GM 23253658 Transfer Case Rear Case

Disconnect the cable from the negative terminal of the battery. On models with a manually shifted transfer case, put the transfer case in the 2WD High position. Raise the vehicle and support it securely on jackstands. Remove the stone shields (skid plates), if equipped. Drain the transfer case lubricant. Remove the front and rear driveshafts. Unplug all electrical connectors and detach the vent hose from the top of the transfer case, including the wiring harness retaining clips. If necessary, disconnect the transfer case vent tube. On manually shifted models, disconnect the shift linkage from the transfer case by pulling the shift linkage ball socket off the ball pivot on the transfer case shift lever. Raise the transmission enough to remove the crossmember, and support the transmission with a floor jack. If necessary, remove the transmission mount from the transmission. Support the transfer case with a jack, preferably a special jack made for this purpose, using safety chains to help steady it. Remove the transfer case adapter-to-transmission mounting nuts, noting that on some models, the fuel line bracket may be attached by these nuts. Make a final check that all wires and hoses have been disconnected from the transfer case, then move the transfer case and jack toward the rear of the vehicle until it's clear of the transmission, keeping the transfer case level. Once the input shaft is clear, rotate the transfer case as necessary, lower it, and remove it from under the vehicle. Remove the adapter-to-transfer case bolts and the adapter as needed. Before installation of the transfer case and adapter to the transmission, apply lubricant to the splines on transmission/transfer case combinations where the input shaft is dry. Installation is the reverse of removal, replacing the gasket with a new one and ensuring to tighten the transmission-to-transfer case nuts to the specified torque. On manually shifted models, adjust the transfer case shift linkage accordingly.

During disassembly, it is crucial to take careful notes on the arrangement and installation of each piece, as this will facilitate the reassembly process.

After removing those components, you should raise the transmission enough to remove the crossmember, support the transfer case with a jack, and remove the transfer case mounting nuts.

Next, you should remove the front and rear driveshafts, unplug all electrical connectors, detach the vent hose from the top of the transfer case, and disconnect the shift linkage (if applicable).