Is a 94 van 700R4 long or short shaft?

A 1994 van's 700R4 transmission will almost certainly have a long shaft. Short shaft 700R4s were used in earlier years and smaller vehicles. The longer shaft is needed to accommodate the larger size and different drivetrain configurations of full-size vans. However, it's always best to verify this by checking the transmission's identification tag or consulting a parts catalog with the van's VIN.