spotting your username reminded me of the old late boss once suggesting his V8 RangeRover was using less petrol than my fully loaded works truck - a...
I have come across some that you can unscrew the inner male bit, usually needs the gland nut undone to allow the inner bit and lead/wires to rotate,...
There was a well known old boy by the name of Nelson Green from up Lincolnshire way who used his demob money after WW2 to buy a bit of land and setup...
I have stopped using the for overhauls now. Had nothing but hassle with them and problems. Just not good enough when they charge top price i want it...
Sounds like your getting reverse in a forward gear which will act as a brake. The oil getting hot could also be a clue in that something is slipping...