OK guys, I am dropping this Cummins into my chevy C20. The way I figure it, I will need a 2.73:1 gear ratio to acheive 55 mph at about 1800 rpms. Have any of you had this problem. My gear ratio is 4.10:1 now and I am using the 3 speed automatic trans behind the 90 model cummins. this seems like a high ratio for a truck. Can you help me in this matter?
Curtis Traylor
Curtis Traylor