much the kit cost because the suspension kit I ordered from them came with one.

Posted

First I've ever heard of road force balancing...they weren't around that I was aware of when I was working in garages from 93 to 98...

Very good info...

If you feel it under the seat, it might be a driveshaft.

 

If you feel it in the pedals and/or in the steering wheel...it's most likely out of balance tires.

 

I had an old 4WD Ranger club cab with a two piece driveshaft I replaced U Joints on, I assembled it out of phase...and it vibrated big time for two or three months before I finally figured it out....

Posted
I bet it's your alignment.

An old girlfriend had the same problem with her Jeep. Got it aligned and no more shakes

 

 

Alignment causing a vibration problem would be pretty rare. There could be some worn suspension parts that get replaced when the alignement is done and the worn parts were causing the vibration but there is almost never a time when alignment alone will take care of a vibration problem.

 

I will say over the years that I worked in service department of the tire company that I work for I have seen a few odd things cause a vibration problem. We had one car that I remember that warped rotors were finally nailed down as being the cause for the vibration in that car after we had already changed out the tires with new ones twice. I can't remember ever finding that an alignment corrected a vibration and I have installed hundreds of sets of tires and had to troubleshoot many, many vibration problems as well.

 

I think the best & cheapest place for him to start is with getting the tires balanced on a Road Force balancer and go from there. The tire balance had the highest probability of being the problem.

 

Just my $.02.

 

Kevin

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