GM 14-Bolt Steel Spool - 10.5" Axle, 4.10 & Down, 40 Spline
YPFSGM14T-3-40
This Yukon GM 14-Bolt 40 Spline Spool is built from high quality steel to deliver maximum strength and durability in extreme off-road and competition use. This GM 14-Bolt Steel Spool replaces the factory differential, locking both rear wheels together for full-time traction. Ideal for trail rigs, mud trucks, and rock bouncers running 10.5" 14-Bolt axles.
Includes:
- (1) Yukon 14-Bolt 40-Spline Steel Spool
Specifications
| Specification | Detail |
|---|---|
| Brand | Yukon Gear & Axle |
| Material | Steel |
| Axle Type | GM 10.5" 14-Bolt Truck |
| Spline Count | 40 Spline |
| Gear Ratio Compatibility |
4.10-and-down gear ratio |
| Traction Type | Full Spool (Locked 100%) |
| Recommended Use |
Off-Road / Competition Only |
Fitment
| Year | Make | Model |
|---|---|---|
| 1973 – 2020 | Chevrolet | C20 / C30 / K20 / K30 / Silverado 2500 / Silverado 3500 |
| 1973 – 2020 | GMC | C25 / C35 / K25 / K35 / Sierra 2500 / Sierra 3500 |
| 1975 – 1993 | Chevrolet / GMC | Suburban 2500 / 3500 |
| 1975 – 1993 | Chevrolet / GMC | Van G30 / G35 |
| 1973 – 1991 | Chevrolet | Blazer / K5 (with 14 Bolt Rear Swap) |
Tech Insight
This spool completely replaces the stock differential carrier, locking both axles together so they spin at the same speed. This design eliminates wheel slip and ensures consistent traction under extreme load and is ideal for off-road rock crawlers, drag racing, and mud trucks. However, because it prevents differential action, it causes tire scrub and driveline stress on pavement, making it unsuitable for street use.
- Provides 100% traction to both rear wheels at all times
- Precision machined steel construction for maximum strength
- Designed for performance and off-road applications
- Not recommended for street-driven vehicles