I have a Muncie M20. I have it out of the car to paint it and change clutch. In the process it's been tilted here and there and leaked a little oil out the back spline. how do I check the oil level and where do I fill it?
What is the recommended oil to use?

Thanks
Ray

Ray,
There is a fill plug about half way up the case on the side away from the shift levers. Take the plug out, stick your finger in and see if you can feel any fluid. It should be at the level of the bottom of the hole. I have always just filled them until it just starts to run out of the fill hole, then put the plug in.
Hope this helps,

Also,..there's no drain plug on M-20's so if you wish to replace the gear oil, you'll need to pump it out. Chevy did a lot of things right, but this isn't one of them.

Thanks guys,

I found the fill plug. definitely is low!
Any favorite brand of oil to use?

Ray

any quality 80-90 wt gear lube will do fine, Ray.

Mine always leaked out the front if I filled it all the way.
Just enough to put some oil on the tip of your pinky when you stick it all the way in the hole always worked pretty good for me.

Thanks JimM

I will pick up some Valvoline at the AutoZone today and fill and check before I put it back in.

Thanks
Ray

Ray, you may want to wait and fill the trans with new oil after it is installed. If you fill it, with the trans being level, oil is just going to drain out again as you handle it.

When you do fill it and if you decide to refill with it in the car, fill it from the inside, as through the boot. Gravity works wonders. I use a 3/8-1/2 inch clear vinyl hose, something to slip over the gear oil top tip, and fill it from inside the car. Drain pan underneath to catch overfill.

IMO, you may decide not to paint the alum case of the Muncie. Alum in its natural state, dissipates heat the quickest. If I were going to "coat" the trans, I'd use used engine oil and a rag and wipe down the trans.

Thanks Everett#2390

Makes sense to wait to fill as suggested. I'm sure I will not keep it level during the install.

On the paint, unfortunately I already have it painted with Aluma-Blast from Eastwood. Most of my drives are fairly short distances. To town and back ( 3 miles ) and short country drives for now. Hopefully heat will not be a problem.

Thanks
Ray

Autogear recommends Valvoline 80-90 which has a sub-spec of MT-1 which they believe to be good for the the Muncie's small parts.

I use a 4-5' long 3/8" fuel hose and let gravity do it's thing while I hold the quart in the engine bay,..I usually spill a drop or two and doing it from the interior could make a mess.

Fyi...

I use a cheapo plastic pump (from underneath) made for this type of thing that screws onto the bottle. I just go kind of slow when you get close to filling it up so that fluid doesn't come hosing out.

Or use a $5.00 lube sucker from good old HFT!!

It's like a "grease-gun" w/o the pump handle!

I can't believe I went ALL these years w/o onna the darn things!!