1939 differential plugs
 

I have tried using a 3/8" socket extender (too small) and a 1/2" one (too big) to remove each of the plugs. It appears that the plugs have been rounded inside. I have also used a flat head screwdriver with the 3/8" but no joy. Suggestions????

PS: I also have a Columbia 2-speed attached that has a plug that I can use a wrench on. Will that plug also fit the differential?

Re: 1939 differential plugs
 

I have ground down extensions to make them fit. When you do get it out replace it with one that has external “nut”.

Re: 1939 differential plugs
 

At work, on stuff like that if there was room for it, we welded a thick-headed nut to them or drilled them out and used a large easy to take them out.

Re: 1939 differential plugs
 

I've found it worthwhile to purchase a set of female (socket is male) drain plug sockets. They were cheap and can be found on Amazon or other on-line vendors.

I did a quick Google search and these came up at Walmart. I would look for Sunnex or similar brand.

https://www.walmart.com/ip/18pcs-Oil...ive/2569355942

Re: 1939 differential plugs
 

Hi Guys, Thanks for all your suggestions. I seem to have implemented a little bit of each. It turns our that I had an oversized 3/8" extension that, while a little lose, did the trick. (Who would have thought that some would be different.) I will be replacing both plugs with ones that have an square head.

Re: 1939 differential plugs
 

Once you have the proper tool and good plugs that are not wallowed out from someone using the wrong tools in the past, you would not have problems installing or removing the original type plugs. Personally, I would not want the plugs with the extended square on a banjo rear, especially on the the bottom plug. JMO

Re: 1939 differential plugs
 

Third Gen Auto sells the plugs with a slightly smaller inside so a 3/8 ratchet fits. There is a very tight space between the rear frame cross member and the banjo make sure any plugs with an extended head do not touch the cross member when the spring is compressed.

Re: 1939 differential plugs
 

I believe that folks WAY over-tighten plugs. The interference fit along with a bit of pipe dope or pipe tape eliminates the need to force them as far in as possible. IMHO