95 T100 ext cab 6 cyl 5 speed dx 2wd. Bent the rear differential axel housing now both rear tires wearing. Junkyards they ask for gear ratio either 3.77 or 3.91 for the correct replacement. The gear code from my VIN plate is A08A. Will either fit without any problems. Cant find an exact information on my axel code either is it 138mm, 4.11 and 2 pinion. Lost in limbo, Help?