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What is the difference between a drum and rotor spindle on a 1974 if any?

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Bob
 

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At the top of the spindle there is a large bolt that the springs from the shoes attaches to and the top of the shoes rest against, it also holds the backing plate. The tab that this large bolt/pin threads into, of the spindle, sticks out about a 1/2" more with drums, then a disc brake spindle. I've had 2 machined down to accommodate the backing plate and rotors, so even though they're different they maybe modified for use with discs.
 
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