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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Shutter on acceleration

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Old Apr 8, 2012 | 06:50 PM
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Shutter on acceleration

I am getting a shutter on acceleration, I have read in another post it is because my truck is lifted and the previous owner did not do it correctly. So I am going back and fixing all the issues. From what I have read the shutter is because the drive shaft is no longer at the correct angle, so I need to shim it. From the other thread a poster stated that he "thought" that it need to be a 1/4 inch for every inch of lift. I measured the total lift of the blocks and it measures 5 inches. It looks like the PO stacked a 3" block under the factory 2" block (which I know if a no no and am going to fix that as well). Is 1/4 inch per the correct drop for the shim? So I should just find a machine shop and have them make me a 3/4" square block to put under the carrier bearing support?
 
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Old Apr 8, 2012 | 07:38 PM
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I would put some traction bars on the truck also, anytime you have a lift you pretty much need to get traction bars.
 
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Old Apr 8, 2012 | 07:57 PM
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Originally Posted by BigSilly86
I would put some traction bars on the truck also, anytime you have a lift you pretty much need to get traction bars.
That is going to be my fix for the stacked blocks. Going to invest in some 5" PMF traction blocks.

Thanks for the reply to my post. Just reading that the shim will only solve high speed vibration and not the vibration on acceleration. That is caused by axle wrap.
 
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Old Apr 8, 2012 | 09:23 PM
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Also you might want to grease the splines on the driveshaft while you at it.
 
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Old Apr 9, 2012 | 10:43 PM
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Originally Posted by BigSilly86
Also you might want to grease the splines on the driveshaft while you at it.

I think you nailed this on both both accounts.... double bump!!!
 
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Old Apr 10, 2012 | 08:51 AM
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I would put the ladder bars on first, grease the drive shaft and see what happens. 1/4 per inch seems like an awful lot.
 
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Old Apr 10, 2012 | 08:54 AM
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Originally Posted by jasfaa
I would put the ladder bars on first, grease the drive shaft and see what happens. 1/4 per inch seems like an awful lot.
Thanks jasfaa, I should be getting taxes back in a week or 2 that is when all the fun begins.
 
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Old Apr 11, 2012 | 05:51 PM
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How and what kind of grease would one use? I crawled under and I did not see a grease fitting or anything. I could see the splines, just put some grease in there?

Thanks in advance
 
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Old Apr 11, 2012 | 06:19 PM
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Originally Posted by F250Snowman
How and what kind of grease would one use? I crawled under and I did not see a grease fitting or anything. I could see the splines, just put some grease in there?

Thanks in advance
There is a black rubber boot covering the splines , just buy some metal replacement fasteners to replace the plastic ones holding it now, remove the boot and slather any type of high temp grease on it. Be very generous with the grease. You need to pull the spline out for the best results.
 
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Old Apr 11, 2012 | 06:29 PM
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Here is a picture of the boot.
 
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Old Apr 11, 2012 | 06:35 PM
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Oh!... I have that under there. I thought was I was looking for was inside the support on the left of the picture. Your looks like mine does. Perfect! Thanks again for the help. I will stop at the auto part store and pick some up.
 
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Old Apr 11, 2012 | 06:40 PM
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you should remove the driveshaft and clean and grease the whole spline....
 
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