I'm doing mine this weekend. My Truck is a 2015 5.3 1500. I already did the 3.42 to a 4.10. I installed that over a year ago. Sick of the open rear. Been going back and forth between the Yukon 9.5 Clutch style POSI. The Yukon is a direct swap now. No ring gear spacer needed. But I decided on the Truetrac and ring gear spacer. Stronger, no clutches to wear out. No additive needed. Just high quality non synthetic gear oil. Sent from my LM-G820 using Tapatalk