I put LT265/75r16 on my 70, (drum brakes) and they looked like they would just fit. I had a problem with backspacing and they rubbed on the tie rod ends. the 265's measure out to be about 31 in tires. I had to order longer wheel studs, and put a sapcer in to gain the clearance from the susp. they may have fit with different wheels but I had these take offs from my '98 K15.
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1970 GMC K15 - Canadian built
2nd Owner truck 68k miles

2014 Denali 1500 6.2L
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