97 gt T-45 tranny problems

i have a 97 gt with the t 45 in it and it had been a little difficult to get in reverse it would grind some times a bit then go in then i took it out tonight and it was fine drove it later on and i down shifted was going slow and noticed it seemed like it was hard to get into gear well i drove it another mile and took off again and it was all #ucked up went from first to seccond and it was grinding while it was in gear 1 - 4th does it 5th is fine and now no reverse i drove it home in 5th that was fun i just built the car and now this geesh some one help

i have a 97 gt with the t 45 in it and it had been a little difficult to get in reverse it would grind some times a bit then go in then i took it out tonight and it was fine drove it later on and i down shifted was going slow and noticed it seemed like it was hard to get into gear well i drove it another mile and took off again and it was all #ucked up went from first to seccond and it was grinding while it was in gear 1 - 4th does it 5th is fine and now no reverse i drove it home in 5th that was fun i just built the car and now this geesh some one help

The whole thing needs to be torn apart, inspected, and rebuilt cause it sounds like you have multiple problems starting wit bad synchros to possible shift fork roll pins busted to possibly even missing teeth.

messed wit it again and it will shft 1-4 and it sounds like the gear or something ratteling around in it against the other gear and shifter is tight like something is binding up and ther is no reverse you can even hold it there and nothing just grinds damn thing all this wrok ive doe and now this it was originally a 95 v6 took everything i mean everything off of a 97 gt and put on it put about 400 miles on it and now this i have no luck