Originally Posted by brushish
I have a 2000 z71. This is the second one i have owned and was never happy with the limited slip on them. I found locker would kick out if the wheels got to much traction and only one wheel would spin. Is there an upgrade that doesn't cost to much that i could do to my rearend to make it a better locker system?
Here you go friend.
On 1999 model year Sierras and up GMC trucks use an exclusive locking rear differential. In fact, it's standard in many models. The locking rear differential senses when one wheel is slipping and transfers power to the wheel with the best traction. When a rear wheel loses traction and its speed exceeds the other wheel by approximately 100 rpm, a governor triggers a cam system that activates multiple disc clutches. The clutches become self-energizing and both wheels are locked together for maximum traction. At vehicle speeds above approximately 30 km/h (you're obviously not stuck if you're going this fast), the governor is prevented from applying the locking clutches so the unit operates as a standard open differential at normal road speeds or when not needed.
Competitors attempt to solve this problem with an optional "limited slip" differential. A typical limited slip design incorporates clutch packs between the axle side gears and differential case. A set of springs puts a constant preload on the clutches so they're dragging all the time — a situation that can cause unpleasant chattering on turns if not properly maintained. Primary clutch engagement is produced by the shape of the teeth on the differential gears, which tend to push apart when driven. When torque is applied to the axle, the side gears are pushed apart to further engage the clutches. However, the slipperier the road surface, the less torque load on the gears before tire slippage occurs and therefore the less clutch engagement to solve the problem.
Feel free to ask any questions if still confussed.