1978 PONTIAC FIREBIRD Differential & Rear-End Components

Axle Shaft, Direct Fit, 1541H Alloy Steel, 28-Spline, 30.125 in. Length, Chevy, Pontiac, Each

Part Number: MGR-MG27122

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Estimated Ship Date: Nov 26, 2025 if ordered today

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Performance Mini Spool (GM 8.5 - 28 Spline)

Part Number: SDH-10015373

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Estimated Ship Date: Dec 8, 2025 if ordered today

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Differential Carrier Gear Kit

Part Number: RMG-XL-4048

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Estimated Ship Date: Nov 26, 2025 if ordered today

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Differential Ring Gear Spacer, Ring Gear Spacer

Part Number: MGR-075050C

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SLOTTED DRIVER

Part Number: PWT-424003DGE2

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COUPLER

Part Number: PWT-5201004CJY

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Spring, SPRING,COMPRSN, .25D,250 LB/IN

Part Number: PWT-8011001ZAT

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Spring, SPRING,COMPRSN,15 LB/IN,IN, NS

Part Number: PWT-8021001ZBG

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Spring, SPRING,COMPRSN, 500 LB/IN,OUTR

Part Number: PWT-8031001ZAV

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SPACER

Part Number: PWT-1920604SAJ

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Gear, Ring and Pinion, 3.42:1 Ratio, GM, 7.5 in./7.625 in., 3 Series, Set

Part Number: MGR-G875342

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Estimated Ship Date: Nov 26, 2025 if ordered today

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Gear, Ring and Pinion, 3.42:1 Ratio, GM, 7.5 in./7.625 in., Set

Part Number: MGR-G875342X

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INTERNAL DRIVE

Part Number: PWT-1930404DGX

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Ring and Pinion Gears, Pro Series, 3.90:1 Ratio, GM, 7.5 in., Set

Part Number: MGR-G975390

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Estimated Ship Date: Nov 26, 2025 if ordered today

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Ring and Pinion Installation Kit, Basic, GM 8.5 in., Front/Rear, Kit

Part Number: MGR-R10RE

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Estimated Ship Date: Nov 25, 2025 if ordered today

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USA Standard Ring & Pinion "thick" gear set for GM 7.5" in a 4.11 ratio

Part Number: SPZ-36200

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Estimated Ship Date: Nov 24, 2025 if ordered today

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USA Standard Ring & Pinion "thick" gear set for GM 7.5" in a 3.73 ratio

Part Number: SPZ-36198

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Ring and Pinion Gears, 4.56:1 Ratio, 27-spline, Standard Ring Gear Rotation, GM 7.5 in., GM 7.625 in., Set

Part Number: SPZ-36201

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Estimated Ship Date: Nov 24, 2025 if ordered today

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8.5" GM 28spl MINI SPOOL

Part Number: SPZ-59011

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Ring and Pinion Gears, 5.38:1 Ratio, 30-spline, Standard Ring Gear Rotation, GM 8.5 in., GM 8.6 in., Set

Part Number: SPZ-36221

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Crosspin, Replacement, Steel, Spartan, GM 8.5 in., Each

Part Number: SPZ-17024

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Gear, Ring and Pinion, 2.73:1, GM, 8.5 in., 8.6 in., Set

Part Number: SPZ-36346

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Estimated Ship Date: Nov 24, 2025 if ordered today

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High performance Yukon Ring & Pinion "thick" gear set for GM 7.5" in a 4.11 ratio

Part Number: YGA-24481

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Estimated Ship Date: Dec 8, 2025 if ordered today

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Posi spring kit for GM 7.5", with preload plates

Part Number: YGA-33206

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Estimated Ship Date: Dec 8, 2025 if ordered today

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Yukon positraction internals for 7.5" and 7.625" GM with 26 spline axles

Part Number: YGA-16116

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Estimated Ship Date: Dec 8, 2025 if ordered today

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