Dodge Camper Van w/318- switching 3-Speed to Overdrive transmission?

Look for a 46RH, or as it's more commonly called, a 518 transmission that was used in Dodge trucks and vans up to 1995. They can be easily controlled with the kit from PATC, to make it shift into lockup and OD. The later 46RE's are pretty much the same trans, but it costs a lot more to make them shift because they are electronically controlled instead of hydraulically controlled like the RH version. You should look for a transmission crossmember and mount from any B van that had an OD trans from 90- 2000? something. Any of the real late ones would have had a 5.2 or 5.9 Magnum motor. It might even be a bolt in, but I'm not sure? Spend the money for a good heavy duty torque converter, and if there is such a thing...a HD front pump. There's a couple of really good transmission guys on here that know their stuff, so maybe one of them will chime in.