A904...does it need a rebuild?

The trans in my Duster doesnt go into 3rd or reverse.
The guy I bought it from said if you REALLY wind out 2nd...it will EVENTUALLY go into 3rd but you gotta be haulin some serious azz.

Do those symptoms indicate an adjustment that can be made, or is a rebuild necessary? I really wanna get it drivable but plan on the 727 swap soon. I'm trying to get it ready for an event so I need to take the cheaper route. Any help is appreciated.

I saw this kit in another thread IF it needs a rebuild.

http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=9099