Join Date: Feb 2009
Location: Northern California
Although my LJ is not a DD I find cruising w/ overdrive engaged at hiway speeds and flat areas not all that uncomfortable. I have 5.13s, auto, and 37s. My rpms at 65 - 70 are about 2100 - 2250. Frankly, I don't like running at 70 mph plus although the rig runs out smooth and occaisionally I do it...I simply didn't built it to be a hiway cruiser. Again, I'm not on the hiway much at all with the LJ and sometimes I just run w/ overdrive disengaged cruising closer to 2550 rpms which sounds/feels ideal and puts me at 55 mph, which is a safer "jeep" speed imho.
I'd agree w/ JB, ideal rpms for cruising is 2500-2700. Hopefully you geared for your desired road speed, per/ JB, and geared your transfer case to your wheeling needs.