my trans is kinda broken. it all works good except 5th and 6th. when i shift into those gears, the car doesn't move but you can switch into them and when you do, its like it would be in neutral. so i don't know what to do. should i get it fixed or just swap the trans. i understand the swap would be more expensive but what if it cost $2500 to fix the trans? what do you think would be better?