Yukon Gear & Axle SK CSJK-R Solid Spacers, Shims & Shim Kits - Durable

Our review of the Yukon Gear & Axle SK CSJK-R kit finds it best suited for mechanics and experienced DIYers working on lower mileage differentials who want a reusable, precise pinion setup. The single biggest reason to buy is that this kit supplies a complete, vehicle specific set of solid spacers and shim kits that let you set pinion depth and preload without replacing carrier bearings or races when those components are still in good condition. It arrives with the parts needed to finish a pinion install cleanly and accurately.

Key Features

• Complete pinion kit: Includes pinion bearings, races and a pinion seal so users have everything required to install the pinion on compatible applications.
• Solid shims and spacer selection: The kit contains a full pinion shim kit and solid spacers that simplify carrier setup and reduce the need for trial-and-error shimming.
• Quality small parts: Comes with pinion nut, thread locker and marking compound with brush to secure and accurately mark gear contact during setup.
• Crush sleeve option: Includes a crush sleeve where applicable so the kit can support applications that prefer sleeve-style preload adjustment.
• Vehicle specific fit: Part number SK CSJK-R is researched for application accuracy, lowering the risk of missing or incorrect pieces for the intended vehicle.
• Reuses serviceable bearings: Designed for lower mileage installs where carrier bearings and races can be reused, saving cost compared with full bearing replacement.

Who It's For

This kit is ideal for technicians and competent home mechanics tackling differential work on vehicles that match the SK CSJK-R application. If the carrier bearings and races are in good condition, the kit lets you replace only what is necessary while achieving precise pinion preload and depth with the included shims and spacers.

Those who should look elsewhere are owners of high-mileage differentials with worn bearings or anyone needing a universal shim set; this is a vehicle specific kit and assumes reusing serviceable bearings and races rather than replacing them all.

Pros & Cons

Pros

• High quality components and accurate fitment make installation straightforward when the vehicle matches the kit.
• The complete small parts package including thread locker and marking compound reduces trips to the parts store.
• Solid shims and interlocking pieces help simplify carrier setup and produce repeatable results.
• Includes crush sleeve where applicable, offering flexibility for different preload methods.

Cons

• Not intended for high-mileage differentials where new carrier bearings and races are required, limiting its use in some rebuilds.
• Some buyers report mixed opinions on thickness consistency and size variety in the shim pack, so fine tuning may be needed.

Specifications

Brand	Yukon Gear & Axle
Part Number	SK CSJK-R
OEM Equivalent	SKCSJKR
Fit Type	Vehicle Specific
Included Items	Pinion bearings, races, pilot bearing (if applicable), crush sleeve (if applicable), shim kit, pinion nut, thread locker, marking compound
Application	Pinion installation on lower mileage differentials where bearings and races can be reused

Our Verdict

The Yukon SK CSJK-R is a practical choice for users who need a vehicle specific pinion kit that focuses on precise shim and spacer selection without forcing a full bearing replacement. It offers good value when carrier bearings and races are serviceable and the included small parts make a clean install easier, though those rebuilding heavily worn differentials should budget for full bearing and race replacement instead.

Frequently Asked Questions

Does this kit include a crush sleeve?
Yes, a crush sleeve is included where applicable to the specific vehicle application.

Can I reuse my carrier bearings with this kit?
Yes, the kit is intended for lower mileage installs where carrier bearings and races can be reused.

Is the shim thickness consistent?
Most users report good functionality, but some note mixed opinions on thickness consistency and size variety, so expect to verify fit during setup.