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21 gear ratio good for highway driving
Built for durability and smooth operation
the shaft lengths must change to maintain correct fitment
1971 - 1972 Chevrolet K20 Suburban 1977 - 1986 Chevrolet K30 1971
SPEC grease formula controls heat during high-speed desert or Ultra4 conditions
Yukon GM 8.5" & 8.6" Steel Spool - 30-Spline, 2.73 & Up 1980-chevrolet-k20-esi8508551 21 gear ratio good forThis 30 spline steel spool for GM 8. 5" and 8. 6" rear axles is designed to deliver maximum strength and full time traction in drag racing, mud trucks, and dedicated trail rigs where traction and simplicity are critical.. By replacing the factory differential carrier, it permanently locks both axle shafts together, ensuring equal torque delivery to both wheels under all conditions. Commonly found in GM trucks, SUVs, and performance cars, the 8. 5" and
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