I have 1994 Chevrolet K1500 and the Four Wheel drive will not engage. Replaced the actuator and still nothing. 4WD High there is nothing working and when I put it in 4W Low it starts grinding and not engaging , So I STOP trying to engage. Could it be my transfer case or what. Thanks.
Year : 1994Make : ChevroletModel : K1500Engine : 350
do you have the mechanical shifter in the floor for the 4wd?what actuator did you replace?
Shifter is in the floor and I replaced the actuator that screws in the front axle.
where does the grinding come from..the front or the transfer case
Not sure. Took it to a friends lift and raised the truck. The first time I put it 4w low, the front shaft turned, but not the wheels. When I tried it the next time was when it was grinding like it was not engaging and I took out 4w low to stop the noise.
did you replace the actuator with the recommended electric motor type or did you use the stack thermal one?
It was a screw in type. It was a 5 pin connector , Napa part FWD32 . It was a large black plastic switch. Not a electric motor.
if you didn't run a new wiring harness..you may have replaced it with the stock type thermal actuator...you need to replace it with the electric motor type
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File In Section: 4 Drive AxleBulletin No.: 76-43-01ADate: September, 1998Subject:Slow or no Engagement of Front Axle when 4WD is selected (Replace Front Axle Actuator)Models:1988-97 Chevrolet and GMC K Modelsexcluding 1988-93 Models over 8500 # XXXXXThis bulletin is being revised to add information to the Service Procedure, add a new part number, and include schematics. Please discard Corporate Bulletin Number 76-43-01 (SectionXXXXXAxle).ConditionSome owners may comment that the colder the outside temperature is, the longer it takes for the front axle to engage whenXXXXXis selected, or the front axle does not engage.CauseThe front axle engagement actuator is a thermally activated component. Because of this characteristic, the time required for the actuator to completeXXXXXengagement is extended as the temperature drops.CorrectionReplace the front axle actuator and include the applicable wiring harness kit. Refer to the Parts Information in order to determine which wiring harness kit is needed.1996 model trucks with a build date on or after January 2, 1996 are considered as "961". If the build date of the truck is unknown, verify the 3 character "axle code" on the front axle label in order to determine which wire harness to order.This new actuator uses a motor to engage the front axle and is not affected by temperature. On 1988-93 models with a GVW rating over 8500$, the new actuator cannot be installed and the thermal actuator will remain the service part.
Parts are currently available from GMSPO.
If binding occurs before the actuator is seated, remove the actuator and reseat the spacer by pushing on the spacer with a screwdriver. Then reinstall the actuator.On K3 Models with the cast iron axle tube, there may be a casting burr which may contact the edge of the actuator. This should not create a concern and the actuator should seat against the axle tube. If this contact remains a concern, use a die grinder in order to remove the burr.
The new Fast Axle Actuator requires only 1 splice.
Connections must be water tight in order to prevent water from entering the circuit and causing damage to the components.
This relay incorporates a 5 second delay for the front axle to engage in order to allow the transfer case synchronizer to energize.For 88-93 vehicles, if the axle has to be replaced, use jumper harness P/N 15313272. CKT 1695 (BLK/WHT) fits into cavity A of the fast actuator. The circuit includes the cable seal and the terminal pin. This circuit plugs into the 5-pin axle actuator connector.
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