1989 Chevy Truck (ck 2500)

1989 CHEVROLET TRUCK
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OMAHAN
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I have a 89 chevy truck 4x4 CK2500. When I engage the 4 weel drive the front weels will not spin. I supposed to have an automatic locking system but don`t work. Does anybody out there knows how to fix this problem? Should I install the mechanical hubs on it?
Jan 11, 2006 at 12:54 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Identify the truck's installed four-wheel-drive system and have its command circuit, actuator and mechanical engagement tested before selecting repairs or conversions.

Guidance references and applicability

Source: This question and its visible discussion, including any clearly labeled editorial corrections. Owner reports are distinguished from other participants' experiences. Follow-up guidance is not a confirmed diagnosis.

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AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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2CARPRO JACK
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IFS 4x4s have a diff actuator in the front diff, GM had some problems with it
Jan 11, 2006 at 7:19 AM
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CADIEMAN
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ck for vacuum at the servo.if u push the servo in does the front hubs lock?
May 18, 2012 at 12:43 AM
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GUZZ747
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Read mileage wrong its 73500
Jun 3, 2012 at 2:13 PM
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CADIEMAN
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have u checked the servo yet
Jun 3, 2012 at 3:54 PM
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JAMES HUMPHREYS
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Please help me someone is this an expensive fix
Jul 12, 2012 at 5:28 PM
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CADIEMAN
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2CarPros editorial correction - October 12, 2026

The earlier vacuum-servo description and instruction to hold an actuator cable with locking pliers have been withdrawn. They were not verified for this truck. Identify the installed four-wheel-drive system and have its engagement command, actuator and mechanical operation tested using matching service information. Do not improvise a clamped engagement mechanism or assume that another truck's system applies. No failed component or completed repair was confirmed here.
Aug 7, 2012 at 9:24 PM
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Discussion summary

1989 Chevy Truck (ck 2500)

A 1989 Chevrolet CK2500 reportedly did not drive its front wheels when four-wheel drive was selected. Replies discussed an axle actuator, but later advice described an unverified system from another vehicle.

Reported outcome: No confirmed failed component or repair was reported.

The cable-clamping workaround was withdrawn. The discussion did not establish that manual hubs or the described vacuum-servo system applied to this truck.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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