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99 GMC K 1500 Transmission burning fluid and comeing out blow-by

I have a 99 GMC K1500 with 200k miles. When I bought the truck it had 125k miles on it. I replaced the trans filter and changed the fluid the 2nd day I had it just to make sure it was done. At 165K miles I had the trans flushed. They said the fluid was pretty burnt at that time, but no shifting problems. Now at 200k miles I noticed it sliping and fluid coming out the blow-by. Is it possible a flush and new filter would take care of this? I am wondering if a cooling line could be pluged. Or with this many miles, would I be better off sticking a new Transmission in? Please advise.

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The fluid boiling over is caused by the slippage heating up the fluid, your clutch pack is worn out, you will need an overhaul.

Posted on Nov 07, 2008

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Posted on Jan 02, 2017

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