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Old 12-22-2002, 09:34 AM
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Post u-joint wearing every week!!

I know its not a hot rod, but this is really getting annoying. I have a 1994 Ford F-250 extended cab 4x4 pickup truck with the 351ci engine. Every week I have to replace the universal joint. The end caps on the universal joint that are bolted by u bolts to the yoke on the rear end keep breaking. Everything else is fine. Its only those two end caps. The drive shaft doesn't vibrate so I don't think its out of balance. The pinion angle doesn't look out of wack. I don't understand why it keeps breaking. the truck isn't used hard. I grease the universal joints well. What could it be?
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Old 12-22-2002, 10:22 AM
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Wrong u-joint, some joints have two different size cap diameters to allow it to bolt to the pinion yoke, check yours for fit before you install the u-joint in the driveshaft.

Also how much torque are you tightening them too?
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Old 12-22-2002, 01:01 PM
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My brother had the same problem on his lifted Bronco II. He had to grease them twice a month or they would go out. He got tired of it and changed them to 1330s.
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Old 12-22-2002, 01:48 PM
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I had a similiar problem on my nova when it had a four speed manual. Spicer u joints w/lifetime warranty, napa was getting upset with me for bringing so many back. The caps would get hairline cracks in them and the needle bearings would break.
I replaced the u-bolts with moroso u-joint girdles, they are aluminum parts that replace the u-bolt, it gives the cap more area around it to strengthen it, these solved my problem.
Here they are for your application (if you have a 9")
http://store.summitracing.com/partdetail.asp?part=23353

[ December 22, 2002: Message edited by: Jason ]</p>
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Old 12-22-2002, 06:07 PM
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Does the truck have a suspension lift? If so your drive shaft angles may me too much for the u-joints. If I am correct they can only withstand less than 5 degrees.

Cory
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Old 12-22-2002, 06:54 PM
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Did it do it before you changed the first u joint? If so you have to remember/check the torque on the u joint nuts. That is one of the major u joint failure items. I mostly do chevs but I think the torque for those u joints would be no more than 20 ft pounds. If you are lifted then you have whole nother set of issues.

Rob
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Old 12-23-2002, 08:16 AM
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The truck is not lifted and it didn't have any problems before. Im thinking that it might be me tightening the u-bolts too much. I haven't been using a torque wrench on them, I just tighten them by hand. Ill try backing off a little. Those moroso u-jount girdles sound like a good investment. Hopefully this will solve the problem. Thanx for all the help.
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Old 12-24-2002, 10:44 PM
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There is a reason that manufactures spend millions on engineering. The U-joint cap bolts have a torque specification. Find out what it is for your vehicle and torque them correctly. A driveline or U-joint failure can cause serious damage or injury!
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Old 12-25-2002, 03:01 AM
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Is the slip yoke free? is the rear end still centered on the springs? Does the truck run straight down the road?
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Old 12-25-2002, 03:05 PM
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Everything is straight. Ill look up the torque specs. Thanx
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Old 12-25-2002, 03:10 PM
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Sorry, i was on shagginwagonvic, thats my buddies screen name, I ment to say that. <img src="graemlins/boxing.gif" border="0" alt="[boxing]" />
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