Re: 1978 GMC CrossMember in 1960 Chevrolet Apache
78 should still be the 1-1/4" rotor, so you should be able to pick up a set of aftermarket 6 lug rotors and use everything else that's still in good condition from the 78. Measure your thickness before you order the new rotors though because if someone had already swapped out the front end with an 80s 1" rotor setup, you won't be able to use the aftermarket 6 lug rotor.
There wasn't a stock 6 lug, 2wd rotor for these trucks. 1/2 ton went 5 lug with the switch to rotors in 71, but the 4x4 stayed 6 lug
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Christian Carpenter
1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit
1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed
1995 Dodge Dakota Sport
"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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