so long story short the tranny lost 5th a while back so i got a new one from the yard that one made noise in 1 2 and noise in 5 to the point you couldnt keep it in 5th so pulled that one out the yard didnt have any more so got my money back and got that one as a core so i had a classmate that had a rolled 86 5 speed so from the description i was given of the tranny figured it was a tk5 turned out it wasnt it was another fm145 but put it in anyway drove it maybe a week and a half and wouldnt shift into second one day on my way home it started grinding really loud and the engine just kept reving and wouldnt go anywhere tried shifting out of gear and wouldnt the truck wouldnt go anywhere luckily i was a half mile from home called dad pulled it home dropped the pan and the first countershaft gear was junk most of the teeth were snapped and the countershaft could be moved about a good 1/4 inch up and down turns out the reason it wouldnt shift was because the gear hit the shift rail and took a chuck out of it so pulled the core apart 5th gear was missing 2 teeth and the first gear on the countershaft was starting to flake so ordered the parts to rebuild it so now about $250 later im ready to rebuild the fm145 and have a new 5th gear set, a rebuild kit with syncros, 5th gear nettle bearing, and the cluster gear