Our 94 chev blazeer k5 (fullsize) man trans goes into 4h and 4l but seems to have a jumping transfercase chain as it underload (driving) will make a skipping or slapping noise from the transfer case espicially when turning,how do I determine if it is in fact the transfercase.
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the samurai doesn't have 2L it has 2H. there are 4 modes on the transfercase. 2H, 4H, N and 4L. 2H engages the rear wheels only while 4H and 4L engages all 4 wheels. N disengages all 4 wheels, useful for flat towing.
I have a 93 full size blazer and might be able to help. First you need to ensure that your are actually not engaging the hubs. To do this, shift into 4H or 4L and try to turn very sharply. If it is difficult to move forward with the wheel turned all the way, you are probably in 4WD and the indicator light may be out.
If the truck drives as it does in 2H, your front diff is not engaging. If this is the case, there is a thermostatically engaged actuator that may have failed. These fail occasionally and can be purchased at most auto part stores or at the dealership. Before you buy a new one, use a voltmemter to ensure that voltage is present at the actuator when you engage 4H or 4L.
I know several companies make a manual pull cable style activator that can replace the thermostatically engaged unit.
Lost more info here: http://www.automotiveforums.com/t173603.html
Look for damaged wires, or something bent, on the Auto Disconnect Device on the front axle before you do anything else. The 4WD HI light is not coming on because the front diff is not engaging.
Re 4 LO: In 4 LO, you ar NOT getting "4 LO", what you are really getting 2WD LO, because of the output gearing of the transfer case.
In any case, your front diff is not locking in, in either mode. The A.D.D. controls the 4 Hi lite.