Review on 🛢️ ACDelco GM OE 10-4017 Auto-Trak II Transfer Case Fluid - 33.8 oz by Andrew Holman

My new process has clocked 85,000 miles on Auto Track I. I think II has pretty much the same formula. They change color because transmission fluid can leak into the transfer case on some vehicles, and both were pink. Add red to blue and if the fluid in your transfer case turns purple, you have a leak. Anyone who's mixed paints, pigments or dyes knows that a little red goes a long way, so a tiny leak will turn that fluid purple so you'll know before the transfer case overflows. Smooth shifts, maybe a little lag in reaching 4 lows, but that's to be expected. 4 Hi, 4 Auto and 2 Hi all shift, I shift well.