Detroit Axle Complete Power Steering Rack & Pinion Assembly for Mercedes Benz C-Class 4-Matic No-Sensor 4-Matic (All-Wheel Drive) ; Without Speed-Sensitive Steering - 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