400lb Springs & Forged 4130 Internals Part number: 19557-010,19557010, YDGGM8.5-3-28-1, EAT19557, 998.GM10C, 546018,542018,GM85PGBK-28-373 GM10-LS28 Fitment: Fits all Chevy GM 8.5" 10-Bolt Applicatons w/ 28 Spline Axles Fits 2.73 & Numerically Higher Gear Ratios (3.08, 3.42, 3.73, 4.11, 4.56, etc) 1Other Part Number 19557-010, YDGGM8.5-3-28-1, EAT19557, GM10-LS28; Type Differentials & Parts; Interchange Part Number 19557-010, YDGGM8.5-3-28-1, EAT19557, GM10-LS28, 19557010; OE/OEM Part Number 19557-010; Part Number 19557-010, YDGGM8.5-3-28-1, EAT19557, GM10-LS28, 19557010; Placement on Vehicle Front;