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nope nope nope/ them years they had the same trans could be had as a lockup or a non lockup version. the 2 pin is non lockup, 3 pin is lockup version.
Ive run into this before on my son's 90 W250. 46RH/A518 are 2 names for teh same trans, and it cant be told by that whether it is a lockup version or not.
His 89 Ramcharger originally came with a non lockup 727 in it, both 360 trucks. I still have the original trans here from the Ramcharger.
the RC now has a carbureted 408 in it and a lockup version 727
the non lockup overdrive trannys could have bene had til around 90, didn't see that many....
and as an add on most 3.9 v6 vehicles (especially vans) stayed with a 904/999/998 "904," instead of a OD trans