sounds about right for a Cummins 4BT swap, depending on tire size.
redline is like 3000rpms, and you probably want it to run around 1500-2000 rpm on the highway.
hey now I have the 32000 rpm spring in it!!
But yes 3.07s put me at about 1700 or so doing 70mph on the highway with 31s or 33s, forget my last calculations which is pretty much ideal. Right now with the 4.10s and the 31s doing 70 down the highway I am over 2200 rpm I think (no tach and forget what it worked out to) which is sort of fine but out of its efficiency and doesn't give you any room to speed up if needed. 3.07s it pulls like a freight train to 90+
I drove it up from GA to WV end of last summer with the 4.10s and it was miserable.
with the 4.10s and the torque though my twisty hilly drive to work though I rarely need to leave 5th gear I can go from 20-60+ never shifting, but I"m always looking for 8th gear when it is straight.
Anyway my new trans brace is making fitting my exhaust quite fun, decided to give up on reconfiguring the existing pieces and just starting from scratch again. The downpipe was stainless and the rest was mild which I wanted to redo anyway as well as get rid of the muffler. So she sits while it snows unable to be driven.
The few rips around the area with no exhaust on it the trans feels great, much more solid, no more hitting stuff in the cup holders or jamming my finger on the parking brake if I put it in reverse before releasing the brake. Have not warmed it up fully but I suspect cabin vibrations will be up a bit, however it will be worth it with the way the trans feels now.