How do I tell if I have a 1/2 ton, 3/4 ton, or 1 ton rearend in my 78 c10 scottsdale? I have put a lot of time and money into bringing this beauty back from the dead, she runs strong but very slow take off. When I rebuilt the tranny I added a 2500 stall but she takes off like I'm stepping on the brakes... any ideas?