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There should be a hole in the transmission case on the passenger side of the trans towards the front and just behind the governor. This is where the dip stick for the trans is usually located. The dip stick tube goes in the hole and is attached to the bellhousing by one of the bolts. There should be a rubber "o" ring around the tube where it goes in the case to seal it also. -Ed
Crud,
The 351M holds motor oil. I put 10-40W in mine.
Your C-6 or FMX automatic transmission holds Type F and Dextron III respectively.
The dipstick for said trannies is found at the fire wall on the passenger side of the vehicle. It looks like a "Dip Stick"!
A manual tranny does not have a dipstick. It has a fill plug. The drain plug is on the bottom and the fill plug is on the side of the tranny. Remove the plug and pour 80W gear oil in until it drips out the fill hole. Then replace the plug. This can be quite difficult. I use a hose and feed it down from the shifter boot. Be careful, it makes a hell of a mess if you spill.
Good luck,
KingFisher
For what it's worth, a few manual trannies DO have a dipstick. It's a great idea. I seem to recall the manual trans SAAB's in the late 70's -- all except my turbo, which had a big exhaust manifold in the way, so I had to make do with a hard to reach G%!$! plug!
Too bad more rigs aren't set up like this. Right now, Dad is having a H*#$! of a time with my '56 Cornbinder, because the plug in the side of the four speed won't come out. He ended up pulling the cover of this toploader and just pouring in gear oil. A dipstick with tube big enough to use as filler -- just like a typical auto trans -- would be great. Heck, on my old beater, I wouldn't even care if it was in the floor of the cab.