Trailblazer 4WD Front Axle Actuator and Housing 600-115

This is the front axle disconnect assembly for the GM GMT360 SUVs: the intermediate shaft bearing housing plus the electric 4WD actuator, as shown in the photos. It crosses to Dorman 600-115 and GM 12471623, 12471625, 12471627, 12471628, 12471629, 12471633, 12471636, 12479081, 12479197, 12479302, 15801507, 26036092 and 26053326.

Fitment: 2002-2009 Chevrolet Trailblazer, 2002-2006 Trailblazer EXT, 2002-2009 GMC Envoy, 2002-2006 Envoy XL, 2004-2005 Envoy XUV, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier and 2002-2004 Oldsmobile Bravada. The housing measures about 8.44 x 5.05 in and the actuator about 4.33 x 2.53 in.

On these trucks the intermediate shaft bearing wears out and the actuator fails. You see a Service 4WD light, a front axle that will not engage, a grind or clunk from the right side of the front diff, or a hum at highway speed from a dry bearing. Replacing the full housing gets you a new bearing and seal along with the actuator, so you do not have to press a bearing into the old casting. Drain the front diff first, pull the right axle shaft, and refill with gear oil after the new housing is torqued down.