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Re: 1972 "260" ujoint -to- 1977 "297" ujoint upgrade ?
It is the back side of the spindle that is different where the outer stub seals. So an upgrade would be in order anyways. They will fit, but the newer stub has a rubber V seal that could become damaged on the older spindle. AND with the 77 spindle comes a larger inner bearing. So with that comes the hubs. Not a big deal it all bolts together and you n=have to take it down that far anyways. Knuckles nope, unless the ball joints are loose. 72 has what they call a 'flat top knuckle that can be machined if you want to go to cross-over steering and it also has a top taper tie rod end hole where as the 77 tie rod comes into the knuckle from the bottom. Either than that, the spindle and everything else will bolt up without issues
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