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Swap a three speed auto for a five speed manual?

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I don't do hardly any hauling at all. The most I've ever hauled was a big water container for a well. I mostly bought the truck because of mileage, performance, and because I LOVE Cummins. My truck right now is a three speed auto. On the highway, going 70 mph, it sounds like the engine is really running high. I don't have a tach (one of the many things i need to get), so I'm not sure how high it's actually running. All i know is for long drives, I want to keep the rpm's down. I think a five speed would also help with mileage and performance. Is it worth switcing it to a five speed, or is there something else I could do to get the same effect? Thanks.

Josh

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'91 D-250, Cummins, 3 speed auto, 165k, Hurculiner bedliner, after market bumper,custom one tone metallic blue paint job (sorry no pics) and completely stock... . for now anyway
 
I've got the same problem. I was wondering if a 518 would swap right in, or if I would have to do serious modifications.

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'90 LE W250, 727, 3. 07, Line-X bedliner, 140k miles,
 
Josh, you may want to check the rear end ratio. You truck may have the 4:10, if so it would probably be cheaper to switch to the 3:54.

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92-LE,4x4,5spd,3. 54,Borgeson steering shaft, Tach,Isspro Pyro & Boost, 16cm2, PW injectors
 
You need to look into installing a gear vendor, We just finished rebuilding my 89 D250 from a salvage truck, to another 89 D250, swaped motor, trans (rebuilt 3 speed 727 trans) added the gearvendor and used my 3:08 open rear end.
I used to run 70 mph and pull 2450 rpm and know at 70 I am pulling 2000. Truck runs like a Swiss rolex.
Look at what your rear gear ratio is, it should be on a tag attached to your Dana 70 cover bolts.
Email for more info. I also have a couple
Mopar tach kits for the 89-91 #82201051 that I may be selling in the future.

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93 D250 Club, Banks Exhaust. Stockland shell. 80k
91 W350 Standard. 228k
89 D250 Rebuilt from Total, Banks power pack, wastegated turbo,intercooler,
Gearvendor , 727 3 speed auto, 3:07, goose neck, 5th wheel, Stockland shell.
Flex steel seats. 150k
 
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