Top 10 1989 GMC Sierra Questions & Answers

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what transmission will fit in an 89 gmc sierra?

I need to replace a transmission in an 89 GMC Sierra. I am looking for one at a junk yard. What other years/models will work in this truck? Thanks.

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if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

Posted on Nov 20, 2008

Question

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ANTIFREEZE DISAPPEARING - NO VISIBLE LEAKS

ANTIFREEZE DISAPPEARING - NO VISIBLE LEAKS

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HI. This issue has many causes. i will list the most common causes below.

Coolant consumption::: Possible causes______


1. Check the head gaskets. The gasket may be leaking.
2. Check The Intake Manifold Gasket. This gasket may be leaking, worn, or damaged
3. Check the cylinder head for worn or scorn cylinder block.(This will require total breakdown of the engine)

4. Check the water pump seal for leaks as well.

Now that we have covered the basic check points for coolant consumption, i would advise to concentrate on the head gaskets if there are no apparent leaks on or around the engine itself. If the head gaskets are worn, the leak can be introduced to the engine internally, causing the engine to burn off the coolant. this is noticeable by removing the oil cap, after a hard drive. you Will notice steam that will escape the head as soon as you remove the cap. If this is the case, your problem will be with a failed head gasket.

IN a severe case, you will notice white plums of smoke escaping from the tail pipe during acceleration.

Posted on Jan 04, 2010

Question

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4 wheel drive will not engage on my 1989 gmc

4 wheel drive will not engage on my 1989 gmc sierra 2500?

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actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Posted on Feb 08, 2010

Question

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How do i clear the "service engine soon"

How do i clear the ''service engine soon'' on my 1988 gmc sierra 1500 with a 350 in it.

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Disconnect the battery for a minuit and turn on the light's to power down any electrical power. Reconnect the battery and that should clear the "servie engine light soon",but if there are any DTC codes, the "Service engine light" will come back on.
On board diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check the Engine Light. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports.

For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.

the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.

Good luck and hope this help, here is a link to the DTC codes. http://www.gmtuners.com/OBD1_DTC.htm

Posted on May 08, 2009

Question

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how to replace a brake light switch for a 1989

how to replace a brake light switch for a 1989 sierra gmc 1500 pick up truck

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Look up under dash where brake pedal pivots, you should see a switch that is activated by pedal arm.

Posted on Mar 07, 2009

Question

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can i turn the flywheel that connects to the starter by hand

my 89 gmc c 1500 will not turn over. i put new starter in and everything and now im wondering if i can turn the flywheel that connects to the starter by hand so that i can know if something is seized up in there? i can now hear the starter clicking which is a huge improvement.

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You can take out the spark plugs and turn the motor over by the frt at the bolt that holds the harmonic balancer(or lower pulley),with the plugs out it should turn over pretty easy.

Posted on Mar 29, 2009

Question

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How to replace the thermostat on a 1989 GMC Sierra

How do you replace the thermostat on a 1989 GMC Sierra? I have this beast of a truck that needs the thermostat replaced. This truck has the V8 5.7L engine with a carburetor. I've never done anything like this before, but with a good explanation (and maybe pictures) I feel that I could probably do it. Anyone willing to help a gal out?

Thanks.

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Drain the coolant (left lower side of the radiator) Follow the upper radiator hose to the engine, at the end of the hose is a metal housing, held down with 2 bolts, or 1 bolt and 1 stud. There may be wires going to one of the bolts, be sure these go back on. After taking the 2 bolts out, lift up the housing and the thermostat will be right there. Clean the old gasket from the manifold and the water outlet housing. Now install the thermostat, then the gasket. and torque down the bolts evenly. about 25-30 ft pounds. fill the radiator until about 2 inches below the filler neck, and start the engine, now keep putting coolant in to keep it 2 inches below the radiator neck, and let it warm up until you see coolant moving in the radiator, now fill it to the top and fill the coolant bottle to the cold mark. Its a good time to replace the radiator cap also. Good Luck.

Posted on Jan 28, 2010

Question

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What year/model transmissions will fit a 1989 GMC

What year/model transmissions will fit a 1989 GMC sierra, 2500, 350 engine, 2-wheel drive? Thanks

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A.T., VIN model "C" (4x2), TH400, 6 cyl
A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-305 (5.0L)
}A}}400}466495" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-350 (5.7L)
}A}}400}466496" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-379 (6.2L, diesel)
E>}B}}400}466497" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH700, diesel
A.T., VIN model "K" (4x4), TH400, 6 cyl
B@}}}400}466499" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH400, 8 cyl, diesel
A.T., VIN model "K" (4x4), TH400, 8 cyl, gasoline
A.T., VIN model "K" (4x4), TH700, diesel
FFC}B}}400}466502" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "C"
FFC}A}}400}466503" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "R"
ECB}B}}400}466504" type="radio" name="userInterchange" />M.T., 4 spd, 4x4, (VIN model "K")
M.T., 5 spd, 4x2
M.T., 5 spd, 4x4
A.T., VIN model "C" (4x2), TH700, gasoline
F=A}B}}400}466508" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH700, gasoline
}B}}400}466509" type="radio" name="userInterchange" />A.T., VIN model "R" (4x2)

Posted on Jan 18, 2011

Question

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89 GMC 3500 with 7.4L... Running Rich

I just purchased an 89 GMC 3500 with 7.4L... The engine runs extremely rich. someone has installed headers, I don't see an O2 sensor. could this be the problem? were is the wiring harness for the O2 sensor if I was to install one?

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It Should be located some where on the driver side in the wiring harness maybe tucked back in or some one could have cut the wire

Posted on May 07, 2009

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where are the fuse boxes located on a 1989 gmc

where are the fuse boxes located on a 1989 gmc sierra 1500 full size pick up?

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Answer

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there is one under the hood the other is tucked up under the dash or behined a panel on the side of the dash with door open.

Posted on Aug 16, 2009

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