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I have somewhat looked into this in the past, and I asked about it in the transmission section but did not get much information so I thought I'd ask about it here in my home forum.
I have an 81 with a 300 and an automatic 3 speed tranny. I have already modded the engine plenty, and now I want to look at swapping trannys and possibly rearend.
I'm not sure what my gears are in the back, but my question is what is the ideal combination of an automatic transmission and rearend gears for use with the 300 . I hear manual swaps are too complicated, though I would do it if it were possible.
my goal is obviously lots of low end torque (reason I have the 300). I think I'm losing significant amounts of power in the 3 speed.
It takes the place of your standard Tailstock Housing where its 'Puter Controled Under/Over Drive system resides. It gives you 6 foreword Gears & 2 reverse gears.
I would have to suggest a C-6 with the overdrive unit
or AOD (?) with 3.73 or 4.10 gears out back.
BTW I have a '78 F350 dually with 4-spd and 4.10 gears
Pulls like a tractor (good!) accelerates like a sports car (great)
definitely needs an O.D. though... 60 mph TOPS!
I'd not suggest the AOD, because unless you spend a Large Chunk of Rhino to work out all the built in problems w/ it, you'll just have wasted you money.