I use a big pipe wrench on the pinion yoke, tighten it up so it holds well and then use 1/2 inch or if you can a 3/4 inch breaker and socket to break the pinion nut loose. I use a brass drift, punch, to drive the pinion yoke off of the pinion shaft
as far lube I like and use 75x90Wt non synthetic gear oil with a posi additive for the posi units
On the 4 speed look for Pennzoil synchromesh gear oil and use it
Summit and probably other hi Po warehouses stock and sell it if you can't find it locally like me