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1600 Transmission again

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Bruce Wieskus
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Joined: 07 Jan 2013
Posts: 5

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PostPosted: Tue Jan 08, 2013 6:13 pm    Post subject: 1600 Transmission again Reply to specific post Reply with quote

Ok, I think I got all the crud out of my transmission, Now that I fill it with SAE 90 weight oil, what the heck is the difference between GL-4 and GL-1? Do you dare try to mix the two together? I put in some GL-4 already. I live in SW Minnesota if it makes a difference. Do I need a oil additive at all? The owners manual says no but that was in 1962.
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ollie gm

Joined: 29 Jan 2010
Posts: 281

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PostPosted: Tue Jan 08, 2013 6:35 pm    Post subject: Re: 1600 Transmission again Reply to specific post Reply with quote

Stick with the GL-4 oil as it is rated for heavy duty hypoid gear use. It includes several friction modifiers.

GL-1 is for straight cut gears, worm gears and light duty.
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