Change rear diff ratio

[kubotaman]

Have 1989 2WD Ram 50 with 3.91 ratio and would like to know how to get to a 3.45 or so. Any suggestions? Thanks!

[Rahtid]

Some of the long bed trucks had a 3.55 ratio

[pennyman1]

2nd gen automatic trucks had 3.45 gears. you need the speedo gear from the truck you get the gears from to keep your speedo accurate