i would not put a nv3550 behind a 360/401 engine
even behind a 4.0 engine , the strength of that tranny is marginal
if you really want 5 gears , then the only tranny you should put behind the 360/401 is the nv5600 heavy duty 6 speed .
only the dodge cummins turbo diesel pick-ups came with those tranny`s ( 3500 series )
AN NV4500 from a 3/4 ton dodge pickup would be more then enough to handle a 360/401. the only diff besides the gas and diesel version is the spline count on the imput shaft.
I have been looking into this swap my self as i love my 4 spd but i would kill for an OD in my j20
chrysler stopped using the nv4500 because of the 3rd gear failure woes.
that is why they switched to the nv5600 heavy duty tranny.
new venture only listed the nv4500 as medium duty strength
if i had a 3/4 ton jeep full size pick-up , the nv5600 is the only tranny i would swap in
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