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B. W. · 10-08-2018, 10:15 PM

Both sides use the same joint. 371 is the correct part number. The outside edge of the cap should have a slight chamfer on it. This allows it to clear the hole in the knuckle. I have had to relieve some knuckles when using cheap joints without the chamfer on some rigs - not GM specific. If there is a lot of rust or scale on the center bore that could be an issue too.

10-08-2018, 10:15 PM	#2
B. W. Registered User Join Date: Nov 2014 Location: Bigfork, Montana Posts: 1,137	Re: 77 K10 U joints? Both sides use the same joint. 371 is the correct part number. The outside edge of the cap should have a slight chamfer on it. This allows it to clear the hole in the knuckle. I have had to relieve some knuckles when using cheap joints without the chamfer on some rigs - not GM specific. If there is a lot of rust or scale on the center bore that could be an issue too.