1974 OLDSMOBILE CUTLASS Differential & Rear-End Components

Differential, Eaton Detroit Locker, 28-Spline, GM, 8.5 in., 3-Series, Each

Part Number: ETN-187C149A

Not Yet Reviewed

Estimated Ship Date: Monday 12/8/2025

• Free Shipping

Differential Carrier Bearing, Steel, Each

Part Number: NTL-LM501349

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 12/8/2025

Differential Carrier Cases, Extreme Heavy Duty, GM 8.5 in., 28/30 Spline, 2.73 and Up Ratio, Each

Part Number: YGA-20084

Not Yet Reviewed

Estimated Ship Date: Jan 7, 2026 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Spacer, Replacement, Active Spacer, Each

Part Number: PWT-624004SDG2

Not Yet Reviewed

Estimated Ship Date: Dec 26, 2025 if ordered today

• Drop Ship
• Special Order

Differential Ring Gear Spacer, Ring Gear Spacer

Part Number: MGR-085050C

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

• Drop Ship
• Special Order

Differential Cover Bolt, Steel, Black, Hex Head, 0.500 in. Wrench Size, Dana 25, 27, 30, 44, Model 35, GM 7.5 in., GM 8.2 in., Each

Part Number: YGA-33286

Not Yet Reviewed

Estimated Ship Date: Monday 12/8/2025

RING GEAR BOLT EACH

Part Number: MGR-PB179-2-L

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

• Drop Ship
• Special Order

Crush Sleeve, Steel, 0.625 in. Tall, Each

Part Number: YGA-33110

Not Yet Reviewed

Estimated Ship Date: Monday 12/8/2025

Differential, Grip Pro Traction System, 28-Spline, GM 8.5 in., Each

Part Number: PWT-GT201028

Not Yet Reviewed

Estimated Ship Date: Dec 26, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order
• Mfr. Rebate

$40.00 Mail-In Rebate

Price after Manufacturer Rebate: $643.43

Rebate Expires: 12/31/2025

Get $40 back after rebate on this Powertrax Product! Go to https://www.richmondgear.com/rebate.pdf for details. ...Read More

Get UP TO $55 back after rebate on select Powertrax Products! Go to https://www.richmondgear.com/rebate.pdf for details. Valid on purchases made between 11/1/25 and 12/31/25. Claims must be submitted within 30 days of purchase. Allow 6-8 weeks for processing. Valid in USA and Canada. Limit two qualifying purchases per household or address. This offer cannot be combined with other discounts or offers. Rebate intended for end consumer only. Show Less

×

Spool, Full Size, Steel, 30-Spline, 10-Bolt, GM 8.5 in., Each

Part Number: RMG-81-1030-1

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Cross Shaft Pin, Mini Spool, GM, 8.5 in., 28-Spline, Each

Part Number: RMG-CSPGM85

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Monday 12/8/2025

USA Standard Gear standard spider gear set for GM 8.5", 30 spline

Part Number: SPZ-39027

Not Yet Reviewed

Estimated Ship Date: Dec 23, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Ring and Pinion Gears and Installation Kit, 8.5" GM 3.42 REAR R&P GEAR/ INSTALL KIT PACKAGE with AK 1563 AXLE BRGS (2.25" OD)

Part Number: YGA-12621

Not Yet Reviewed

Estimated Ship Date: Jan 7, 2026 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Ring and Pinion Gears, 3.08:1 Ratio, 30-spline, Standard Rotation, GM 8.5/8.6 in., Set

Part Number: YGA-24492

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 7, 2026 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Ring Gear Spacer, 0.200 in. Thick, 10-bolt, GM 8.5 in., Each

Part Number: MGR-085050

4.5 out of 5 stars ( 6 )

Estimated Ship Date: Monday 12/8/2025

Cross Shaft, Differential, Steel, GM 8.5 in., with Mini-Spool, Each

Part Number: YGA-32238

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

• Drop Ship
• Special Order

8.5" GM PINION KIT, KOYO BRGS

Part Number: SPZ-60012

Not Yet Reviewed

Estimated Ship Date: Dec 23, 2025 if ordered today

• Drop Ship
• Special Order

Ring and Pinion Gear Installation Kit, Minimum Installation Kit, 30 Spline, GM 8.5 in., Kit

Part Number: YGA-12055

2.5 out of 5 stars ( 2 )

Estimated Ship Date: Jan 7, 2026 if ordered today

• Drop Ship
• Special Order

Ring and Pinion Gear, 3.90:1 Ratio, GM, 8.5 in./8.6 in., Rear, Set

Part Number: SPZ-36215

Not Yet Reviewed

Estimated Ship Date: Dec 23, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: MGR-R10RTPK

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

• Drop Ship
• Special Order

Ring and Pinion Gear, 4.88:1 Ratio, GM, 8.5 in./8.6 in., Rear, Set

Part Number: SPZ-36219

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Dec 23, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Ring and Pinion Gear, 5.13:1 Ratio, GM, 8.5 in./8.6 in., Rear, Set

Part Number: SPZ-36220

Not Yet Reviewed

Estimated Ship Date: Dec 23, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Gear, Ring and Pinion, 5.13:1 Ratio, GM, 8.5/8.6 in., Set

Part Number: MGR-G885513

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/8/2025

• Free Shipping

Ring & Pinion Gear Set GM 10 Bolt 8.5" / 3.42 Ratio

Part Number: SVL-2020642

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Pinion Shaft, CROSS PIN-GM 10 BOLT 8.5" - 93

Part Number: RMG-XL-5640

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

• Drop Ship
• Special Order