4:10's are a good start for plowing. Have the transmission serviced, possibly send the oil out for analysis, and heed the advice for a trans oil cooler. Some have fans that come on when the temp rises, pretty trick if you ask me. Also a trans temp gauge is reccomended. I prefer a quality local trans shop over those chain store ones. Next have the radiator flushed and the anti-cavitation additive put in it. If you haven't heard of this, research it. Make sure your fan clutch works also, your engine needs it when that big sail of a plow is directing air away from the radiator. Make sure batteries are good and carry spare alt. and tools to change it. An f250 could benefit from front air bags or an add-a-leaf. A little research will find the ATS parts you need to change out to reach the turbo's full potential. Ford forced ATS to detune the factory turbo for your '94 so it wouldn't out perform the powerstroke due out in '95. dyoung14 highlited important stuff also. After all of this is done, I would reccomend an intercooler to bring you to the next power level. Last note: I baby my truck the most when plowing. Most people pay hourly to plow and rather see the truck last the whole storm than break down early on because the driver mistook the truck for a bulldozer. Best of luck and keep us posted on your upgrades. Check the marketplace out for parts also.
