Customer Drove 8 Hours...for THIS?? (GM Truck Poor Shifting)

Customer drove over 8 HOURS from Michigan to PA for me to diagnose his 2008 Chevy Silverado 3500 work truck. He uses the truck every day and needs it to be RELIABLE! Main complaint is poor shifting and slipping of the transmission. He often hauls a heavy trailer, so this is important to fix to avoid any further damage. Transmission was replaced 5 years ago, and it never shifted very well. Let s start from scratch and see why this workhorse Chevy is acting up. THINKTOOL PROS: https://www.amazon.com/dp/B08XXWHQVJ?tag=onamzpineholl-20&linkCode=ssc&creativeASIN=B08XXWHQVJ&asc_item-id=amzn1.ideas.NHZL00NIDEPF Enjoy! Ivan