yeah,i have an 8 1/4 rear i pulled from an 85 2wd 1/2 ton pickup, was supposed to be a sure-grip rear,as stated by the previous owner,so i pulled the rear cover,and,sure enough, a factory sure-grip,......and a 2.94 gear!!! lol
that poor 318 would have struggled to spin 1 tire,much less both.