Best 3 73 Rear End Rebuild Kit for Different Axle Types

#1 · Best Overall

1. Yukon Chevy 8.5-Inch 10-Bolt Kit

Best for: Chevy 8.5-Inch 10-Bolt Rebuild.

Why it ranks #1: Combines a 3.73 ring and pinion, 28-spline Yukon Dura-Grip clutch posi, and master bearing/installation kit for a Chevy 8.5-inch 10-bolt.

The 28-spline Yukon Dura-Grip clutch posi makes this package specific to Chevy 8.5-inch 10-bolt rearends, with a 3.73 ring-and-pinion set alongside it. A matching master bearing/installation kit adds rebuild components, giving owners of the stated housing a combined option for differential, gearing, and bearing work.

This package is listed for the Chevy 8.5-inch 10-bolt, 28-spline application, so those dimensions are central to selecting it over kits for different housings. The Dura-Grip clutch posi and 3.73 ring-and-pinion address differential and ratio changes together. Its master bearing/installation kit adds support for the bearing portion of the rebuild, consolidating the specified major components in one package.

Skip it if you need a 7.5-inch or 7.625-inch Chevy 10-bolt package; Yukon Charlie's listing specifies those smaller housings.

This fits the stated needs of a Chevy 8.5-inch, 28-spline 10-bolt rebuild with a clutch posi and 3.73 gears. Treat the housing and spline specifications as the fit boundary.

Listed on Amazon as: GM Chevy 8.5" Chevy 10-Bolt Rearend Posi – 28 Spline, Gear, Bearing Kit Package – 3.73 Ratio

#2 · Best Truck 12-Bolt

2. Chevy 12-Bolt Truck Kit

• Warranty Description: 1 Year Warranty on All Parts

Best for: Chevy 12-Bolt Truck Rebuild.

Why it ranks #2: Includes a 3.73 ring and pinion, 30-spline Eaton clutch posi, and master bearing kit; it specifies truck C-clip applications only.

An Eaton 30-spline clutch posi distinguishes this 3.73 Chevy 12-bolt truck package, combining limited-slip differential hardware with matching ring-and-pinion gears. The included master bearing/installation kit serves buyers rebuilding the rearend as a package, while the listing's truck-only fit specification rules out Chevy 12-bolt car applications.

The stated application is Chevy 12-bolt TRUCK rearends with C-clip configuration, a useful boundary when sorting parts for a rebuild. Eaton's 30-spline clutch posi is paired with a 3.73 ring-and-pinion set, so both differential and gearing components are included. A master bearing/installation kit completes the listed package. The product explicitly will not fit 12-bolt car rearends, making housing type the decisive compatibility check.

Skip it if you need parts for a Chevy 12-bolt car rearend; this package is specified for truck housings only.

This suits a C-clip Chevy 12-bolt truck owner replacing the posi, gears, and bearings in one package. Keep its truck-only application in mind; it is not the car-rearend version.

Listed on Amazon as: GM Chevy 8.875" 12-Bolt TRUCK Rearend Posi – 30 Spline, Gear, Bearing Kit Package – 3.73 Ratio

#3 · Best Car 12-Bolt

3. Chevy 12-Bolt Car Kit

Best for: Chevy 12-Bolt Car Rebuild.

Why it ranks #3: Pairs a 3.73 ring and pinion with a 30-spline Yukon Dura-Grip and installation kit, specifically for car rearends with C-clips.

The 30-spline Yukon Dura-Grip clutch posi is the defining feature of this Chevy 12-bolt car package, pairing limited-slip hardware with a 3.73 ring-and-pinion set. Its master bearing and installation kit rounds out the rebuild components, giving car-rearend owners a coordinated package for an upgrade or rebuild.

This package is specifically for Chevy 12-bolt CAR rearends and C-clip applications, so its stated fit boundary helps separate it from the truck version. The 30-spline Dura-Grip clutch posi and 3.73 gears address differential and ratio replacement together, while the master bearing/installation kit supports the rebuild workflow. The listing explicitly excludes 12-bolt truck rearends; identifying the housing type before ordering is essential to choosing this package.

Skip it if you are rebuilding a Chevy 12-bolt truck rearend; the listing specifically excludes truck applications.

Choose this package for a C-clip Chevy 12-bolt car rearend rebuild needing a 30-spline clutch posi, 3.73 gears, and master kit. Its car-only fit is the key boundary.

Listed on Amazon as: GM Chevy 8.875" 12-Bolt CAR Rearend Posi, Gear, Bearing Kit Package – 3.73 Ratio

#4 · Best 7.5-Inch Package

4. Yukon Chevy 7.5/7.625 Kit

• Weight: 3.7 lb
• Warranty Description: 1 Year Warranty on All Parts

Best for: Compact Chevy 10-Bolt Rebuild.

Why it ranks #4: Supplies a 28-spline Yukon Dura-Grip, 3.73 gears, and master bearing/installation kit for Chevy 7.5- or 7.625-inch 10-bolts.

