It's funny this topic has finally come up. I sold my '78 Land Cruiser FJ40 to buy my '50 truck. I didn't realize how much they had in common until I started tearing into the truck.
The original LC engine was the F engine which was around 235 ci. In '75 they upgraded to the 2F which was 258 ci and ran that engine into the mid/late '80s. There was always a rumor around the LC community that Toyota had "stolen" the I-6 from Chevrolet. All I know is it's nearly impossible to kill a 2F on the trail.
I know the transmission in my '78 was an SM420, same as the transmission in my truck. The gears were 4.11:1 in the LC until '78. They changed to 3.73:1 in '79.
If you want more info or exact specs, look at
www.ih8mud.com or
www.sor.com
