Thats in the transfer case..did you get the linkage rods put in ok or did they bind up on reinstall..I had a suburban 4wd.. its basically the same..if its stuck in4w low..put the main transmission in neutral and work the transfer case shifter back and forth between all of its selections for a bit..these get hard to shift if they arent used much..also most of the time the vehicle needs to be rolling slowly to shift it..you will feel it shift in speeds under 5mph..good luck..
SOURCE: Will not shift into 4wd low but will shift into 4wd high
Thanks for your response johnnyc85.... I did some searching on the internet and found it. When you need to go into 4wd low, just turn your knob to the 4wd low position and when it starts to blink just put the truck into drive or reverse and move about 1mph it will lock right it. It takes about 5 seconds to engage.
SOURCE: Ford F150 front tires won't engage in 4 wheel drive
look on fire wall pass. side you will see 2 parts with vacume lines attached 99 percent of the time that is what went i had the same problem
SOURCE: 1999 Chevy Silverado 4x4, transfercase will not kick out of 4x4
sounds like the punch solinoid in the front diff
SOURCE: 2004 ford f150 4 wheel high will not engage 4 low
Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.
- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.
Here is a block diagram of the IWE system
SOURCE: 2002 GMC envoy slt 4.2
Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.
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