Question about 1992 GMC Sierra K1500

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I have a 1992 GMC Sierra with a 5.7 motor. When

I have a 1992 GMC Sierra with a 5.7 motor. I can start the truck and drive it for about 5 miles with no problems but when the truck warms up the transmission will start to slip and not want to pull in both the forward and reverse gears. Can anyone tell me what is wrong? Do I need to replace the transmission? Thanks, Rob

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  • user42crzy28 Jun 18, 2009

    I would like to add that when the transmission starts to slip I can smell an odor that is similar to the heater core going out but the heater core is fine. Thanks, Rob

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  • GMC Master
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It sounds to me like your transmission is not well. It's working when the fluid is cold but not as it warms up. Pull the dipstick and check your transmission fluid for color and smell. It should be pinkish and smell like oil. My guess is that it will be closer to brown than pink and have a burnt oil smell to it. It the transmission is full, check the level with the trans warm,engine running, in neutral.I'd be shopping for another transmission. If the fluid is below the add mark, you an usually buy yourself some time on the replacement by changing the trans fluid and filter.At the same time add a transmission treatment with the new oil,I've had good luck with Lucas. Hope this helps.








Posted on Jun 18, 2009

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