Neither the transmission drain plug nor the filter housing on the 950F I'm using has been removed in probably 10 years, and both refuse to budge, even with an impact wrench. I went with a strap wrench and then breaker bar on the filter housing first, then to a medium-weight impact wrench (a Napa brand one, supposedly with 400lbs torque), nothing moved even slightly. I hit the plug with the breaker bar and impact wrench, also no movement. I'm wondering at the viability of using a bottle torch to heat up the threads of both, to crack them loose. Barring that, any other suggestions? Picture of the filter housing:
Ball pein hammer and tap around the head just above where the filter bowl joint is located. Go round & round the outside maybe up to 5 times. Then put a long breaker bar on the hexagon on the bottom of the bowl, get the weight on it, then have someone smack the socket sharply upwards with a big hammer.
Hit the transmission drain plug several times a 2 pound hammer. I never ever had one that wouldn’t come out after doing that. You need to hit it squarely.
Could try working on it when it's hot, then wrap the filter housing in snow, ice or cold rags to cool it off. If it doesn't come off with Nige's peening, hold pressure on the breaker bar and go around again peening it. Hold a heavy hammer on the other side of the base from the peeing, or any solid hunk of steel, if there's room. If there's not room, go around what you can reach. The plug should be easier, if it strips, weld a nut to it, let it cool and it should shrink enough to come out.
A 36" Ridgid pipe wrench with a cheater pipe over the handle works for me! Just make sure the jaws are sharp.
Have removed too many to count, doing it the way Nige said. It shocks the threads to let go. Have pressure on the canister when hitting the housing as he said. Simon C