Info. about specifcations on my 1994 E350?

I have been trying to find out all the major information about my van. I need to part out due to body damage. I have tried using the VIN #, but all I get for searches are carfax, etc. My VIN # is 1FBJS31H4RHB58512. I am trying to sell on ebay and need as much info. on front and rear, ratios?, transmission that comes with the van, etc. I found 5 transmissions that are supposed to fit to replace, but don't know which was original.

Also, if it not too much trouble, could you give me a likely price to ask for the engine, rear and front axles, and transmission,
I do know one thing. It is a 1 ton van and the rear axle has dually (sp) capabilities.

I appreciate any help you can give me. If not, please let me know if you have any contacts I could use.

Thank you so much!

Laura