Got a 57 F100 and I want to check the fluid in the differential and may drain and change it.The filler plug is frozen and the hole is messed up so a wrench just slips.What can I do to get the plug out short of wielding bolt or some key stock to the plug.

 

Drill it out and chisle it to make it collapse, then get a new plug. Take your time, and don't punch the bigger bits all the way through so as to avoid dropping metal chips into the diff.

Is this on the housing or the carrier?

 

[QUOTE=85e150six4mtod;10726945]Drill it out and chisle it to make it collapse, then get a new plug. Take your time, and don't punch the bigger bits all the way through so as to avoid dropping metal chips into the diff.

Is this on the housing or the carrier?[
It is in the carrier

 

You can probably still drill it out, maybe try and ezout at first.

Heat and pentrating oil are your friends.

 

Had the same problem with a Chevy about a year ago. Tried everything I could think of. Finally lifted one side to get any fluid away from bung, used disc grinder on threaded end of bolt to make it a hammer fit in the hole and hit it with the stick welder. Quenched it with water and put a wrench on the bolt head. Worked like a charm. Wish I had done that in the first place.

 

I might try that.I tried to weld a 3/8 drive extension in the hole but I just have a small 110 mig and it wouldn't penetrate the metal of the extension ,just burned it.I ground the coating off the extension so I was down to bare metal.