1973-1987 GMC C15 2WD 3"/5" Drop Spindle Kit - 1.00" Rotors + Rear 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.
Give your GMC Square Body C15 a clean 3/5 stance with a spindle-based front drop that keeps the factory coil spring in place while the rear axle flip establishes the five-inch rear reduction.
This is the 1.00-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 configuration adds rear drop shocks to the basic 3/5 spindle-and-flip package, making it a useful choice when the rear damping needs to be addressed at the same time.
Kit Contents:
- 3-inch heavy-duty front drop spindles (pair)
- 5-inch rear axle flip kit
- rear drop shocks (pair)
Vehicle Fitment:
- 1973-1987 GMC C15 2WD
Important Fitment & Installation Notes:
- Rear drop shocks are included with this SKU. Verify front shock travel at the finished ride height and replace the front shocks if the available travel is not adequate.
- 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 1.00-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: 1250DR054
