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Re: 6 lug to 5 lug rear axle swap
I was wondering this a while back and if memory serves me correctly(don't quote me) #1 the reason they say you need side gears is because early models ran 17 spline spider gears and #2 I believe the 71-2 axles (5lug) are wider than the 64-5-6 model rears. I know also 68-69 gmc axles are wider than 64-5-6. You might check on the "70" 5 lug axles I didn't know they had them that year.
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