Backlash: is the clearance between moving parts, more clearance, reduce friction, reduce the heat.
Preload: initial load placed on bearings during set up or adjustment, allows for bearings to bed into the cup and prevent free play after the bearing is seat
Helical diff: fWD
LSD Types:
Mechanical LSD
Clutch and cone type LSD
Viscous LSD overcomes the difference between front-rear wheels diameter
Purpose:
Reduce wheel spin
Improve traction
reduce tyre wear
to permit normal slow rate differential action on good surfaces, during low to moderate power operation.
LSD allows diff action under normall cond. Not normal, limited slip prevent diff action. Each clutch pack, absorb load on them, 4 pinion, right angle, meshed with the side gears, 4 extra load carry.
Visco=modern vehicle, front n rear end
4WD: ENgine n Tran are longi,
The advantage of the viscous unit iver the mechanical type is a smooth operating slip limitting unit that provides for lower type wear easier steering and less stress on the driveline components alowing for improved durability.
Third diff systems some 4 wheels drive part time four wheel drive vehicles should not be used on a hard surface in 4wd becasue transmittion
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