Driveline Angle; need axle shims - Ford Powerstroke Diesel Forum

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post #1 of 16 Old 01-01-2008, 10:01 AM Thread Starter
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Driveline Angle; need axle shims

Just went out there today to see how my driveshaft angles are. 7/8" of carrier shims is perfect. the 2pc shaft is 0-.5*; pretty much straight like you want. the Tcase is down 8*. the pinion is up 12*!!!!! OMFG! nowonder I have a 45-50mph vibe. that pinion is supposed to be 0-2* BELOW the Tcase. It's supposed to be at 6-8*, not 12*!! so I need 4*-6* shims for the rear axle. where can I get shims for our Superduty? I know I don't want aluminum shims. is there a special size shim for the SD? what about FORD? I'd like to use factory parts...

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post #2 of 16 Old 01-01-2008, 01:24 PM
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Any of the lift companies make them. I would have thought it would have come with your Skyjacker lift. It came with my Fabtech one.
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post #3 of 16 Old 01-01-2008, 02:59 PM Thread Starter
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Huh, I didn't do the install of the kit, so I never got to see "everything" that came with it. I will call skyjacker and ask them if they are included. Yeah, the current angle set up is way out of whack. I'm suprised it doesn't vibe worse.

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post #4 of 16 Old 01-01-2008, 03:18 PM
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I would find out from Skyjacker if they came in the kit and If they did ask the installer what happened to them.
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post #5 of 16 Old 01-01-2008, 03:38 PM Thread Starter
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exactly my thoughts. That's messed up if they didn't put them in, and then I have to go back and BUY shims.

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post #6 of 16 Old 01-01-2008, 03:48 PM
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I have the pro comp shims..they were actually a nice piece..I played grab *** with mine for a while till I got it good.

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post #7 of 16 Old 01-01-2008, 04:24 PM Thread Starter
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yeah, I like procomps carrier shim kit. I'm starting to wonder how much angle the blocks in the lift kit have... wonder if I could turn them around to help point the pinion down rather than up... it's a thought... and it'd be free.

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post #8 of 16 Old 01-01-2008, 06:33 PM
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so what kind of vibe were you getting? also, do you get a very noticeable hum or drone at higher speeds with the angles not right?? i think whoever did my lift messed mine up, cause at 70 MPH i get this extremely irritating drone in the truck. not under any acceleration, its only when i am cruising at a constant 70 to 75, i can also feel a vibe in the truck that matcheds the drone. any help is appreciated. not trying to hijack!!! also, can you post pics of what you are shimming so i have an idea of what i need to do to mine. thanks!


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post #9 of 16 Old 01-02-2008, 05:42 PM Thread Starter
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driveline angles can do all sorts of wierd things. on my 4runner I had all jacked up when the angles were off, it droned at 70-80mph. with driveline geometry it's just that, geometry. Not some Willard just guessing and trying shims at your local "4x4 shop". It's either right, or wrong. with the 2pc shaft... treat it like a 1 pc. 1st, make sure your Tcase & pinion angles are correct. then shim the center carrier to get the 2pc shaft as close to straight as possible. 0-0.5 degrees is good. Pinion angle is supposed to be 1-2* lower than the Tcase, b/c under load it thrusts upward a tad on leaf springs.

One thing I've been thinking about today... I don't feel comfortable running factory blocks, 3.5" blocks, and shims. to much for me. I'm going to try turning the blocks around; the tall side to the front vs the current/typical setup of tall end toward rear. If that doesn't correct my angles... I'm going to ditch the lift (don't want to spend $ on new leafs, and the overload issue), go back to stock, shim the carrier and rear axle to PERFECTION and call it a day. Blocks & vibrations... hate them both. I loved my old 4runner setup. Completely built in the driveway, and could do 100mph smooth.

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post #10 of 16 Old 01-02-2008, 05:54 PM
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one of are work trucks that we lifted like6-7 inchs keeps wearing out universal joints, then the driveshaft falls out, so right now we have the worlds first front wheel drive only f250



On vacation from a truck for a year or...
Looking at 6.4s Moving in a few months then hopefully buying my dream truck!!!

Driving an Audi till then...
but at work I drive
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7 Duramaxes
1 GMC Kodiak Ambulance

NO CUMMINS.....
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