1990 mazda b2200 drive train

No it will not. Only a comparable engine from another mazda b2200 truck and I think the b2000 and possibly Miata, 2.2 engines were about the same from 1986-1993. You can pretty much count out just dropping in a motor from a different manufacturer for any make. Fords don't fit chevys, etc. etc., This would require you modify the entire drive train and quite possibly the electrical system, cooling system,etc. Definitely not worth the hassle involved.

Try to rev the engine while at neutral if you get the same vibration to pinpoint if its from the engine or the drive shafts. If the issue occurs at a certain rev it may likely be the variable valve unit. Check if possible if you can get errors from the computer.

search... how to determine gear ratio

in all honesty havent a clue without a drive ,sorry

Yes.

remove the rear shaft from a 1990 full size gmc van (g-van) make sure the one you select has the scew on sleeve at the front of the rear section of the shaft
this will be the right lenght
take the rear yolk off your old shaft cut of the ball socket now get the same u-joint your truck calls for and mount the rear yolk (the section of the shaft that bolts to your rear end) to the new shaft
this works ive done it
you eliminate 2 of the 4 u-joints and lighten up your shaft this releives strain on you tranny and rear end when these u-joints and ball bearings fail they cause the vibrations which ruin the rest of your drive train also you gain 10hp
i spent 300 bucks rebuilding the OEM shaft and got no where so for 25 bucks i did this

I just had the same problem today it was the master cyclinder
its a common mazda problem

hey there . if you had a meachine shop build it take it back. it could be a bad ring or valve gide. you can pull your plug and see whitch cilder is burning the oil.or maybe it just needs to be broke in. but i do not thing that your prolbem ok have nice day

I do not know that it makes a lot of differance. But I would put the closed end to the front of the truck to help keep the dirt out of it better.
Good Luck Jerry
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I have the same thing but mine is between 45-50 mph. I read about this a while back in a magazine for people that pull campers, the problem exists in all vehicles although its not as noticeable in every thing you ride in. There is a certain "point" at which your speed and engine speed reach, that causes a phenomonon that causes a vibration. Engineers relate it to "harmonics" which is a similar issue but in the electronic field of study. There is nothing you can do for it, and it varies from unnoticeable in some vehicles to driving you insane in my 1989 Mazda B2200. I had an '89 Ford F-150 that did it at 35 mph and a 2001 Dodge Diesel that did it at 45 mph, but those were the only three vehicles I've ever driven and noticed it.