Does anybody have any input regarding this problem??
Vibration at 40 mph
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Vibration at 40 mph
1998 F150 Supercab Long Box 2wd, I have a vibration when slowing down the vibration occurs at 40 mph, no vibration when accelerating. The vehicle has new tires, u-joints, rear end and axle bearings, limited slip rear end. 120000 kms, any ideas , I was told it may be the center hanger bearing in between the 2 driveshafts.
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What tranny do you have?
Look on the door code B-piller sticker. Are you coasting or on the brakes? I have heard about the two piece drive shaft bearing before, that could be right. Keep the inforation coming and maybe someone can chime in.
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let me get this straight
you have a vibration while coasting and then at 40 it goes away. So then from 39 to 0 it is fine? if that is the case I would almost bet it is the hanger bearing. See if it wiggles around up there. Unbalanced drive shafts do strange things like that too.
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From: Chino, California
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Found the problem this morning, one of the balance weights on the drive shaft at the front end is missing. Going to replace and I will post results. 
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Don't replace Balance the shaft
Use large hose clamps to balance the shaft.
1)Put rear axle on jack stands.
2)Get a helper to spin shaft to vibration speed.
3)Use chalk and lightly touch shaft while vibrating.
4)Put two clamps with screw mechanism 180 Deg from chalk mark.
5)Clean off chalk spin to check for balance.
6)Still vibrating chalk mark again adjust screw location or add third clamp
7)Repeat process till balanced.
8)Drive shaft run out should also be checked.
1)Put rear axle on jack stands.
2)Get a helper to spin shaft to vibration speed.
3)Use chalk and lightly touch shaft while vibrating.
4)Put two clamps with screw mechanism 180 Deg from chalk mark.
5)Clean off chalk spin to check for balance.
6)Still vibrating chalk mark again adjust screw location or add third clamp
7)Repeat process till balanced.
8)Drive shaft run out should also be checked.
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I have a 98 Lariat 2wd w/limited slip diff and 95k miles - I have been battling the same issue since replacing my original Goodyears at 85k. They are Michelins and have had 2 replaced which could not hold their balance. This improved the high speed vibration significantly but still have a slight "thumping" at EXACTLY 40 mph! The Michelins are supposed to be highest quality so I'm still not sure whether to suspect another tire or the alignment....
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