I have a 98 k1500 with the 5.7 and 4l60e with 124,000 i was driving the other day and thought I felt it slip only to be confirmed with a check engine light with trasmission component slipped codes. It was a little low on fluid so I topped it off in hope it would fix the slipping. The check engine light came back on after 30ish miles and the truck started shifting hard from 1-2. The fluid smells slightly burnt. Should I drop the pan and change the fluid and add some Lucas transmission fix or just pull the tranny for a rebuild.