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The transfer case has the vacuum switch on top of it. That switch turns on the cad axle.
I had found the transfer case filter/breather behind the valve cover and it was pluged. It is for the transfer case but [/COLOR]it is wye into that vacuum switch. It must alow vacuum/pressure to vent when the switch cycles. May prevent the switch from fully opening or closing?
I ran no filter for 1 week, then bought a small 1/4" fuel filter from NAPA for $3
test procedure: vacuum pump working? - heater controls ok? vacuum going to tcase switch? vacuum comming out the 2 lines from tcase switch? my guess is 1 for cad engaged (4x4) and the other for 4x2. Good connection to test is above the skid pan, I saw rubber boots. TEST SWITCH. then if ok move to front axle, test lines. test cad.
If the cad moves it will turn on the 4x4 light. Do you have a light? Test the light with a jumper in the plug, because many have had broken wires & NO LIGHT. Must Confirm a working light.
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2001 2500 QC SLT Laramie 4x4, 239k, camper/tow package, NV4500 5 sp, 3.55 dana 60/80 anti spin, drum brakes, Jan 00 build.
4" banks, blue chip XS vp44, Smarty Revo, 275RV injectors, isspro egt,fuel,boost & air gauges, South bend con OFE, FASS, Blizzard plow, 2 Hadley bully air horns.
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