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What size are the driveshaft bolts?

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Old Nov 9, 2008 | 10:13 AM
  #1  
jcsws6's Avatar
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From: San Antonio, TX
What size are the driveshaft bolts?

Guys,
Real quick trying to help a friend finish a project today and there are no junk yards open/around. Does anyone know the size/thread pitch of the four drivshaft bolts at the u-joint? Hoping they are something we can grab at Lowes and be done!

Thanks!!
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Old Nov 9, 2008 | 12:15 PM
  #2  
AlkyIROC's Avatar
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: What size are the driveshaft bolts?

They're special bolts. Usually 5/16" bolts with a 5/16" flanged hex head. Try you local auto parts store.

I thought most of the GM u-joints used straps over the caps?
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Old Nov 9, 2008 | 02:43 PM
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fast82z's Avatar
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From: NE Ohio
Car: 82 Z28
Engine: TT LS
Transmission: 4L80E
Axle/Gears: S60 3.54's
Re: What size are the driveshaft bolts?

I know we stock a few bolt/strap kit sort of deals for that at Autozone.
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Old Nov 9, 2008 | 03:56 PM
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AlkyIROC's Avatar
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: What size are the driveshaft bolts?

Doh! Ya right. Straps AND bolts. Whenever I think of bolts, I picture solid caps over the u-joint caps held on with bolts or u-straps that go through the yoke and are secured with nuts.

Same things goes. A regular bolt won't work however an allen head bolt "may" work since it's head is smaller than a regular bolt.

It's always best to use the proper parts. Just about every auto parts store should carry a GM strap kit.
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