Scoutii 345 to 392 engine swap

S

scoutinaround

New member
I've come across a running 392 that supposedly came out of a 74 loadstar. I have a 74 Scoutii with a 345 in it and im wanting to swap the 392 into it. I'm wondering what I would all need to do to swap in the 392 motor.

My goals are I want to keep an international motor in it and I would like to be able to do interstate speed (75-80) and not reving the crap out of it. The motor would be paired with a 4 speed transmission(I think it's a T18), T20 transfercase(haven't found a D300 yet), dana44 axels with 3-73 gear ratio, 4" lift on 33" tires.
 
You will need to keep the SII oil pan, oil pick up and one duplex stud holding oil pick up in place. LoadStar uses a 13" clutch, the flywheel will be drilled for 13" cover and possibly a 12" but not 11" like the Sll. I highly recommend a new 12" driven disc, rebuild the cover, resurface flywheel and have the flywheel and cover neutrally match balanced.
75 Scout gray soft top snow lights trailer.jpg
 
With those gears and tires, you'll be turning about 3000 rpms to do 80. 3600 is redline for a 392. Without some major improvements to steering and suspension, you'll be white knuckling it for sure at those speeds. Scouts are more of a 60-65 vehicle without some real attention and money payed to the handling characteristics. It's cheaper to slow down a bit and enjoy the journey. Think smiles per hour rather than miles per hour.
 
If your goals are a higher speed, either a overdrive transmission or axle gears is more of the upgrade needed.
 
My plan for the steering so far is I'm having the steering box rebuilt by Red head steering, all new steering linkage, I'll be adding a steering stabilizer and a front frame x brace. I'd like to do a cut and turn on the front axle as well but I can't find anyone in my area and I can't tell in the rebuilt axle I bought has had a cut and turn done to it already.

I'm aware 80mph a stretch due to the motors not being a powerhouses and not high reving.honestly I'd be happy with low 70s up to 75. What would be a better gear ratio or would i be better off staying with the 345.
 
You already have 3:73's, and at 2500 rpm you should be going about 65 mph. An overdrive transmission of some kind will be your ticket. I'll throw a number of .73/1 overdrive, which would net you significant decrease of RPMS. At 2000 rpm, you would be going around 70.
 
You must log in or register to reply here.
Back
Top