converting 4spd manual to 5spd

[4x4chevy]

I have a 86 Chevy 4x4 1500 with 6.2L and 4 spd standard. I would like to convert the granny low 4spd to a HD 5spd with an overdrive. Which GM 5spd will work (I heard the New Venture 4500 does) and is the a direct swap in or does it require an adapter of some sort? Any advice is appreciated....thx

[79GMC4x4]

I believe it requires a bellhousing swap.  Check these guys out, and they offer e-mail advice.  Or phone them:www.drivetrain.com/main.html

'79 GMC shortbed 454 th400 14 bolt FF NP205 Dana 60