99 GT Not shifting into 3rd or 4th

[Chaseskywalker]

Hi everybody, I've got a 99 Mustang GT manual that I just put a new (to me atleast) T45 in, and outside the car, it shifted into all 6 gears and it spun fine, but now that its installed, 1st, 2nd, 5th, and reverse work perfectly, but it doesnt shift into 3rd, no grinding or anything at all, and 4th grinds really bad. Is there any adjustments that can be made that I can do, or is this transmission screwed?

 

[zlightlystoopid]

Bad snychronizers bro had the same problem either get it rebuit or buy another tranny

 

[Crockettg24]

I had the same issue on my 2000 right after I bought it and the throughout bearing went out so while I had mine out I went ahead and pulled my apart to find a bad shift fork