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I have a hop in the front end.

my truck seems to hop between 60 - 65 mph. sometimes the hop or shake is stronger than other times. I have replaced the tiers, added true balance sleeves, 3 axle alignment, and replaced bearings. Im ready to pull out my eye brows with frustration. any ideas?

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its a 2007 volvo. i have this problem with two different sets of tiers. i also replaced all 6 shocks,steering gear box, added tru balance sleeves.seems to be speed related. i can run 1500rpms in 12th @55,dose it alittle. run 1500 in 13th @65 does it alot more. also i can feel it more in the floor and seat than the steering wheel.

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would that cause some kind of odd tier wear on drives?

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How about shocks? I'm not saying it'll fix it, because it didn't help my truck, but maybe.

Do you have that all the time or does it vary dependng on road surface? My hopping seems to be the worse the smoother the asphalt looks.

Btw what truck? Mine's a 99 KW T2000. Do you have irregular wear on the steers? Could it be a bad motor mount bushing or walking crank?

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If the hop is coming from the font end you might possibly get someone to run beside you to see if you have a wheel hop or shimmy to isolate the problem. You might invest in a set of Centramatics for the steering axle.

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It could be a wheel out of balance. Check your steers, look closely at the bead around the wheels. If there is any difference or space there, that could be your problem.

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There is a possibility the problem may not be in the front end. If the hop is being felt primarily in the seat and floor I would also check the driveline. A bad ujoint, carrier bearing, etc could cause similar symptoms. Also have the ride height checked as a shake or hop can develop when the height is wrong causing the driveline angle to be off.

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And late model volvo's are notorious for bad leveling valves, good call! Checking the ride height has my vote.

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