A Yukon Dura-Grip clutch posi with 28 splines anchors this package for Chevy 7.5-inch or 7.625-inch 10-bolt rearends. It pairs the differential with 3.73 gears and a master bearing/installation kit, giving owners of those specific housings the principal listed components for an upgrade or rebuild.

The 7.5-inch and 7.625-inch application range is explicit, helping buyers distinguish this package from kits for other Chevy 10-bolt sizes. Its 28-spline Dura-Grip clutch posi pairs with a 3.73 ring-and-pinion set, while the master bearing/installation kit supports a combined rebuild workflow. The listing specifies grease as the compatible lubricant, a relevant service detail to account for when planning the differential work.

Skip it if you have a Chevy 8.5-inch 10-bolt; Yukon Gear's 8.5-inch 28-spline package matches that listed housing size.

Choose it for a Chevy 7.5- or 7.625-inch, 28-spline 10-bolt rebuild needing a posi, 3.73 gears, and master kit. The housing size and spline count define its fit.

Listed on Amazon as: GM Chevy 7.5" / 7.625" Chevy 10-Bolt Rearend Posi – 28 Spline, Gear, Bearing Kit Package – 3.73 Ratio

#5

5. maXpeedingrods Chevy 8.5 Kit

• Weight: 46.7 lb

Best for: Chevy 8.5-Inch LSD Rebuild.

Why it ranks #5: Specifies a GM 8.5-inch 28-spline application and includes a 3.73 gear set, multi-plate clutch LSD, bearings, and an oil seal.

A multi-plate, 28-spline clutch-type limited-slip differential leads this GM 8.5-inch 10-bolt package, which also includes 3.73 gears. Its listing specifies differential and angular gear bearings plus an oil seal, giving rebuilders a parts bundle that reaches beyond the gear set and LSD itself.

The 28-spline multi-plate clutch LSD and 3.73 ring-and-pinion are specified for a GM 8.5-inch, 10-bolt application, aligning the package around both traction hardware and gearing. The bearing list names differential bearings LM102949/11 and angular gear bearings M88048/10 and M802048/11; an oil seal is also listed. Those components help define the rebuild scope, though the supplied details do not name every possible installation item.

Skip it if you need a package explicitly listing a master bearing/installation kit; this component list names bearings and a seal instead.

Consider it for a GM 8.5-inch 28-spline 10-bolt rebuild seeking a multi-plate LSD, 3.73 gears, bearings, and seal. Review the listed components against the full scope of your rebuild.

Listed on Amazon as: maXpeedingrods For GM Chevy 8.5" 10-Bolt Posi Rear End Kit 28 Spline 3.73 Gears Bearings GM85PGBK-28-373

#6 · Best 8.625-Inch Match

6. National Drivetrain GM 8.625 Kit

• Weight: 35 lb
• Warranty Description: 1 Year or 50,000 Miles

Best for: GM 8.625-Inch Bearing Rebuild.

Why it ranks #6: Combines 3.73 gears with a Koyo tapered master bearing kit, and lists GM 8.625 fitment plus a 30-spline pinion and 8620 steel gears.

Koyo tapered bearings distinguish this GM 8.625 differential rebuild package, which combines a 3.73 gear set with a rear master bearing kit. Its specifications also identify 8620 steel gears, 30-spline pinion, and a 2.73-and-higher carrier break, offering specific fit details for planning the replacement.

The ring-and-pinion is specified at 3.73 with 41 ring and 11 pinion teeth, and the listing gives an 8.5-inch ring-gear outside diameter plus 30-spline pinion. Koyo tapered bearings are included in the rear master kit for GM 8.625 differentials. The stated 2.73-and-higher carrier break and standard rotation further narrow the gear fit, while the listing names no posi unit.

Skip it if you need a limited-slip unit included; this package lists gears and a rear master bearing kit, not a posi.

Choose it for a GM 8.625 differential rebuild needing 3.73 gears and Koyo tapered bearings, subject to its 30-spline, standard-rotation, and carrier-break specifications. It does not list a posi.

Listed on Amazon as: GM 8.625 3.73 Ring and Pinion Gear Set (GM10-373A) and Rear Master Bearing Rebuild Kit with Koyo Tapered Bearings (R10RLMK) for GM 8.6 Rear Differential

#7

7. USA Standard GM 8.6 Gear Kit

• Weight: 26.6 lb
• Warranty Description: Manufacturer Warranty

Best for: GM 8.6-Inch Gear Rebuild.

Why it ranks #7: Lists a GM 8.6-inch 3.73 ring and pinion with an install kit, axle bearings, and seal; it does not list a posi unit.

The inclusion of axle bearings and a seal alongside an 8.6-inch GM 3.73 ring-and-pinion distinguishes this USA Standard Gear package. The listed components extend the parts scope beyond gears and an install kit, making it a candidate for an 8.6-inch rearend service that also addresses axle-bearing and seal replacement.

