Freq2002, I'm running a 261, my top gear is 1:1, I am running 20 inch tires. As far as my rear end is I do not know the ratio. It's a two speed vac operated out of a 59'. I had a chipped gear set when I got the truck and I just replaced the third member. Apparently I had a 59 diff in it. I suppose the result of a early truck manufacture during a model change. Thanks!
