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Old 12-03-2008, 05:30 AM   #1 (permalink)
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91 GMC Sierra Replacing 4wd Acutator

4HI & 4LO do not work and appears that the actuator is bad. I will be replacing the actuator tonight.

I just want to make sure, but it looks like it just screws in the housing and then just plug in the connector.... correct????

thanks
Chris
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Old 12-03-2008, 05:48 AM   #2 (permalink)
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Don't know if this will help any:

[IMG][/IMG]

File In Section: 4 Drive Axle

Bulletin No.: 76-43-01A

Date: September, 1998

Subject:
Slow or no Engagement of Front Axle when 4WD is selected (Replace Front Axle Actuator)

Models:
1988-97 Chevrolet and GMC K Models
excluding 1988-93 Models over 8500 # GVW

This 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 (Section 4 - Drive Axle).

Condition

Some owners may comment that the colder the outside temperature is, the longer it takes for the front axle to engage when 4 wheel drive is selected, or the front axle does not engage.

Cause

The front axle engagement actuator is a thermally activated component. Because of this characteristic, the time required for the actuator to complete 4 wheel drive engagement is extended as the temperature drops.

Correction

Replace 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.
(alldatapro.com)

Last edited by USMCNetzel21; 12-03-2008 at 05:49 AM.
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Old 12-03-2008, 07:38 PM   #3 (permalink)
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The Dorman replacment actuator has 1 1/2 thread less then the stock, so I can NOT get the threads to engage.

When I match the stock one to the Dorman one they are the same in length, but the thread run out is different in the Dorman replacment.

Chris
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Old 12-04-2008, 07:48 AM   #4 (permalink)
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Maybe I am wrong on this one, could you retap/rethread it to make the new one work??? Not trying to be a smartass, just asking.
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