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post #1 of 7 Old 02-28-2008, 06:41 PM Thread Starter
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driveline question

replaced the 2 u joints at my rear driveshaft. one went bad and once i fixed it and it was tight it threw out the other going weak. i now, 3 months later am feeling a shudder under load during take off on turns....any ideas?? thank you!

late 99 f250 7.3L 265k
4" lift, dual front shocks, adjustable air bags added to rear.
new calipers, brakes and rotors all around
isspro guages
rebuilt tranny with heavy clutches and shift kit. billet cowan converter.
finned front and rear diff. covers.
rhino liner bottom strips
cattle front bumper with 2" receiver, black steel rear bumper. 315/75/16 AT
diy intake
4" straight pipe
wastegate delete
ccv mod
foil delete
zoodad mod
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post #2 of 7 Old 02-28-2008, 06:45 PM
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have the shaft balanced, had the same issue in a Dmax at work and just kept replacing them and then i said wait lets get it balanced and havent had a prob since

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post #3 of 7 Old 02-28-2008, 06:53 PM Thread Starter
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i will look into that, thank you. but the u joints were sloppy and bad. what makes the shaft become unbalanced? thank you

late 99 f250 7.3L 265k
4" lift, dual front shocks, adjustable air bags added to rear.
new calipers, brakes and rotors all around
isspro guages
rebuilt tranny with heavy clutches and shift kit. billet cowan converter.
finned front and rear diff. covers.
rhino liner bottom strips
cattle front bumper with 2" receiver, black steel rear bumper. 315/75/16 AT
diy intake
4" straight pipe
wastegate delete
ccv mod
foil delete
zoodad mod
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post #4 of 7 Old 02-28-2008, 08:09 PM
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it could get bent or a wieght falls off i would guess just my :2cents:

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post #5 of 7 Old 02-29-2008, 02:42 AM
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the shafts are balanced with the factory u-joints, now you changed the u-joints and there may be a possibility that you created an out of balance condition. i see you also have a lift, that can cause a shudder on takeoff too. i get it, but it is not that bad.


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post #6 of 7 Old 02-29-2008, 02:45 AM
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Check your center support bearing if you have one. If that is bad it can cause shudder and driveline vibration as well.

Also check the tires have them ballanced as well. Tires out of ballance can cause driveline vibrations.

Check your Driveline angle you may have to shim the center support bearing if you have one. Or you may have to clock the axle to create a better driveline angle.

Last but not least you maybe experincing axle wrap, if this is the case then you will need to get ladder bars for the truck to prevent this.

Another thing to do just to make sure all is good. Check your front end, ball joints and wheel bearings. As if they are bad they can cause driveline vibrations.


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post #7 of 7 Old 02-29-2008, 05:30 PM Thread Starter
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alot good info. i will check it out, thanks guys. could it also be the carrier bearing??

late 99 f250 7.3L 265k
4" lift, dual front shocks, adjustable air bags added to rear.
new calipers, brakes and rotors all around
isspro guages
rebuilt tranny with heavy clutches and shift kit. billet cowan converter.
finned front and rear diff. covers.
rhino liner bottom strips
cattle front bumper with 2" receiver, black steel rear bumper. 315/75/16 AT
diy intake
4" straight pipe
wastegate delete
ccv mod
foil delete
zoodad mod
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