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Topic: 4 speed Muncie oil change

in Forum: C3 Driveline Components

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4 speed Muncie oil change (1/4)
2/6/14 7:39pm

rep69
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Suffolk, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 137

I have never changed oil in a muncie before. How hard is it? Trying to do some researc, some have drain plugs, some do not. I have owned the car for a couple of years, do not know if or when the oil was last changed. Before I had the engine out for overhaul, it shifted fine and no unusual noises. Use GL-4 rated 80/90w oil? Thanks, Bob

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Re: 4 speed Muncie oil change (2/4)
2/6/14 8:12pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20203

You are correct that not all Muncie/BW have drain plugs...some do, some don't. However, if yours does NOT have a drain plug, you can still drain the gear lube, by removing the very bottom bolt in the tailhousing, where it bolts up to the main case of the trans. It'll work best if the trans and fluid are hot.

Regular 75/90 weight gear lube(GL4) is fine.

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Re: 4 speed Muncie oil change (3/4)
2/6/14 9:12pm

rep69
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Suffolk, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 137

Thanks for the info and pic. This is very helpful.

Re: 4 speed Muncie oil change (4/4)
2/8/14 5:42pm

tom43xy
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Littleton, CO - USA

Vette(s):
76 corvette, L-48, Flame Red

Joined: 2/5/2006
Posts: 50

I recently rebuilt my muncie and had to replace the case. Neither the 704 or 325 case have an opening in the casting to this bottom tailhousing bolt. You might be able to drain the tailhousing, but don't see how you could get much fluid out of the maincase. Best method without a drain plug would be to use a suction gun I think. Unfortunately, that might not get rid of any gunk or debris in the bottom, but it might be rebuild time in that situation.

Maybe the later maincase castings have this opening you refer to. I rebuilt one of those a long time ago, but sold that car.

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