My knob gets stiff when hot (LT77)

Got any oil in the box?

AWEM

Start by considering excessive heat generation - is there enough oil, the correct oil? Is the gearbox casing so covered in a layer of mud/oil that cooling is impeded?

I'd guess that you'll find the cause somewhere in the above.

If the gearlever normally moves freely you'll probably have a feeling for whether or not this problem is just the lever ball/socket stiffening up or something deeper into the gearbox. Does the movement stiffen up in both fore/aft and transerse directions? I don't know how that ball/socket is lubricated. Excessive heat could well tighten up the ball/socket movement.

Remember, it uses ATF/AQF, even though it's a manual box. I think engine oil was once recomended in the past too.

Definatley *NOT* EP type gear oil! (Unless it's all you've got and you're miles from civilisation on a bank holiday monday in a desert somewhere.)

Of course, as suggested, it may just bee the lever ball mounting on top of the box stifening when things warm up a bit. It's not lubed from within the box, but under a rubber cover, that might have split and let dirt in?

Regards.

DaveB