The motor is the 3.4 liter 5VZ-FE engine. It is completely stock. Fully loaded, the truck gets about 14 mpg at 60-65 mph. The 77,xxx miles are original. I purchased the truck in 2008 with ~32,000 miles. I am the second owner of the truck. The first owner was a female school teacher in Illinois and I purchased the truck from a Toyota dealer after its life as a commuter.
The truck has a manual, 5 speed transmission with the ADD transfer case which allows you to push a button on the transfer case shift lever to go into 4 high. To go into 4 low, you need to stop the vehicle (normal regardless of 4WD system) and then move the transfer case shift lever (all from inside the cab).
Original gear ratio was 4.33. With the camper installed, the truck became slightly tired. It would move without any drama, but the throttle response wasn't snappy. With the 4.88 differentials, the truck has great throttle response on incline starts such as the streets of San Francisco or anywhere in mountainous areas. I'm originally from Colorado and the truck was intended for a trip to Chile so I configured it for those applications. However, the improved throttle response from lowering the differential ratio didn't compromise the top end too much. It still zips right along at 70-75 mph if you're inclined to go that fast.
The truck has a Line-X bed sealant which I had done specifically for the camper.