Full hold manual-shift valve body for the C-4/5

Hello, part of my life revolves around the off-road world involving rock crawling and technical trail riding.

What I'm looking for are modifications to the C4/5 valve body (I'm running sort of a combination transmission to mate to the 4.0 OHV Ford V-6.) that will allow for full hold in all three gears, plus manual shift if possible. Reversed pattern is also a plus, but not required. In order of preference, I need full hold, then manual action, then reverse pattern, and I can live without full manual or reverse pattern, but the full hold in each gear would be very helpful for steep descents.

Anyone?

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Turns out that Art Carr has this exact piece. Cost is slightly prohibitive for me though ($375 + shipping at Wild Horses, over $500 direct from Art Carr).

Love to duplicate this for less bucks. Is that possible with a regular C4 valve body?

wildhorses4x4.com/product/Art_Carr_Off_Road_Valve_Body/Art_Carr

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TransGo has full manual forward pattern Shift kits for these. I need to know the exact year you are working on?

I'm not sure the exact year, as this is a custom build from a core for an off-road truck. Is there a way to tell by a code on the unit?

FYI, the transmission is going behind a Ford Explorer 4.0 V-6 using 1983 2.8 bellhousing, tailshaft, and extension housing with a C4/5 of unknown vintage.

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