With my 200r4 set-up,with p275/60-15's at 70 mph is at 2,200 rpm. I was running a th350 and the same mph was 3,000 rpm. that puts the rear gear ratio at 3:42 I believe. I'm telling ya, that rpm drop makes for a boring ride if you are noticed to the high rpm you are used too. I just drop it into 3rd and right back to your th350 ride. 1st gear is very impressive!!