tylerboyd

my 04 f150 4x4 xlt seems to have trouble picking which gear to be in at around 10 mph if im not accelerating. It'll slam into 2nd a lil loud and then go back into first. At work we have a line going out the gate at quitting time and it does this the whole way. I've been putting it in 1st manually but i was wondering if a trans. fluid change/checkup was in need! Thanks