You might have tight clearances by the steering column, although you could just set the motor farther forward. I see no issues with the 700R4 tranny, but I would use the stock deuce t-case to keep the driveshaft angles stock. Can't see any real advantage to changing the t-case out. All you really would gain is an engine capable of higher RPM, and with less torque. HP is close to the same. No multifuel capability, which makes it a diesel only proposition. Some would like the auto tranny, some would not. Certainly do-able.
I wouldnt do it. In my experiences, the 6.2 is fine for a 1/2 ton or 3/4 ton truck that doesnt haul heavy loads and economy is needed. The empty weight of a duece would really make that motor work really hard and without a trubo, they are absolute turds. If you were going to do all that work to change out the motor, you should spend a little more and get a nice medium duty diesel engine. Just my opinion, I know alot of people love the 6.2/6.5 engine like I used to but lets face it, 240lbs of torque aint gonna cut it in a duece.
Six cylinder inlines are what fit a deuce well. The small six Cummins is popular, and I would imagine there are others that would fit as well. A 4-71 Detroit would be a fun swap. The 300 CID Ford gas straight six is supposed to make a good motor for a deuce. I used to drive dump trucks with the 240 or 300 Ford, good motors in that application.
Still hard to beat the multifuel. It fits, is available reasonably, and makes decent power and economy. I can't imagine swapping to a different motor except maybe the Cummins, and then only if I had a wrecked dually with a good engine and a deuce with none.
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Robert Miller
Currently out on the road programming robots.......
Inline ford 300 sixes were great engines. My grandfather was a carpenter and he would order a heavy 3/4 ton truck every few years with the 300 and 3 on the tree. They were not fast but they did have alot of torque and would pull a heavy load all day. Downside is it would take you all day to get there.
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Chuck Graham
1969 Kaiser-Jeep M35A2
My first new truck was a 92 F150 with the 4.9 (300 C.I.D.) Inline 6. It was a great motor, a little thirsty for a 6 cylinder but I loved it. I dont think much changed with them over the years besides adding fuel injection.
like they said, 6.2s are good for light duty but no good for a 5ton...also the 700 isnt gunna get the job done they have ****y clutches and are geared too high, ur gunna need a 400 or a 4 speed w/granny low. and the t-case personally i would go with a 205...but thats me.
Now yer talkin! Although I think a 71 series would be too tall, crank center-line down to front axle. NAPCO makes a conversion kit to put a Detroit Diesel 4-53N in a deuce, and it requires slightly limiting suspension travel to not wipe out the oil pan... a 4-71N would have the same issue but worse.
If your multifuel blows up, or you want to mate up some other heavy-duty diesel to the deuce drive-line because you like a particular engine (like I like 2-stroke Detroits), I could understand. But the 6.2/6.5 are LIGHT DUTY diesels. They would be putting out max power all the time to run the deuce and would not last long. Likewise with the transmission - a 9 or 10 speed Road Ranger makes sense and would last, but a light truck transmission is a waste of the effort required to do the swap.
You get what you pay for...
Jon
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Where are we going and why am I in this handbasket?
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1951 M52 Tractor with 6-71N Detroit Diesel
1952 V18A/MTQ Studebaker Earth Borer - Pole Setter GASSER AND STAYING THAT WAY!
1962 M197A1 Converter Dolly
1966 M274A2 Mule
1967 M105 Trailer
1968 M35A2 Kaiser-Jeep W/W
1968 M146 Trailer
1970 M274A5 Mule NEED REAR ENGINE GUARD. STOOPID $$$ WILLING TO BE SPENT - PM ME!!!
1984 M1009 Blazer
Boyce equipment sells bell housing adaptors to put a duece tranny on chevy v8's. But i think i's stick with the multi. I have a few 6.2's and a 6.5td. The multi is much more relible!!!
Although it is often viewed as heresy, some of the Japanese medium truck diesels are tough little engines. I have never looked at how hard they would be to swap, because I am happy with my multi fuel. You couldn't afford to feed a gas V-8 in a deuce, not for road trips. Now for mud bogging, where you don't care about fuel consumption, I'm sure there are many better choices than the LDT engine.
Bottom line, for most users the multi is hard to beat.
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Robert Miller
Currently out on the road programming robots.......
gsrvsdv
You get what you pay for... 
