Quote: depends on how much highway driving you are going to do. What are the engine specs..and on and on. 3.91's are a good gear for a b-body. With a set of 275/60/15's you can cruise at 70 no problem. 3.55's are ok but they are dog gears compared to 3.91's...as are 3.23's. Try the 3.73's they are pretty new to mopars. Let us know how they run.
I have 3.91's on 28" tires and drove my car from Sanfrancisco to Chicago no problems and they have some pretty high speed limits out west. It can get a little buzzy on the highway but it isn't terrible below 70-75.
I have 3.91's on 28" tires and drove my car from Sanfrancisco to Chicago no problems and they have some pretty high speed limits out west. 
It can get a little buzzy on the highway but it isn't terrible below 70-75.
