Question about GMC Sierra 1500

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I have a 1992 GMC Sierra 4X4 1/2 ton. 280,000 km. it runs great and is in extremety good condition and the transmission works fine, except it has started blowing fluid through the overflow tube. When hot the dipstick is showing over filled and frothy. Does it need to be flushed and changed or is this someting more severe. I would apperciate your input Thanks, Karl

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Anytime you have your oil that becomes frothy and grey in colour your looking at a coolant leak more than likely your heads are leaking into your oil, One test is that your exhaust will be a about the same colour as your breath in the winter all the time. Head gaskets are cheep enough but to get the work done will cost a few hundred more $400 to $800. Sorry its not good news but I hope it helps.


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your highway acceleration problem could be a coil problem. Not sure if that year of chev has coil packs or not but experienced same thing with ford 5.4L. went through 3 coil packs and did the same thing each time before biting the dust. Transmission seems to be sticking on the 1to2 upshift and could be a sticking solenoid in the valve body of the tranny. If the shifting problem persists then the tranny deffinately has to be rebuilt. It's made it quite far if tha is the original tranny, you cant expect too much life out of it if it has been worked hard. I highly doubt a fluid change would help at all. Or if you want, you can buy a can of new truck from GM for about 25 to 35 thousand bucks! Typically works great!

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