Rearend help...........?
 

I got the gear swap, and trak lok rebuild done but now I need to put some gear oil in.... What size allen wrench (or whatever I need) do I need to take that screw out of the back? Thanks in advance.......................

I dont know what year of stang you have but in my 8.8 inchj rear end the fill plug takes a 3/8 ratchet just stick a 3/8 extension in the plug and it screws out

Hope this helps

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit 3.73 FMS gears cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires. Edelbrock 1 1/2 inch drop springs.