GMC Sierra 8 speed shudder and hard shifting fixes (Lubegard and Trifecta)

This video covers two fixes for the 2015 GMC Sierra transmission 1. Transmission shudder: Lubegard Platinum automatic transmission fluid protectant 2-in-1 product = very good solution for frequent shuddering in all gears. Almost 100% resolved 2. Poor shifting, hard shifting/clunking (especially low gears): Trifecta tuning = good solution for poor/clunky shifting. 75% resolved Notes if your vehicle has no transmission dip stick, the video covers how to add the fluid your self with no special tools. the Trifecta tune requires a windows computer the truck that the fixes are on is a 2015 GMC Sierra 1500 SLT with 6.2L engine and 8 speed automatic transmission. The truck had approximately 137,000 miles before the fix and over 140,000 now with good results.