Range splitter overdrive gear box

[Rubble]

Just wondering if anyone on here has installed an advance adapters range splitter overdrive gearbox.It mounts to the bell housing ahead of a 465 4 speed.I got hold of an 84 CCLB 4x4 : 454/th400/205. I want to get rid of the auto & go with the 2 speed ahead of the 465.I know some will suggest to put a NV4500 instead,but this way you have 8 speeds verses 5 and 2 speeds in reverse also.Besides I already have a rebuilt 465 in the shop,if I go 4500 route it's gonna probably need rebuilt plus initial price of purchase.Having 2 sticks would just add to the cool factor.This is going to be a towing/hauling unit.Any kind of input is appreciated.
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