HELP! What is the size of the sqaure recess in the differential drain/fill plug of my 92 Legacy. It seems to be about 5/8" across. That's about 15.8MM. Also is the front diff the same wrench? Want to change fluids today. Thanks.

Do a search for "rear differential" you'll see some discussions on changing the oil. Seems as if your drive extention of your socket wrench should work fine for the rear, not sure about the front though. Also a good recommendation for the rear is to lossen and remove the top plug first...wouldn't want to drain the oil out from the bottom, only to find the top stuck tight and no way to replace the empty differential.:boohoo:

I think the rear diff's plug recess fits a 1/2 inch ratchet drive perfectly. Does on mine and I think these plugs are the same on all models.

Suzam,

 

I found somewhere that a 1/2" drive will fit. Also, I always take the fill plug out first. Thanks for the info.

Frag,

 

Thanks. That is what I found after doing some searching on google. Thanks again.