I have the stock 3.90 rear end in my pickup, and the 4 speed is a Muncie with 1.0 ratio in fourth. I put 29in dia. tires in back to give a little more speed versis RPMs. Still winds up pretty good.....

'55 2nd series 3100 "Red Ryder" http://s1348.photobucket.com/user/c...&_suid=13893932572500736492512997429