I have a 2000 F250 (5.4/2wd). Yesterday the transmission started acting up. The tow/haul light keeps flashing, and the truck won't shift into 3rd 90% of the time. When it does, it shifts extremely hard. Am I going to need a new transmission, or is there any chance it will just take a simple fix? I unfortunately had to drive it about 10 miles back to my shop after it started acting up, hope I didn't cause any extra damage to it... And, yes, it does have plenty of ATF in it lol.