CHEVY/GMC/HUMMER YEAR. BOLT PATTERN LUG NUT SIZE QTY MIN. RIM SIZE Lug Kit: ¾ & 1 Ton C20 C30 2WD Pickup/Suburban 2WD 1965-1987 8x6.5 9/16 32 16 PXA26195
1970 used the 3" wider rear end, 5 on 5 pattern, and still used trailing arms. This is the rear end of choice to change to 5 on 5 pattern and move the wheels outward, like the front. If you want to convert to disc and keep your 6 bolt pattern, 1969 is the year to find. 69 had 6 bolt with disc from the factory.