Don't know if my spec. sheet will help you much as it's a bit different from most around here.
TH400 to 4-1 reduction transfer-case , custom super low flash Tq converter that stalls around 900-1,000 rpm.
4.88 diff gears, weight around 5,500 lbs....looking to make strong mid-range power. It needs to be strong between off idle to 5,600 or so.
From what I've read a low LSA brings the usable power range down but high lifts and long durations do just the opposite?