Check out Lawrence Tolman on YT. He's one of the guys from Powernation on Red Tide, now doing his own thing.
He's building this RCSB 4x4 converted to AWD. He's currently working at installing an LSA supercharger. I think in the beginning he said he was going to keep his 4L60e, but last video he said he's going with the 80e (I think he's repurposing the 80e from his
Ugly Truck?). I haven't watched all his latest videos though, so I'm out of touch with what's he's doing.
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IIRC, there was some older threads on performancetruck.net and they were saying a guy custom made those output shafts for the NP149, but it was like $600 at the time (2012-ish thread?) and I don't think the guy was even active anymore?
Sponsor's Announcements, Sales, and Specials - NVG149 / NP149 to 4L80E & 6L80 Input Gear Adapters - Run AWD With your 4L80E/6L80! - I've been selling this adapter for over ten years over at SilveradoSS.com but I still don't think there are a lot of people that know about it. Our adapter allows...
www.performancetrucks.net