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My 71 had the smaller 260 u-joints in it. I broke both of them at the the same time with a open front diff and bald 33's...30 year old small u-joints suck.

You can swap in the newer shafts if you want.
 

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70 above 73 and up below. You can see how beefier the axles are. They were a little longer than than the old ones too. Is your 71 a disc brake axle? If it is the newer shafts will go right in. Mine was drum brakes. I had to swap the knuckles to get them to fit. I know your question was about u-joints but wanted to show this too. Its a good upgrade.
 

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My brother's '70 K5 had drums with the smaller joints. '71 I would suspect has the smaller joints, could go either way. Its easy to see them and verify which joints they are.

Pete
 

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ChiScouter said:


Just what year had 1310's on the axleshafts:confused: :confused:
Every year. 5-260x and 5-297x are both rated as 1310 series u joints.

If your axle has disc brakes, you can be pretty sure that it has the bigger 297 joints

i believe that spicer has a neww beefy joint to replace the 297
It is Spicer PN 5-760x
 

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reddwarf said:


If your axle has disc brakes, you can be pretty sure that it has the bigger 297 joints



It is Spicer PN 5-760x
Unless it is a '71 axle, in which case it will definitely have 260s and disc brakes.
 
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