The package names an 8.6-inch GM 3.73 rear ring-and-pinion, an install kit, axle bearings, and a seal. That combination can consolidate gear setup and specified axle-end replacement components into one parts order for the listed application. Alloy steel is the stated material, and the package dimensions and weight are provided for handling and storage planning. The supplied information does not identify a posi unit.

Skip it if you want a package that explicitly includes a posi; this listing names gears, install kit, axle bearings, and seal.

Choose this for an 8.6-inch GM rear service needing 3.73 gears, install kit, axle bearings, and a seal. The listed components do not include a specified posi, so plan accordingly.

Listed on Amazon as: 8.6" GM 3.73 Rear Ring & Pinion, Install Kit, Axle Bearings & Seal

#8

8. National Drivetrain GM 7.625 Kit

• Weight: 35 lb

Best for: GM 7.625-Inch Gear Service.

Why it ranks #8: Targets a GM 7.625 10-bolt and includes matched 3.73 ring and pinion gears with a master bearing installation kit, but no posi unit is listed.

A 3.73 matched ring-and-pinion and master bearing installation kit are the listed core components for GM 7.625-inch 10-bolt service. The description identifies pinion and side bearings as kit contents, giving owners a focused option for replacing gears and associated bearings without a stated posi unit.

The title specifies compatibility with GM 7.625 10-bolt applications, while the 3.73 ratio defines the gear replacement target. The master installation kit is described as including complete pinion and side bearings, helping coordinate bearing work with the matched ring-and-pinion installation. The product details do not identify a limited-slip differential, so buyers planning a broader differential rebuild should account for that separate requirement.

Skip it if you need a posi included with the gears; this listing describes a ring-and-pinion and master bearing installation kit.

This suits GM 7.625-inch 10-bolt owners replacing the ring-and-pinion and related bearings at 3.73 ratio. Its stated scope is gear and bearing installation, not a posi upgrade.

Listed on Amazon as: 3.73 RING AND PINION & MASTER BEARING INSTALL KIT – COMPATIBLE WITH GM 7.625 10 BOLT

#9

9. National Drivetrain Dana 60 Kit

• Weight: 35 lb

Best for: Dana 60 Gear-and-Bearing Service.

Why it ranks #9: Provides a 3.73 ring and pinion plus master bearing installation kit for a Dana 60; the listing does not specify a posi differential.

A matched 3.73 ring-and-pinion set paired with a master bearing installation kit is the core of this Dana 60 standard package. Its description says the kit includes the parts required to replace the ring and pinion properly, making it relevant to a gear-and-bearing service rather than a posi upgrade.

The Dana 60 standard designation identifies the listed application, while the matched ring-and-pinion set keeps the gear replacement centered on the specified 3.73 ratio. The master installation kit is described as including complete pinion and side bearings, supporting the bearing work associated with that replacement. No posi unit is identified in the supplied listing, so this package's stated scope is gear-and-bearing service rather than limited-slip differential replacement.

Skip it if you need a limited-slip differential with your gears; this listing describes a ring-and-pinion and bearing installation kit.

This is for a Dana 60 standard gear-and-bearing replacement centered on a matched 3.73 set. It suits buyers handling that service, but the supplied details do not specify a posi differential.

Listed on Amazon as: 3.73 RING AND PINION & MASTER BEARING INSTALL KIT – DANA 60 STANDARD

#10

10. Yukon Ford 8.8-Inch Kit

• Warranty Description: 1 Year Warranty on All Parts

Best for: Ford 8.8-Inch 31-Spline Rebuild.

Why it ranks #10: A complete 3.73 package with a 31-spline Dura-Grip and master installation kit, but it fits Ford 8.8-inch applications rather than GM or Dana axles.

A 31-spline Yukon Dura-Grip clutch posi sets this package apart for Ford 8.8-inch rearends, joined by 3.73 gears and a master bearing/installation kit. For a rebuild requiring all three categories, the bundle brings differential, ratio, and bearing components together under a clearly stated Ford application.

The listing specifies Ford 8.8-inch, 31-spline applications, which makes both housing size and spline count important fit criteria. A Yukon Dura-Grip clutch posi is paired with the 3.73 ring-and-pinion set, while the master bearing/installation kit supports the rebuild workflow. Hypoid gear oil is the stated compatible lubricant, a practical detail for planning service materials alongside the mechanical work.

Skip it if you are rebuilding a Chevy rearend; this package is specified for Ford 8.8-inch, 31-spline applications.

Choose this for a Ford 8.8-inch, 31-spline rebuild that needs a clutch posi, 3.73 gears, and master kit. The Ford housing and spline specification set a firm fit boundary.

Listed on Amazon as: Posi, Ring & Pinion Gear, Bearing Kit Package fits 8.8" Ford Rearend – 31 Spline – 3.73 Ratio