Trying to find out the actual length from the back side drum to drum on 67 chevelle and a 70 if they different in length:sad:..Thanks

* 1964-67 Chevelle rear ends were manufactured by the Chevrolet Gear and Axle Division. The housing measures 53.25 inches from backing plate to backing plate and with the brake drums in place, the total width is 60.00 inches. Axle tube flange-to-flange is 54.25 inches.

* 1968-72 Chevelle rear end housings measure 58.5 inches from flange to flange, and with the brake drums in place, the total width is 62.5 inches. (Note: Other sources put the total width at 61.125" to 61.25".) Axle tube flange-to-flange is 55.25 inches.
chevellestuff.com/qd/generic_rear_axle_info (http://www.chevellestuff.com/qd/generic_rear_axle_info.htm)

so an inch difference if im reading it right..thanks

You got it.