The 'Beast'! (1100-lbs. dry/36 1/2" long without fan; with fan - add 4")Will be bolting it to a 'Stubby' version of a rebuilt 47RE trans with an upgraded torque converter and valve body; this trans will measure about 26 1/2" long. From the center of the u-joint on the Rockwell to the rear inside face of the (OEM)rad-core measures approx. 76" +/- about 1/2". Add about another 5" or, 81 1/2" overall space between the center of the diff u-joint to the inside face of the rear wall alum/vented panel.