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I doubt you will have a problem. Ford and GM used the same "small" spindle diameter for years regardless of engine size/vehicle weight.
 Chrysler went to the larger spindle not for strength but to fit the larger bearing... The smaller bearings were prone to failure... Cass's bearing spacer allows the big bearing to be used with the small spindle, similar spacers are used in industrial applications without issues every day...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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