Fits Silverado & Sierra 1500 4WD(1999-2006 & Classic) 4" Lift Kit 25830 automatic and a speedometer wiring harness

and a speedometer wiring harness is included

137BC OEM Part Number 078

1973-1986 Chevrolet C10 Suburban

(4) Bolts and interchanges with OE parts 17420-0H010

Fits Silverado & Sierra 1500 4WD(1999-2006 & Classic) 4" Lift Kit 25830 automatic and a speedometer wiring harness4 Inch Lift Kit Chevy Silverado & GMC Sierra 1500 4WD (1999 2006 & Classic) This NTD kit is easier to install, handles better than ever, and looks killer from any angle. Gain greater clearance, better handling, and the cleanest looking 4" lift available! A set of lifted front knuckles and 5" rear blocks allow your 1500 to run up to 33" tires, while a full set of drop crossmembers, differential drop brackets and non torsion bar drop brackets keep