66 Dart GT HT Whatsitgonnabe?

Hi Anders,
Now i could be wrong, but i believe stock the rear axle is supposed to sit at 5° nose down attitude from dead flat not in relation to the driveshaft. Remember on accelleration the rear axle will want to twist opposite of the direction of the wheels its turning. Action / reaction. This will make the rear axle prop shaft or input shaft move upward to a flat or 0°