PackardDon wrote:
The issue with a positive ground car is the direction of the spark and the temperatures of the two surfaces from and to which it jumps. On positive ground cars, it has to work harder to bridge the gap and hence the narrower setting. I seem to recall that on my 1940 it was only .025” but I typically set it to no more than .028” if I wanted it to run smoothly under all circumstances.

Wat_Tyler wrote:
Drumming my fingers waiting for Friday . . . .

Marvin wrote:
O’Reilly’s auto parts, provided the gasket for the differential and gear oil (85-140). The reason I stopped was realizing the depth of my ignorance. I reviewed the “Packard Service Manual” but failed to answer my questions. Mostly it covered how to repair the internal components of the differential. It also stated that the fluid should be changed annually.
Before I begin loosening bolts, I would like to know a few things.
1. The plug the arrow is pointing to, seems to be the only plug front and back. Is this the check level / fill plug?
2. It’s been a few years since I checked a differential for fluid capacity. I seem to recall, removing the fill plug, and sticking my finger in to check to see that oil was at the bottom of the hole. Is this correct?
3. What else should I look for when the cover is off?
My thought process is that this is a 66-year-old car and I have no way of knowing if any maintenance was done and when. As always, your patience and guidance is extremely appreciated.

r1lark wrote:
Not mine, Facebook listing in NC, $3500, might not be too bad of a car, too bad it's not a 3spd/OD. Says engine is stuck.
Link: Packard in NC