HUMMER H1 has some content and feature upgrades for the 2003 model year, most notably the availability of a rear ELocker locking differential from Eaton, which also appears on H1's new stable mate, the H2.
The rear differential lock operates at the push of a button. Activated instantaneously, it locks the rear differential for optimum slow-speed capability in climbing over large rocks or up long, steep grades. The two rear axle shafts rotate together at the same speed (this mode can only be accessed when the transfer case is in Low Lock, locking the center differential).
The dash-mounted switch to activate the system allows an electrical signal to go by wire through the differential housing and into the locker. In normal circumstances, the locker is 'open' and is invisible to the driver. The rear end has full differentiation between the left and right wheels. Upon detecting the signal, the locker connects the right and left axle shafts and is fully 'locked,' providing superior low-speed off-road performance. The rear axles do not differentiate at all. They act as if they were one single shaft because they are electronically locked together.
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