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I recently leveled my 1985 Toyota Dolphin and am turning it into a flatbed truck. I am interested in swapping the 4 speed low geared tranny to one with a 5th gear for better fuel economy. I am hoping that it will be an easy project, but I've never worked with transmissions before. So far I've removed the entire motorhome down to the original framing, cut the frame just over 3 feet shorter (so it's now just over 16'), and fixed my tow hitch at the cut with some lag bolts. The vehicle is significantly lighter at this point and I'm thinking that I will get an increased fuel economy with a 5 speed transmission. I'd imagine the lower geared tranny is unnecessary at this point. I do not plan on doing much heavy hauling either. It was a 1985 Dolphin with a 1 ton dually axle. 22re engine with a 4 speed manual. Will this transmission swap be a worthwhile project? Can the job be done with minimal tranny experience (and having the mechanics book for this rig)? Will a 5 speed of the same year even fit properly or will I need some other parts to make it fit? Any advice I will greatly appreciate.