Quote:
Originally Posted by clay68c10
All the 71-72 discs are 1 1/4.
The square body 73-87 HD brakes are 1 1/4.
Tie rod end and ball joint tapers aren't the same between 71/72 and 73+.
Figure out what year range spindles you have now, and go from there.
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Some of the 81-87 trucks had light duty 1" rotors.
These rotors requires different spindles, bearings and calipers.
But I agree,... find what you have now via the balljoints and outer tie rods.
(specifically the upper balljoint or outer tie rods,... since the lower balljoints are the same on 71-72 and 73-87 trucks)