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Old 07-27-2011, 12:17 PM   #1
bluesfella
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What's the right lubricant for a stock 3-speed transmission?

I just replaced the clutch and refilled the transmission with 90w gear oil. It wasn't until after I drove it to work today that I realized that I hadn't actually checked the proper lube to use! I'm at work with no access to my manuals, and I want to pick up the correct stuff today and change it out tonight. Does anyone know off the top of your head?

Thanks!
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Old 07-27-2011, 02:03 PM   #2
61_FL_Apache
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Re: What's the right lubricant for a stock 3-speed transmission?

This thread should answer that.

http://67-72chevytrucks.com/vboard/s...d.php?t=306492
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Old 07-27-2011, 02:59 PM   #3
66K10383
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Re: What's the right lubricant for a stock 3-speed transmission?

I cant find straight 90w these days. im 99% sure thats what the tranny called for. in my SM420 original tranny I used NAPA 85-90w, same as the front and rear differential. My tranny made the same noise you describe, I changed the oil/metalic paint and it still makes the same noise. Honestly im not worried, these trannys are beasts
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Old 07-27-2011, 05:08 PM   #4
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Re: What's the right lubricant for a stock 3-speed transmission?

OK, thanks for the help guys!!
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