1 Material and labor for a wood retaining wall runs approximately $20-$25 a square face foot (and there's usually a minimum charge for small projects), which would be about $1,000-$1,300 for a 50-square-face-foot wall. Materials and installation for a stone retaining wall start around $25-$40 a square face foot and go up depending on materials, site conditions, and other factors.
MFWD (mechanical front wheel drive) or front wheel assist tractors generally have smaller tires on the front and the front axle can be mechanically disconnected from the rest of the powertrain in some manner or another.
Reasons for MFWD. Standard four-wheel drive assumes four equally sized wheels. Tractors with different sized wheels cannot use standard four-wheel drive, as the smaller front wheels would turn faster than the rear wheels. A mechanical front-wheel drive tractor has two axles -- one for the rear wheels and one for the front. The rear axle provides power for most jobs. A button in the cab engages the front axle when extra traction or power is needed. Photo Credit oticki/iStock/Getty Images.