some questions
Your 4WD most likely has a shift-on-the-fly electronically shifted transfer case. If you are extremely fortunate, the T-case is a manually shifted model. Either way you have three possible configurations: 2WD high, 4WD high, and 4WD low. Pushing the 4WD button (or shifting the lever) will engage the front axle and allow additional traction in wet, muddy, snowy, etc. conditions. Don't assume 4WD will be any good on ice. Ice just isn't nice... end of story. It is recommended that you avoid use of 4WD on dry pavement for any great distance as it puts undue stress on certain components. Shifting to 4WD high can be done at most legal speeds but I personally don't even try to engage it at anything over about 35 MPH. For even greater traction and added pulling power the 4WD low setting can be selected but the truck must be at a dead stop or less than I think it's 3 mph. However the speed is a moot point as the transmission should be in neutral when you engage 4WD low. This setting (4WD low) is reserved usually for extreme circumstances and strictly off-road driving. As with anything, there are exceptions to any rule.
This is a bit backwards but I realized that I missed an important point. If your truck has automatic front wheel hubs, the aforementioned should be all that is required to engage either 4WD configuration. However, if the front wheel hubs are manual, there will be a dial at the center of the hub on each front wheel that will need to be rotated to the "lock" position before engaging the transfer case. Engaging the T-case without locking the hubs will not harm the system but it will not transfer the power from the front axle to the front wheels. (So, no 4WD).
To disengage the 4WD either shift out of 4WD or press the 4WD button again. With automatic hubs, you will need to back up about 10-15 feet to disangage the hubs once the transfer case is disengaged. To disengage with manual hubs, do the same as above but to disengage the front wheels from the front axle you will need to get out and rotate the dial on each hub to the "free" or "unlocked" position. If you forget to disengage the front manual hubs, it will not harm the system but you will see the difference in your fuel mileage as you will be forcing all of the front driveline to continue to spin because it is still "locked" to the wheels and in turn they will spin the driveline. The additional drag put on the engine will be noticable in fuel mileage.
Good luck with the truck!
Last edited by greystreak92; Jan 15, 2005 at 11:29 PM.
Last edited by greystreak92; Jan 16, 2005 at 05:34 PM.








