One piece driveshaft???? - Ford Powerstroke Diesel Forum
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  #1  
Old 08-31-2008, 04:56 PM
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One piece driveshaft????

I had my two piece driveshaft replaced with a one piece. I had my truck lifted 6.5" and they could not get the vibration at take off to stop. I was told a one piece driveshaft would fix the problem,so I did it,and this fixed the vibration.Just wanted to know if anybody has had any problems after doing a one piece driveshaft?
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Old 08-31-2008, 06:16 PM
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anyone................. back too the top..............
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Old 08-31-2008, 06:22 PM
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Mine is stock ... but I would like a one piece ... lose less HP !
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Old 09-01-2008, 12:11 AM
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why really do they use 2 piece driveshafts? Life would be so much easier if it was just one, even if it was 9ft long.
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Old 09-01-2008, 12:13 AM
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I am lifted pretty big and I have vibration but it comes from the front. and its not that bad. done a 2000 mile and a 330 mile trip on it without it bugging me... then again its my truck so i dont care. i think the vibration would bother other people alot. I just know that nothing is lose cuz I built it lol
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Old 09-01-2008, 01:36 AM
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is your truck lifted with springs or blocks in the rear??

What you need to look at is the agles of the ujoints on the front and rear of the shaft. If I remember correctly they should be very close to the same angle. you may have to use some wedge shims on the rear axle to get the angles correct and that should get rid of it. I had to do this on an old jeep. lifts are designed around the 2 piece shaft and only correct for those angle and even then some do better then others. but hey this is just my 2 cents.

hope this helps
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Old 09-01-2008, 01:51 AM
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a block and one add-a-leaf in the rear.

where do the shims go? I only used shims once and that was helping someone put new gears in a 89 wrangler. its tough!
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Old 09-01-2008, 02:04 AM
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They would go inbetween the axle and block. If you have a flat block you could look for one that has an agle built into it as well.

Here is a link to the shims Driveline Alignment Shim Kit

and a pic of where they go
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Old 09-01-2008, 02:20 AM
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interesting! i didnt even know those existed.. thanks bud
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Old 09-01-2008, 02:33 AM
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I have a 6.5" lift also. The center carrier bearing was shimmed down at the time of the lift (previous owner) and was not a problem until I added a TW chip. The new HP showed up several weaknesses in the old girl. I found that my carrier bearing was worn - replaced that and still had a little chatter on take off. Made a couple of 3/16" shims yesterday and added them. The additional 3/8" has almost cleared up the problem. I can still feel a little vibration. It may be the U-joints?

My rear shaft is within 1 degree of being the same as the pionion shaft angle. The two shafts are within 2 degrees of each other now. It is hard to determine the angle between the output shaft of the transfer case and shaft.
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