You make my job interesting LOL. Back in the days of 4 speeds, engineers would take (rear axle ratio) x (1st gear) and try to get that to equal '9'.
This is your typical 4.11 rear x 2.20 first gear with a 15" rim street tire (say 26-27" tall)
For your DR4 with the 3.08, you could probably run a high 2 series rear gear and be comfy. I sell a fair amount of our M22Z which is a 2.98, 2.04, 1.47, 1.00 typically (we can adjust 2nd and 3rd but this is the most popular).
The easiest way I can equate it to a guy would be to take that same classic example (4.10s w. 2.20 rockcrusher) and if you went to 4.56s in the back, thats the same feel in 1st gear that you would have with your Jerico and 3.23s.
For most guys who are looking to get a 5speed for fuel economy, and the amount of time we drive our cars (especially here in the snow belt), it takes a LONG time to offset the cost of the swap.
I can put you in touch with a guy who has a Z-set in his car if you want.