After searching high low and sideways I finally found (to me anyways) the holy grail of obscure transmissions. A lockup A999 out of soon to be mine 85 B250/318 passenger van I bought for parts.

One owner van that the guy maintained fairly well over its lifespan, its got approx 230K on the original transmission that was given regular fluid/filter changes.

I am looking to do good stockish rebuild on the transmission and then drop it into my 79 B200/318. I looked in the usual places and besides going through the dealership for the hard parts like planetarys and snap rings. I couldnt find a whole lot for it ? The double wrap rear band part number I have from the 85 parts catalog comes back as no good with mopar ? Is it the same band as the newer 42/44 RH/RE transmissions ? Does anyone in the aftermarket offer new or remaned planetary units for these or is Mopar the only source ? I'm sure theres more i'm forgetting but those two things are what came to mind right now.

Thanks.