While changing fluids I noticed that no socket(3/8,1/2,1/4) would fit drain plug, Then, on MAC's parts I saw a rear special tool used to suction fluid,I was told to grind a 3/8 down to fit plug is this correct or is that plug not to be removed

 

I assume it is the original 9" rear end. If so, you certainly can remove the plug, that is how you put fluid in the rear. It should be close to a 3/8".

 

Use whatever fits from your toolbox. I've used a big flat-bladed screwdriver with a small crescent wrench on the square shank.

 

Let me clarify, the drain plug not the fill plug, yeah, I didn't know if it is suppose to come out after seeing a special tool for sale on Mac's Mine is a mother****** to get out.

 

Yeah well a drain plug is a great idea but after 55 years of (probably) never being touched it could be a real challenge to get out. It would be bad to mess up the plug. Other than the special tool or trying to suck out the lube through the fill hole, the alternative is to disconnect the driveshaft, pop the axles, and drop out the third member. Not the hardest job in the world, but that route inevitably leads to "well now I should change the gasket, and as long as I've got the axles out I should replace the bearings and seals, and those brake lines are looking a little cracked," etc. etc., and then you're broke.

 

At one time there was actually a tool to remove both drain and fill plugs, I don't know of any made these days. I have both, one is a little smaller then 3/8 and one is a little larger the 1/2. They look like a short extension and fit on 1/2 drive ratchet/breaker bar.

Edit: Looks like Harbor Freight has a cheapo set of 12, both hex and square.
http://www.harborfreight.com/12-piec...set-94961.html

 

Thank you all for your help,hmmm, take out driveshaft,axles bearings,seals, might as well do pads,drums,wheel seals, wait,uh,I thought I was doing a fluid change,last time I changed rear fluid, 1983, still looked good. O.K. let's get started