bad vibrations after ujoint changes

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Nov 7, 2011 | 10:53 PM

fishindave11

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From: Calaveras County

bad vibrations after ujoint changes

Working on a 79 F250 super cab 4x4 Dana 60s front and rear, 400 v8, c6 auto and np205

So last weekend I replaced the u-joints in the front axle and the u-joint in the rear drive shaft at the rear end yoke. Obviously on the freeway I'm not in 4x4 so the front axle wouldn't be causing vibration... the rear u-joint was in bad shape when I swapped it but the vibration is still there on the freeway.

What is the deal with the carrier bearing on super cab rear drive shafts?? I thought those were for 2wd trucks?? Could that be a source of bad vibes?

Nov 7, 2011 | 11:39 PM

Rogue_Wulff

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From: Lost

If you have a carrier bearing, that means it has a slip yoke. If the three u-joints are not aligned perfectly with each other, it's gonna vibrate. Make sure the rear half is clocked in sync with the front half.

Nov 8, 2011 | 10:08 AM

fishindave11

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From: Calaveras County

Ohhhh boy! I will have to check that out! thanks

Nov 9, 2011 | 09:02 AM

lance65

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From: nunya

...and if they are not aligned correctly and you drive it like that for a while(short while) you can break your transmission case....ASK ME HOW I KNOW!

Nov 9, 2011 | 09:32 AM

RWENUTS

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From: Nanaimo BC

If you didn't have a vibration before the u-joint change out just unbolt it and turn the shaft 180 degrees and bolt it back on. That's what I did on mine.
Here's a link on driveshaft phasing.
http://www.fordification.com/forum/v...22a6168f191011

Nov 9, 2011 | 10:32 AM

hairyboxnoogle

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If you put the new u-joint back in the same as the old one came out, (assuming the old one was right) All the grease zerks should line up

Nov 9, 2011 | 01:27 PM

fishindave11

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From: Calaveras County

can I run this truck with a new drive shaft that eliminates the center bearing and slip yoke? Why is it there? I just got done with a slip yoke elimination kit on my jeep...ugh!