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Old 10-27-2011, 02:10 PM
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Drive shaft falling off

I have a 4in lift on my 04 F350 with stock drive shaft and when pushing on brakes too hard the drive shaft falls off. Last time it blew apart my u-joint. I know its like a triangle where if you change the height and the length stays the same the hypotenuse has to get longer. That would be the drive shaft. That would mean that I would need a longer shaft. Has anyone ever had a problem like this? And where or who is good for drive shafts if I need a longer one? Any help would be great. Its a daily driver so need to fix asap!
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Old 10-27-2011, 05:40 PM
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With the truck sitting go underneath and measure how much the slip yoke sits outside the trans before it starts going to the housing for the U joint. I go for 2 finger widths of yoke sitting outside of the case.

A cheap place for shafts is Muscle Motorsports. com (all one word) They have used nascar shafts for 50 bucks that come with the beefy spicer 1350 joints. They have variousl lengths but cant remember offhand what they have.

You will just need to get a custom U joint cross for your app. Basically take the U joint if you get a shaft there and take your stockers in and have them cross them both to get a new U joint.

I would call and ask them the PN of the U joint they use then take your stock FMC part number and make sure you can get a custom ahead of time though.

Another alternative if you have a machine shop is to make a spacer for the pinion flange and get some bigger bolts if you only need a lil bit. But if its falling out like that you need a decent amount more.
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Old 10-27-2011, 06:27 PM
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I've never heard of anyone needing a longer shaft with a 4" lift. I'm wondering if something else might be wrong. maybe the u-joint was just ready to go?
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Old 10-28-2011, 04:18 AM
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Quote:
Originally Posted by atvrider93 View Post
I've never heard of anyone needing a longer shaft with a 4" lift. I'm wondering if something else might be wrong. maybe the u-joint was just ready to go?
Likewise, I've heard it happening with 6"+ lifts but never something as minor as a 4". I know some people need to lower their carrier bearing after installing a lift so maybe that coule be contributing as well?
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Old 10-28-2011, 06:11 AM
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I did shim the carrier bearing 0.5in and the u-joint wasnt bad when it slipped back the yoke caught on the first drive shaft locking the rear end up snapping the u-joint. I am to afraid to hit the breaks too hard and have it happen again cause its a really bad feeling. I have to start breaking far back and slowly. Should I shim the bearing more then 0.5in or would that put too much stress on the front u-joint?
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Old 10-28-2011, 08:17 AM
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Take a picture of the drive shaft mounted. There should be a nice even angle the whole length of the drive shaft that will tell you if you need more shim or not.
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Old 10-28-2011, 08:48 AM
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Mines only an extended cab but I have a 4" lift and no kind of problem. Never heard of a driveshaft problem with 4"
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