yeah my rear end is the 3.90. I was thinking of going down to a 3.38 ratio rearend. I'm just still kinda torn between the 3 spd OD or the rearend, I'm crunched for cash and only would want to spend about 500-600.00 on this.Plus I would think putting a rear end in would be less time and labor wise as a tranny But the thing is I have time on my side as my truck drives beautifully right now in the city. Anyone know out there about what I would be spinnin' RPM wise at about 65MPH with the 3.38 rear gear?

Thanks,as always -Danny

1960 C-10 Stepside,Longbox
235,4spd 3.90 diff.