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Discussion Starter · #1 ·
Hey all,
Cars out for the season and need to change the fluid in the M-21.
Where is the drain plug and what is the best stuff to use? How much fluid goes in and how do you tell the level?? I assume I need a lift to do it which I have access to in my buddy's shoppe.
Good to be back as had to go on internet detox, it was getting out of control! LOL!
BB Dave: Don't even start! Haha!

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JARRET GRATHWOL
TEAM CHEVELLE MEMBER #573
1970 Chevelle SS 396/ M-21
You can see my Chevelle SS here:
http://www.geocities.com/stangsvt99/Jarret_s__70_Chevelle_SS.html
 

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Welcome back.

Try redline synthetic. As for a drain plug, don't be suprised it there isn't one. As for fill level, just keep pumping until it starts pouring out the fill hole, then install the plug as quickly as you can.

Steve R.
 

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Discussion Starter · #5 ·
No plug? How does it spill out for fill knowledge if it has no plug?? Hehe.
Thanx all
 
G

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You put synthetic oil in a Muncie and you won't be able to shift it. Use only 80/90 regular gear lube in a Muncie. There is no drain plug on early units unless someone added it or it is a M22 case. The later, 1970 to 1974 units had drain plugs.

Use a small pump to remove the old oil. Do it after the trans is warm. It is full when the new oil trickles out of the filler in the side.



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Wally
www.muncie4speed.com
Gold #67
2001 Chevy Silverado LT
67 Malibu "Small Block" second owner
90 SS454
71 Malibu "Small Block"
 

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Is that the REAL J-Man, or someone posing as him?
 

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I use Kendall 80-90 SAE. Its fine. For colder weather folks say the synth is freer, but issue is somewhat academic for us.
 

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Discussion Starter · #12 ·
Actually, it's not the real J-man, just a hologram of him! Hehe.
Thanx guys, now I'm out to get some non- synthetic- I never put much stock in that stuff anyways, nuttin but leaks and hassles in my experience.
 
G

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The design of the Muncie is the issue here. The synthetic oils are to slick to allow the syncros to operate correctly. I know it sounds strange but it is true.

Synthetic oils are fine for the motor and the rear, just not a Muncie.



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Wally
www.muncie4speed.com
Gold #67
2001 Chevy Silverado LT
67 Malibu "Small Block" second owner
90 SS454
71 Malibu "Small Block"
 
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