6" lift + 36's = take off vibration? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 04-15-2010, 08:22 PM Thread Starter
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6" lift + 36's = take off vibration?

What's causing the vibration?

I put a 6.5" pro comp lift on my truck, and ever since then, i get a decently strong vibration accelerating from a stop. The vibration happens from about 0-15mph, then goes away.

If im stopped, then going up an incline, its really noticeable. If i have a rolling start, like on a hill, sometimes you cant feel it.

If im cruising up a hill and put my foot into it, you can feel it a tiny bit as well.

Any ideas? will a carrier bearing drop fix this? or should i just wait until august and get a new driveshaft built? (in 3 weeks, my truck will be parked until august while im out of the state)


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post #2 of 10 Old 04-15-2010, 08:24 PM
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your driveshaft angle may not be right or a bad u joint.

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post #3 of 10 Old 04-15-2010, 08:25 PM
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PMF makes some bad A$$ carrier bearing drops.

1997 Single Cab Dually, S366 w/ Irate mount and plenums, EFuel, Intercooler, P.I.S 175/80s, Corbeau seats w 08 console, 19.5s, 6637, Black Interior with swede headliner and visors, Custom badges, Flight Fab Traction Bars.
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post #4 of 10 Old 04-15-2010, 08:28 PM Thread Starter
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I wouldnt think it would be the u-joint if i didnt have any vibration issues prior to the lift though, would it?

then again, i've put almost 3kmiles on since the lift, i guess i could have roasted the ujoint by now.

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post #5 of 10 Old 04-15-2010, 08:45 PM
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When I put my 8" on my 04 it did the same thing until I put the shims in the carrier bearing. After I put them in it is as smooth as when it was stock.
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post #6 of 10 Old 04-15-2010, 08:51 PM
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Put the tires on the wrong sides?
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post #7 of 10 Old 04-15-2010, 09:11 PM
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Axle wrap perhaps?

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post #8 of 10 Old 04-15-2010, 09:21 PM
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Its the driveline angle just put some shims in your carrier bearing and you will be good to go

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post #9 of 10 Old 04-16-2010, 08:40 AM
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The rule-of-thumb is 1/4" of shim per inch of lift. So, I would start with 1.5" if it were me.

I ended up needing 3.5 inches for the 8" lift on my '01, so don't be surprised if you need more.

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post #10 of 10 Old 04-17-2010, 08:08 AM
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all of above! you can start by dropping the carrier bearing, with that its a matter of luck...i heard many people say once they shimmed the cb it was fine...i also heard many people,including myself try and try to shim and can never get that faintest shudder to go away,my advice try the shims first seeing that is the cheapest way out,then you could try to have a one piece made which for sure will eliminate all of it,assuming you have traction bars, could be a little axle wrap too,traction bars will solve that as well...good luck,nothing more frustrating than having your truck wiggle down the road!
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