08 f350 4x4 shuddering on take off after lowering it - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 05-08-2013, 10:03 PM Thread Starter
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08 f350 4x4 shuddering on take off after lowering it

( i know i know why lower a 4x4, but its my truck and its the only way it fits in the garage until i get my house with a shop again.

my truck when i bought it a month ago had a leveling lift in the front, rear is stock.

so i took the rear blocks out of the back of my truck yesterday and took it around the block it seemed to be fine, no problems at all, then today i lowered the front by taking the leveling kit out and taking a half an inch off the front springs to make it level and not its shaking in the rear end when i take off all the way to almost 25mph but only when your on the gas. i tried to take off slowly to make sure i wasnt getting some kind of axle wrap with no blocks but it still shakes.

any ideas on what it could be??
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post #2 of 7 Old 05-08-2013, 11:58 PM
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When you took out the rear blocks the angle of the driveshaft changed. The vibration is most likely coming from your driveshaft carrier bearing or u-joint.

You may have to have some custom work done to move the carrier bearing higher so that the angle is not so far off.

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post #3 of 7 Old 05-09-2013, 12:17 AM
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I may be wrong but i think you have to have some sort of block there. Agree with changed angles of driveshaft, you may even have to shorten.

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post #4 of 7 Old 05-09-2013, 05:28 AM Thread Starter
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thats what i was thinking was the angle was off, i crawled under it late last night, i dont have a measurement on the drive shaft yet but its angled down to the carrier bearing an then is flat 0* back to the rear axle, ive seen allof worse angles not shake or anything but this truck is different i guess.

i havent been able to find any kits to lift it so im thinking ill make my own out of square tubing, the stock drop is 3" so im thinking im going to try a 1" lift on the carrier bearing to start out with and see what it does
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post #5 of 7 Old 06-18-2013, 02:29 PM
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how did this turn out?

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post #6 of 7 Old 08-12-2013, 07:12 AM
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are you putting the shim under the carrier bearing, I have this problem and I think its the front ujoint

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post #7 of 7 Old 08-12-2013, 11:11 AM
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Did it do the shuddering when you removed the rear blocks? Or after you did the front? That should help narrow it down.
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