250 wt Rear Differential Oil

Back in those days there was not the anti-wear, anti-scuff additives and synthetics that exist today, so better and more effective alternatives exist that will do a way better job than the old heavy stuff engineered so to provide protection because of the lack of effective go juice available today.
I am sorry but I don't have a line on the heavy stuff. Would something better do?

 

Well sure something better might do, but I haven't found anyone that can reccomend a modern oil that gives satisfactory results yet. Can you? The heaviest I could find was something like 150 weight.

 

I had to replace the rear axle seals on our Pf coupe a few years ago. I believe I recall pumping Valvoline hypoid 90 weight into the rear end. I found a very handy 2 gallon jug with a hand pump on it. Have not had any whine or other problems since then. None before either, just a huge leak at the left seal. Ferrari of Seattle had no idea as to what seals to sell me, so I popped them out and took them to a bearing store and they matched them up perfectly with new units.

 

Ferrari recommends a modern (I think it is 90/140) synthetic, even for older cars. So far it is OK in my 330 (about 3500 miles worth). No noise, leaks, or posi chatter.

If you are really set on thick oil/grease, research the Antique car suppliers.

Cheers
Warren

 

There are long discussions of diff oil choices and where to get them on Tom Yang's and Kerry Chesbro's sites

 

Penrite is the only company that I know of that makes a 250W gear oil for classic cars:
http://www.penrite.com.au/html/s02_article/article_view.asp?id=263&nav_cat_id=140&nav_top_id=55