I use Rotella 15w-40 in mine. I'm in Virginia so Winters are not brutal here. The only two places where you can probably find an original light switch would be a New Holland dealer or a tractor bone yard if you have any near you. eBay might, also.
I had a pail full of knobs of all types from my old Mustang and F100 parts but none are big enough for the shaft on the tractor switch. I thought I was going to get lucky because usually Ford would share stuff like that between models.
Good stuff, but mostly only goes up to 1964.
I used Yesterdays tractors for most of my 3000 parts orders.
There is a good chance that the grease in the leveling box has gotten solid. You can take it apart, but getting the pins out can be fun. Use lots of penetrating oil, a brass drift, and a 5 lb. hammer, and you may need the ole flame wrench but they will come out. You can then inspect it and hopefully only have to clean it out, replace and put fresh grease in her.
Good news. Trailer manufacturer called me and said trailer is still warrantied and to call them. So that's encouraging. I'll post more once I talk to them.
