Found this under 1867 this morning.
Yep, that's the transmission that I got professionally* rebuilt just four months ago by The Automatic Gearbox Company.
Thought it might be the sump gasket as everything looked dry above.
I re-torqued the bolts, all of which were at least 2/3 of a turn under spec. Didn't stop the leak though.
Used a mirror and flashlight next to get a top-down view from above the transmission and spotted a pool of ATF around the base of the dipstick tube.
I'm sure that was new four months ago...
May as well get an eyefull of the rest of their work while I'm under here.
Why bother using a square drive? Just hammer a flat blade screwdriver in there like the professionals*.
Save yourself some time and just cut transmission lines. You can bodge them back together later!
Thanks Automatic Gearbox Company. Not only are they £50 each, they're a pain in the arse to change.
June '81 No. 1867