Detroit Axle Complete Power Steering Rack and Pinion Assembly 2005-2008 Ford F-150 & Lincoln Mark-LT 4x4 Fit's 4x4/4WD Models Only - Complete Power Steering Rack & Pinion Assembly To Activate your Lifetime Warranty; you must send in your core unit. Call us when you order to get a return shipping label for your old unit. New Oil and Lip Seals installed to ensure quality performance, Hydraulically Pressure Tested to Ensure Internal By-Pass for Both High & Low Pressure Tie Rod Load, Road Simulated for Proper Functioning