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Old 02-03-2016, 12:06 PM   #11
Ol Blue K20
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Join Date: Nov 2012
Location: Vacaville , CA
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Re: New to me: 1978 GMC High Sierra c25

I would clean the trans really good with brake clean. Let it sit a couple of days and let the torque converter drain down. It will fill the pan and you should be able to see where it's leaking.
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