Yukon Steel Full Spool (GM 12-Bolt Truck - 30 Spline, 3.73 & Up) - YP FSGM12T-4-30
Maximize your traction and power delivery for heavy-duty off-road or track use with the Yukon Steel Full Spool (YP FSGM12T-4-30). Engineered specifically for 1963–1986 GM 12-bolt truck differential housings paired with 30-spline axles and gear ratios of 3.73 and numerically higher (including Chevrolet C10, K10, K5 Blazer, and GMC C1500 / K1500 models), this heavy-duty full spool locks both wheels together for 100% positive traction at all times.
Yukon spools are forged and machined from high-strength steel to handle large tires and high-horsepower applications reliably.
Features
- Designed for GM 12-bolt truck differential housings with 30-spline axle shafts
- Fits gear ratios of 3.73 and numerically higher (3.73, 4.10, 4.56, etc.)
- Provides 100% full-time lockup and positive traction to both rear wheels
- Forged from high-strength steel for superior durability under heavy loads, large tires, and high horsepower
- Ideal for off-road, drag racing, and competition use (Not recommended for street-driven vehicles)
- Backed by Yukon’s industry-leading reputation and quality standards
Specifications
- SKU / Part Number: YP FSGM12T-4-30
- Manufacturer: Yukon Gear and Axle
- UPC Code: 883584321903
- Proxy Number: 32190
- Differential Type: GM 12-Bolt Truck Rear
- Axle Spline Count: 30 Spline
- Supported Gear Ratios: 3.73 and Up
- Material: High-Strength Forged Steel
- Shipping Dimensions: 8.00 in. (Length) x 8.00 in. (Width) x 7.00 in. (Depth)
- Shipping Weight: 10.00 lbs
- California Residents: Prop 65 Warning
What's in the Box
- Yukon Steel Full Spool (30-Spline)
Fitment
Chevrolet:
- 1963–1974 Chevrolet C10 Pickup (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1986 Chevrolet C10 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1963–1974 Chevrolet K10 Pickup (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1986 Chevrolet K10 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1967–1974 Chevrolet K10 Suburban (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1986 Chevrolet K10 Suburban 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1969–1974 Chevrolet Blazer (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 Chevrolet Blazer 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1986 Chevrolet K5 Blazer 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 Chevrolet R10 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 Chevrolet V10 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 Chevrolet V10 Suburban 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1963–1966 Chevrolet Suburban (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1967–1974 Chevrolet G10 Van (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1981 Chevrolet G10 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
GMC:
- 1967–1974 GMC C15 / C1500 Pickup (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1978 GMC C15 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1979–1986 GMC C1500 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1967–1974 GMC C15 / C1500 Suburban (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1978 GMC C15 Suburban RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1979–1986 GMC C1500 Suburban RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1966–1974 GMC K15 / K1500 Pickup (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1975–1978 GMC K15 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1979–1986 GMC K1500 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1967–1974 GMC K15 / K1500 Suburban (w/ GM 12-Bolt Truck, 30 spline, 3.73 & Up)
- 1975–1978 GMC K15 Suburban 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1979–1985 GMC K1500 Suburban 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 GMC R1500 RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 GMC R1500 Suburban RWD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 GMC V1500 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1987 GMC V1500 Suburban 4WD (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1963–1966 GMC Suburban (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
- 1964–1987 GMC G1500 / G15 / G2500 / G25 (w/ GM 12-Bolt Truck, 30 Spline, 3.73 & Up)
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
