Review on 🔧 ACDelco GM Original Equipment 540-433 Premium Monotube Rear Shock Absorber: Optimal Damping Solution for Enhanced Vehicle Performance by Byron Patil

Excellent! Replaced my aging factory shocks with these "Premium Smooth Ride Suspension" OEM shocks (RPO code ZW7). I don't have the RPO codes G65 (Nivomat leveling shock absorbers) or G69 (air leveling shock absorbers) so these are the shock absorbers I need; Timbo Slims on January 9th, 2016 has some great information. Check your RPO codes on the sticker in your glove box for the correct OEM shocks. There are several categories into which you can classify the suspension of your GM SUV. 1) You have a ZW7 without any of these: Z55, G65, G69, Z71 or ZQ1 (this product is your OEM shock) 2) You have a ZW7 with G65 -> Nivomat self-leveling rear shocks (no air shocks) 3) You have a Z55 with G69 shocks -> Level Control Auto, Air, HD4) You can also have a Z71 or ZQ1 which are other shocks for now. After replacing my OEM 185k shocks they are firm but not stiff, comfortable but not soft. Made my ride quieter, smoother and way more comfortable on the road!