Guys , asking for opinions here. My 06 silverado has had transmission service done at 60000 & 120000 w/Dexron VI fluid, pan dropped , fluid changed etc... Has 178000 mi now and thought I'd do it myself. Bought a hand pump at AutoZone and drew out 4-5 qts of fluid (no drain plug). It's cold out and at this point I got a little lazy and just refilled with DexVI fluid the amount I pumped out and called it good! This is the practically the same procedure I do on my wife's Accord per Honda every 30000 mi. I was thinking I might just run this for an oil change interval and do it again and then every 30000 the life of the truck. OK? Waste of time ? Asking for trouble? What do y'all think ?