Gear oil for a 4 speed muncie - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 06-08-2011, 09:11 PM Thread Starter
 
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Gear oil for a 4 speed muncie

Simply put... what do I use (brand?/viscosity?/weight?) I've heard to stay away from GL5???
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post #2 of 11 (permalink) Old 06-09-2011, 09:09 AM
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Non-synthetic GL3 or GL4 75w-90 or 85w-90. Specified is straight 90 weight, but I haven't seen it in years, literally. They say the GL5 is corrosive, but I don't believe it. Still, run the dino based GL3/GL4 stuff and you'll be fine. No synthetic oil in a Muncie, though.
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post #3 of 11 (permalink) Old 06-09-2011, 03:58 PM Thread Starter
 
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Awesome. That's the info I was looking for. Any specific brand? or just go with something reputable...
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post #4 of 11 (permalink) Old 06-09-2011, 06:47 PM
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I've used Valvoline, Kendall, and even Staylube over the years. All are of a high grade. Valvoline is the one found at Kragen's or Napa, usually.
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post #5 of 11 (permalink) Old 06-09-2011, 10:11 PM
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Non-synthetic GL3 or GL4 75w-90 or 85w-90. Specified is straight 90 weight, but I haven't seen it in years, literally. They say the GL5 is corrosive, but I don't believe it. Still, run the dino based GL3/GL4 stuff and you'll be fine. No synthetic oil in a Muncie, though.
I'm running 75w-90 Amsoil synthetic in my Saginaw. Just out of curiosity, Jeff, what is it about Muncie that you can't run synthetic?



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post #6 of 11 (permalink) Old 06-10-2011, 02:28 PM
 
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Gear Oil in a 4 speed Muncie

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I'm running 75w-90 Amsoil synthetic in my Saginaw. Just out of curiosity, Jeff, what is it about Muncie that you can't run synthetic?
I am also curious why you would not suggest running synthetic in a Muncie?
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post #7 of 11 (permalink) Old 06-10-2011, 02:58 PM Thread Starter
 
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*apparently* there's an mineral additive of some sort that is abbrasive/corrosive to the brass synchros....apparently. I'm not about to find the hard way, lol.
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post #8 of 11 (permalink) Old 06-10-2011, 06:17 PM
 
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Gear Oil for a Muncie 4 speed

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*apparently* there's an mineral additive of some sort that is abbrasive/corrosive to the brass synchros....apparently. I'm not about to find the hard way, lol.
I have a local Amsoil rep with a retail store. I can ask him the next time I am in there and advise. He is a pretty knowledgeable guy. I will also post to a Corvette forum I belong to and ask the question.

I can't comment on what you have heard but I am totally sold on synthetics and have used them for years. Oils, Trans and differentials, oil filters, water wetter you name it.
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post #9 of 11 (permalink) Old 06-11-2011, 08:16 AM
 
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Gear oil for a 4 speed Muncie

Received some input on the Corvette Forum from Hib Halverson, technical writer. Hib is well known in the automotive community and is a reliable source of information. He advises that if you use a synthetic lube that meets the GL4 standard (90wt or 75W90) it will work fine in a Muncie,Redline MT90 would be one example. Hib ran the Red Line product successfully in his 71 big block Corvette. Synthtics are far and away a superior product. Hope this helps......
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post #10 of 11 (permalink) Old 06-11-2011, 11:24 AM
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I got my information on other forums...the HAMB was one, but also from Muncie parts suppliers. Also a Corvette forum. And from driving Muncies for over 30 years. I know synthetic is "better" , and I know it flows much better, and because of this, it can leak better, too. Especially if your case has a worn countershaft bushing, which 95% of them do, if original. Also, there was some disussion that it was TOO slick for the synchro rings to grab properly, resulting in grinding shifts. Google it, and you'll find that the serious "Muncie Guys" only use dino oil in their gearboxes.
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