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Looks like your pan is leaking for sure. Pretty easy procedure to fix. Buy a new gasket based on your tranny model, I believe you will also need roughly 6 quarts of dexron ATF. Drop the pan, clean the mating surfaces, repaint the outside of the pan if you feel like it, and re install using a star torque pattern with the bolts. There are YouTube vids about it. Once that is sealed, clean everything very well, and check your levels using the dipstick while truck is running. Important to CLEAN EVERYTHING WELL after you change the pan gasket. Sometimes a leaky pan can cause fluid to blow all over the place and make it look like your cooler lines are leaking. Either way, based on the pics, your pan is definitely leaking, so reseal your pan first, And that should slow the leak down or stop it. Also, while you have your pan off, how about putting in a new trans filter? Again, not hard to do, just make sure the rubber gasket on the old filter comes out with it. There are threads on this site about changing transmission filters. Not a big deal At all, and this would be a perfect time to do it.Plus, if the previous owner neglected the maintenance , fresh atf and filter would be good for that trans. Make sure you buy Dexron compliant ATF. Read the back of the bottle, and either measure how much you drain out or buy at least 6 quarts of atf to refill.This is a semi messy job, so make sure you have a large pan or something to drain the old atf into. Bring a lot of shop towels too. Good luck.Edit: just searched YouTube. Search “Luke’s garage how to change your transmission fluid and gasket.” He takes you Step by step changing the pan and gasket on a square body.
clean it up with brake cleaner and try to find the leak. that gasket is reusable. i would clean it all up and maybe even change the fluid while youre at it. proper tq for those bolts will fix most leaks. think its around 15 ft lbs. if after all that you still have leaks you need to trace them down. remember driving the truck will cause wind to blow the fluid all around. mostly down and to the rear but not forward, even if your hose is leaking it can cover the whole trans much like you have. so clean it all up tq the bolts and see where youre at then