'05 LS6 V Stealth Grey; '14 Z71 SLT Sierra 1500 Stealth Grey
So I found this out by accident. My garage isn't level and as I was struggling to find reverse I either let go of the brake with my right foot or disengaged the e brake and my car slightly rolled backward. At this time, the gear syncronized and I was in gear with no more struggles. Just yesterday I was fighting with the shifter and the parking spot I was in allowed me to roll slightly and poof again I was in gear. At times it can be quite frustraiting trying to get in either first or reverse. Hopefully this can help.