4 speed or 4 speed OD?

Idaho said
I know the OD is not as strong, but I'm planning to try one behind my 5.9 that will be built to around 400 hp. I'm going with 4.10s. Not such an issue with 3.23s. What will your tire diameter be?

4:10 may make your first gear almost useless as the o/d has a 3.09 first gear ratio
3:23 would be an awesome gear to run with it