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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Oct 29th, 05, 12:27 AM
JEFFMB JEFFMB is offline
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Default Best Gear Oil to use in a Muncie M20

Hi folks, getting ready to put in my 4 speed, it's been awhile since I've bought gear lube, whats the hot ticket nowdays for the old Muncie M20..
Thanks,
Jeff
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  #2  
Old Oct 29th, 05, 04:15 PM
12run 12run is offline
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Default Re: Best Gear Oil to use in a Muncie M20

Good old 85W90 was always good enough for me.
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  #3  
Old Oct 29th, 05, 05:57 PM
pdq67 pdq67 is offline
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Thumbs up Re: Best Gear Oil to use in a Muncie M20

Ditto!

Dark teal colored stuff should smell a lot like good old EOS!!!

pdq67
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  #4  
Old Oct 29th, 05, 06:37 PM
cortezsilver cortezsilver is offline
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Default Re: Best Gear Oil to use in a Muncie M20

If you want to go synthetic use redline 75/90NS
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  #5  
Old Oct 29th, 05, 07:28 PM
vince69 vince69 is offline
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Default Re: Best Gear Oil to use in a Muncie M20

royal purple, worth its weight in gold.
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  #6  
Old Oct 29th, 05, 08:06 PM
JodysTransmissions JodysTransmissions is offline
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Default Re: Best Gear Oil to use in a Muncie M20

Quote:
Originally Posted by 12run
Good old 85W90 was always good enough for me.
Quote:
Originally Posted by pdq67
Ditto!

Dark teal colored stuff should smell a lot like good old EOS!!!

pdq67
I also agree about the standard 85W90 lube.

As much as I like the newer fluids as stated, they will usually push out the front bearing retainer. After that, it will wind up getting on your clutch. Slip sliding away.

Some of the (an option) Autogear main drive gear/front bearing retainers use a lip seal. This will keep those light weight fluids from pushing out the front.

Regards, Jody
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  #7  
Old Oct 29th, 05, 08:30 PM
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ZZ430DropTop67RS ZZ430DropTop67RS is offline
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Default Re: Best Gear Oil to use in a Muncie M20

Quote:
Originally Posted by cortezsilver
If you want to go synthetic use redline 75/90NS
Ditto.
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  #8  
Old Jul 7th, 06, 12:17 AM
MaxR MaxR is offline
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Default Re: Best Gear Oil to use in a Muncie M20

I have a 5 gallon bucket of Royal Purple Max Gear 90. Will that work?
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  #9  
Old Jul 7th, 06, 07:01 AM
Dave69Z Dave69Z is offline
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Default Re: Best Gear Oil to use in a Muncie M20

I use valvoline 80-90w gl-5 with mt-1 spec per transmission manufacturers recomendation. It is a new autogear m-22w. Seems to work great in all temperatures.
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  #10  
Old Jul 7th, 06, 01:43 PM
Straight-line-69 Straight-line-69 is offline
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Default Re: Best Gear Oil to use in a Muncie M20

Agree,..the chief engineer (George) at Autogear says NOT to use synthetics in his Muncies,..the synchros don't work as well. He recommends Valvoline 80-90 conventional gear lube with the MT-1 sub-spec (mentioned above) which is good for the yellow parts. Other lubes such as Castrol, don't have this sub-spec.

And it's no secret syns will leak before mineral lubes as mentioned above.
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  #11  
Old Aug 30th, 07, 10:32 PM
RamJam RamJam is offline
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Question Re: Best Gear Oil to use in a Muncie M20

I know this post is old but still hoping for help. I have a Muncie M-21. I want to make sure I put the right gear oil in it. I checked at advance Auto they have Valvoline 80-90 heavy duty for $4.88 a qt. Is this what I need? If not tell me what and where to get it and price. Wal-Mart has Rotella is that any good?

I already have a bad 2nd gear sync (It pops out sometimes). Mainly when I get off the gas. I don't want it to get any worse infact I'm hoping that changing the oil will make it a little better. Also how much do they hold? I've heard 1.5 and 2.5qts which is it?

Thanks
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Last edited by RamJam; Aug 30th, 07 at 10:37 PM. Reason: adding oil question
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  #12  
Old Aug 31st, 07, 04:27 AM
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77thor 77thor is offline
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Default Re: Best Gear Oil to use in a Muncie M20

I prefer Valvoline, but it's just a personal preference....
Just be sure to get a brand name oil.

Anyone know what the fluid capacity of an M20 is??
How many quarts??
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  #13  
Old Aug 31st, 07, 08:57 AM
68zproject 68zproject is offline
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Default Re: Best Gear Oil to use in a Muncie M20

I don't remember exactly but I think it's close to 40 ozs. And MacNeish said to never use synthetic.
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  #14  
Old Aug 31st, 07, 05:55 PM
bilydean bilydean is offline
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Default Re: Best Gear Oil to use in a Muncie M20

check this out at the Chevelle site. It talks about which oil to use and why.

http://www.chevelles.com/forums/showthread.php?t=132305

Dean
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  #15  
Old Aug 31st, 07, 05:58 PM
67sprtcp 67sprtcp is offline
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Default Re: Best Gear Oil to use in a Muncie M20

I put valvoline in mine and it shifts flawless.
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