The Buick V6 drive ratio was the same as the 120 Chevy something around 2.0 ; 1. The 225 HP Chevy was around 1.6 :1 and were all high profile. There is 4” difference in the drive height. The inline 6 Chevy - the Ford 190 shared the same ratio and were all low profile and I believe were between the previous mentioned ratios. You are going to have to connect a battery to the drive and turn it by hand to see what the overall ratio is or take the upper apart and count the teeth. All electric lowers are the same ratio.