That's what I would go for, a M57 or similar 3.0 litre V6 diesel. Having bought a jeep V6 diesel, when it did work it was a rocket ship, but unfortunately it didn't make it home from the dealer so I got my money back and bought a Hilux
The 6BT is 250kg heavier than the 2KD it replace, but with removing the front diff and shafts, that's 50~100kg weight saving, so with body off it's only sitting about 1/2" lower than when 2kd was in with body off, plus the body will be stripped of some weight, not a lot I admit but no ecus, heater box is removed and the zf s5-42 is a little lighter than the stock toyota box with transfer box
So all in all I reckon about 150~200kg heavier, but thats mostly behind the front axle line as well which is good
Probably not a huge difference to having a big ARB type winch bumper hanging off the nose!
I have a 40L air tank fitted opposite side to the diesel tank as well
Body lift is 7~8 inches, but not on tube spacers, I have built custom box section lift blocks for the rear 4 cab mounts which will be braced to the chassis rails, and then the front body mounts are a custom built crossmember that fits across top of chassis, to stiffen the front end and give the required lift as well
Its quite agricultural build wise, but its done for strength and simplicity rather than winning style awards!
Its still not finished, but is getting there slowly between other jobs and typical stuff!
Once its done, I will make a thread and upload a load of pictures to show the build and will run through everything done!
The engine is now setup as required though with a 3200rpm spring and a +40hp boost pin, so with a tweak of max fuel screw as well it should be pushing 200~220hp at approx 2800rpm, and peak torque of 600~650lbft (~810 to ~880nm) at 1600~1800rpm
But with masses of torque from idle (300lbft at just above idle)
Gearing on the toyota diff which I believe is 3.583 puts 60mph at ~1850rpm, right in the sweet spot, and 70mph is ~2150rpm if needed, thats on 30" measured 245/75R16
In time I plan on changing the rims for either modular or something else with a wider offset but still 16"
ideally 30~50mm more to kick the wheels out nicely, and fit 235/85 or 265/75 or possibly 255/85 (33 inch) as that will drop rpm approx 100~120rpm or 150~170rpm respectively