i hadnt dug that deep into it, yet. basically i have an h55f and the stock t case is gonna get cracked open for a rebuild... i figured id like lower gearing, then i priced the gears.. pert near the cost of an orion, so i started looking into this option...There is not a 19 spline Orion option; only 16 and 10 spline.
Marks 3:1 Low range gear sets are for the 19 spline Land Cruiser split transfer case design only.
Since those are completely different applications that do not interchange, what exactly is your question?
im trying to get close to a 60-1 CR in a highway friendly rig. my options seem limited. i have NOOOOO desire to try to double up cases with an h55f.
heres the calcs.3:1 gear set in a split case behind an H55 with 4:11/10 ring and pinion gets you to 60 pretty easily....and should cruise down the highway just fine.