4x4. What is the A.I.R. relay (mark eng) in the fuse/relay block..mine is missing. Does it effect tranny shifting?

FUSES/FUSE RELAY BLOCKS OR SHIFT MOTOR.. LOOK FOR BLOWN FUSES/ AND THEN FIND OUT WHICH RELAY BLOCK CONTRLS THE 4X4 AND THEN IF THEY ARE ALL FIND? THEN GET ANTOHER SHIFT MOTOR.

that should be a 700R4. probably a broken sunshell inside the tranny. need to have it rebuilt. Mine only cost 250 bucks for the parts, but the tranny guy is family.

the motor to your transfer case, yes it has its own is going out. just happened to mine, about a $600 fix

tranny problem,try to reset.

These are very sensitive to the adjustment of the throttle position cable that goes from the carb linkage, or throttle position linkage. Make sure that is set correctly. If it is set correctly and it still doesn't work correctly take it to a good transmission shop on the 700R4. Had to have mine done 4 times and it still isn't totally right. Mine is behind a strong Mark IV big block.

ENG 1 - 20 amp fuse - under hood fuse Box . This fuse powers the O2 sensors heater circuits , Emission - purge an vent solenoids , mass air flow sensor , camshaft position sensor an A.I.R. intake recirculation relay - if your vehicle has it , L31 only
I would look for wires for o2 sensor melted on a exhaust pipe or manifold . Isn't your check engine light on ?

Something you might find handy is a signal tracer (about $40) which can be used in the home or auto. It has 2 components and creates a signal into the wire which allows you to follow that signal down the wire to find the break. (Lowes, Home Depot) Has connectors for fuse panel holders.

You do not want to directly jump 12 volts into the shift motor. The voltage the shift motor receives determines the length the solenoid extends to give you different functions. The 4x4 selector changes the voltage for each function. ONE thing you can check is the light bulb for the 4x4 selector knob. There have been reports on this site that a burned out light bulb can change the voltage for the 4x4 selector. Myself, it seems strange because the lightbulb is off until the headlights, etc. are turned on, so it would make no sense to effect the 4x4 selector during daylight.

Since you have a duplicate shift solenoid you may be able to plug in the wiring harness and ground the extra shift solenoid to aid in diagnosing the problem.

You could loosen up the fuse box holding these particular wires and check them on their backsides. Also check to see if there is a shift selector relay.

Listen for the TCCM (transfer case control module) to "click" when 4X4 is activated behind passenger kicker panel just in front of passenger door near floorboard. If it clicks then is activating and with the new motor on transfer case that would make me think it has something to do with the 4X4 vacuum lines. If you look under the battery tray you will find the vacuum canister that activates the front hub when 4X4 is activated. take out ur battery and position it so you can still have it hooked up or with jumper cables and still see the canister and turn your truck on and engage 4X4 to see if vacuum canister activates to lock in front hub, if not just follow and check vacuum lines. Also check, ALL, fuses as there are many fuses that in my opinion are miss marked as with the logic side of TCCM is ran through the fuse marked for the Dome Light. Have also heard of parking lamps having something to do with it too... just a few suggestions from things I had to go through with mine

Hi ..i had the same same problem in my k3500,check 4x4 fuse first .if thats blown replace it if blows when you put in 4x4 go under the car and unplug the actuator at the front diff.go back in the cab and put another fuse in, shift into 4x4 if the fuse does not blow this time you will need a new actuator.
thats what happened with mine and now 4x4 is sweet.i thought mine worked to at the start until i got bogged and noticed my front wheels wernt turning.

i have heard that the ignition switch can be faulty and not let the full voltage thru to the electricaly controlled 4l60e trans.i have the same problem with my 95 1/2 t. i rigged a switched wire from the fuse block via a relay to the proper wire on the trans....ask a trany tech and they will know what im talking about,,,good luck