If your 3rd and 4th gear went out in a v6 231 4 speed manual 1981 El Camino do you need a brand new transmission and if so where do you get one?
You may not need a new transmission entirely. You may just have to get your transmission rebuilt and they mey just end up replacing those gears instead of rebuilding the entire thing. Simply take your vehicle to a shop that specializes in transmissions and see what they can do for you. Best Of Luck