My truck has a 12 bolt 3.73 posie in it now and the 3.73 arnt going to cut the highway driving. I got a 81 rearend that had 2.73 in it. I went to put the pinion in my houseing and it hits the housing. so that wont work. My gustion is will a 3.08 ring and pinion out of a 67-72 fit my housing? Also my pos.rear axle case I see is only to work with 3.73 and up gears. Is there any way to use my possi with 3.08s. Thanks