GM 1965 1966 1967 1968 1969 1970 1971 Beefed Up 8.875 Inch Limited Slip Posi Differential With 12 Bolt 30 Spline 3.07 3.90 Gear Ratios 19554 010 12BT373 For Classic GM Cars

Beefed Up 8.875in GM Posi Diff: 12-Bolt 30-Spline, Single
✔️ 3.07-3.90 gear ratios, 30-spline output, 12-bolt final diff

Classic GM rear-axle differential for 1965-1971 models with an 8.875 in ring gear. It replaces worn gear sets, improving traction and stability on daily drivers and weekend cruisers.

✅ 8.875 inch ring gear, 12-bolt final gear differential
✅ 30-spline output for durable engagement
✅ Fits 1965-1971 GM carrier series 3 cars with 8.875 inch gear
✅ Gear ratio options from 3.07 to 3.90 (3.08, 3.31, 3.42, 3.55, 3.73, 3.90)
✅ 1-year warranty and included install hardware

💡 What is an 8.875 inch GM Posi Differential used for in classic car builds? A handy upgrade that improves traction and driving feel for rear-drive classics. - It fits 1965-1971 GM models with an 8.875 in ring gear - It supports gear ratios from 3.07 to 3.90 for highway and performance - It replaces worn 12-bolt final gear assemblies to restore drive response - It uses a 30-spline output for durable engagement

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