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Transmission & Driveline Transmissions and Differentials

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Old Nov 8th, 05, 08:11 PM
saeger saeger is offline

Join Date: Nov 2005
Posts: 3
Default Powerglide Slipping

I have a 1968 Chevy Impala with a 307 and a Powerglide. Recently the transmission started slipping so I changed the oil. When I removed the drain plug thick black oil came out. So at this point I wondered does transmission oil become tick and black after 37 years? or were the previous owners stupid enough to put motor oil in the transmission?

After I changed the oil and the filter the slipping improved but did not go away. So now I'm wondering is the transmission shot? or is the problem something simple like tightening the band?

If the problem is a band adjustment how do I adjust it and what tools do I need?
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Old Nov 9th, 05, 01:58 PM
saeger saeger is offline

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Default Re: Powerglide Slipping

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Old Nov 9th, 05, 02:20 PM
JimM JimM is offline
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Join Date: Dec 1999
Location: Yorkville, Illinois USA
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Default Re: Powerglide Slipping

thick black trans fluid is very not normal.
I would take it to a quick lube that has a power flusher. When you drain the pan, there's still about twice that much fluid in the torque converter, gonna take some flushing to get it all out. Then keep your fingers crossed that no real damage was done.
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Old Nov 12th, 05, 09:16 AM
Oldani Motorsports Oldani Motorsports is offline
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Join Date: Feb 2003
Location: Waterloo, Iowa
Posts: 593
Default Re: Powerglide Slipping

Probably beyone a band adjustment. They are not hard to overhaul! Pull it out, and I will gladly help move you through a checkout and rebuild via here, email, or phone!
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