Question about 1997 GMC Sierra

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After running my 97 GMC Auto /4wd for a few minutes, pressure will build up. Fluid will leak from the fill tube. When the dipstick is removed, fluid will gush out. I have asked, and looked everywhere I could think but no one seems to have heard of this problem. Can you help?

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  • Eric Johnson May 20, 2011

    It has 200k. I noticed after using 4wd for several miles during the snow last winter. There was a pool of fluid under the trans, I took out the dipstick and fluid poured out. A few months ago, I drained the trans, not noticing any debris, replaced filter, refilled, and it shifted fine. 4w worked too. As it idled, i took out the dipstick, and it did not flow out. After driving it back home, about 1 mile, I turned off the truck and checked the dipstick once more. It shot out once again. Any suggestion as far as cost of rebuilt vs. repairing this one? Thank You. -eric


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Ther is most likely an internal leak inside the trans, possibly due to a defective seal in the hydraulics circuit. I would recommend draining the fluid into a clean container and inspect the fluid for debris or contamination. How many miles are on the GMC? Was the transmission ever serviced and when? Is the correct fluid level obtained?

Posted on May 20, 2011

  • GetMeOttaHere May 20, 2011

    Is it possible that the trans cooler is clogged? Something is building pressure internally and for the fluid to travel all the way to the top of the dipstick tube will require great pressure. I would be curious to see if the trans cooler was disconnected and by-passed, would this condition still occur. As for a replacement or rebuild your existing one, the norm now a days is to swap out the transmission with a rebuild and give your old one as a core. Keep in mind, the vehicle does have 200k, and if this repair was performed,the next valid question to ask is what else may fail or cause other issues. In short, if you feel the vehicle is worth it, then perform the swap. Transmissions are not that difficult for the professional, but are very time consuming and require a battery of special tools to tare down and re-assemble.


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