we went wheeling yesterday and now my trans wont down shift into 1st it will shift from first to second if you put it in 1 to start with but in drive it goes second to third and down into second. when you come to a complete stop it just stays in second. if you gas it while in second it just bogs down it doesnt down shift. checked the linkage it looks ok along with the kick down. the trans fluid is clean and full. any ideas?? it is a TF999