1973-1987 GMC C15 2WD 3"/5" Drop Spindle Kit - 1.25" Rotors + Shocks
GMC-specific listing: This version is cataloged specifically for 1973-1987 GMC C15 2WD squarebody trucks, with GMC-focused fitment, search terms and product navigation for the squarebody C15 platform.
This 3/5 package is built for GMC C15 owners who want the geometry advantages of a purpose-built drop spindle up front and a matched axle-flip solution at the rear.
This is the 1.25-inch rotor spindle version. Measure the front rotor thickness before ordering; the 1.00-inch and 1.25-inch spindle versions are different applications and should not be substituted for one another. This version includes matched drop shocks for both ends, reducing the number of separate suspension pieces needed to finish the lowering package.
Kit Contents:
- 3-inch heavy-duty front drop spindles (pair)
- 5-inch rear axle flip kit
- front drop shocks (pair)
- rear drop shocks (pair)
Vehicle Fitment:
- 1973-1987 GMC C15 2WD
Important Fitment & Installation Notes:
- Front and rear drop shocks are included, matching shock travel to the lowered suspension combination supplied in this kit.
- Trekline identifies this 3/5 combination as not requiring a C-notch under normal installation conditions; still verify axle-to-frame clearance on the finished truck.
- Rotor check: this SKU is for 1.25-inch-thick front rotors. Measure before ordering.
- Trekline notes that some 15-inch wheel combinations may require lower-control-arm grinding for adequate spindle/wheel clearance. Check the complete wheel, tire and suspension package during installation.
- Perform a professional alignment after installation and verify steering clearance, brake-hose routing, bump-stop clearance, shock travel and fastener torque before regular road use.
- Lowering amounts are referenced from stock OEM ride height; worn springs, prior suspension modifications or existing sag can change the measured result.
Front Drop: 3 inches
Rear Drop: 5 inches
Placement: Front & Rear
Brand: Trekline Motorsports
Trekline SKU: 1250DR051
