I don't think there's one that's not electronic.  You could probably go with
a E4OD, but you'll have to add a controller to it.  The only non electronic
4 Speed was the AOD, but you won't find one to fit your bell housing pattern
I don't think.  Besides, it's really not strong enough for your application.

CJB

I don't recall any Ford produced OD's for an FE engine
pattern.  They have been behind the Ford small block V8's,
the 300 six and the 429/460 as well as the Diesel.  The
current incarnation of the E4OD is behind the 5.4L V8 and
the V10.  Your best bet is probably a Gear Vendors unit
which mounts to the rear of your C6.  Take a look here:

http://www.gearvendors.com/f2wd3s.html

Lugnut