GM Corp. 12-Bolt 8.875" - Ring & Pinion

Applications: 1964-82 K10, K20 & Blazer (F/S) rear axles Case Changes: 2.73 only, Low 3.07 - 3.42 and High 3.73 - 4.56

GGGM12-8875-307 3.07 ratios

GGGM12-8875-342 3.42 ratios

GGGM12-8875-373 3.73 ratios

GGGM12-8875-373X 3.73 ratios (thick gears)

GGGM12-8875-410 4.10 ratios

GGGM12-8875-410X 4.10 ratios (thick gears)

GGGM-12-8875-456 4.56 ratios

GGGM12-8875-456X 4.56 ratios (thick gears)