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Bolt size?

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Old Aug 24, 2006 | 05:55 PM
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lexluthr69
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Bolt size?

Does anyone know the size of the bolt used to connect the C/V joint on the rear driveshaft to the yoke? I've tried both M8x1.25 and 5/16-18 and although the M8 bolt seems to fit better, after about 4 threads it seems to get really tight, and I don't want to force it. Those are definately not the bolt holes I want to have weak threads on... or stripped for that matter! The 5/16 bolt only gets about 1-1.5 threads before it snags.
 
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Old Aug 24, 2006 | 06:04 PM
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go to ford dealer and get them.
 
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Old Aug 24, 2006 | 06:19 PM
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lexluthr69
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Are they that unique?
 
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Old Aug 24, 2006 | 06:37 PM
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nope, but they would know what size they are.
 
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Old Aug 24, 2006 | 09:33 PM
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Originally Posted by lexluthr69
Does anyone know the size of the bolt used to connect the C/V joint on the rear driveshaft to the yoke? I've tried both M8x1.25 and 5/16-18 and although the M8 bolt seems to fit better, after about 4 threads it seems to get really tight, and I don't want to force it. Those are definately not the bolt holes I want to have weak threads on... or stripped for that matter! The 5/16 bolt only gets about 1-1.5 threads before it snags.
Are you sure the threads didn't get buggered by rust or dirt when you took the original bolts out? Or did you take them out? Take one of the old bolts, and go to a parts house. Most of 'em have a way to check the thread sizes, and will probably have exactly the bolts you're looking for. In addition, they'll probably have a tap you can use to chase the threads. Be careful here, though. Sometimes, the threads are intentionally misshapen for an interference fit to provide a locking feature. This is particularly useful on things that spin as fast as driveshafts. Look closely at the yoke, and see if it looks like there's any kind of divots or punch marks that look like they were intentionally put there. If so, there's your answer to the tight threads. I doubt very seriously if Ford created a bolt of their own design with an irregular thread. Sometimes they may use a deformed bolt for the interference too, but these too are not unique to Ford.
 

Last edited by Old_Paint; Aug 24, 2006 at 10:06 PM.
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Old Aug 29, 2006 | 04:22 PM
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From: Newport News USA
Thanks for the infor Old_Paint. The driveshaft is an aftermarket piece, but I finally found the bolt. It's a 5/16-24NF. I got both 1.5 and 1.25" just to be on the safe side.

Thanks again for the advice from both of ya'll.

Luke
 
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