I have a '95 F150 with the Mazda 5 speed manual tranny. I need to buy a wrench for the fill plug. I measured it and it seems to be either 24 mm or 15/16". Can anyone confirm which? Or given how close they are maybe it doesn't matter, but I can't get it off with my big 12" adjustable wrench, so I want the best fit I can get.

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The fill/drain plugs are both 15/16" wrench size. I just removed mine 10 minutes ago to add fluid because I sent my truck to a local shop to have a clutch install done. While it was in the shop, they installed a shift lever bushing kit but didn't tighten the cover properly therefore all my fluid leaked out. Anyway, a 15/16" wrench or socket is what you will need.

 

being the thread size is 18mm x 1.5 and it's made in Japan I'm pretty sure it is Metric and Not Sae 24mm is 0.945 and 15/16 is 0.937 so the tightest fit would be the 15/16 6 point socket.

 

Really hope the OP didn't wait 17 years for the answer........

 

yeah Really figured he got his answer in 2K2 but that person deleted it