So I was at the parts store and saw a few products that are small quantity "one shots" to be added to the diff oil to act as high pressure additives. I figured at the time it may be a good thing to put in the Ruckstell but wasn't convinced enough to buy some. Now I am wondering if there is a risk to the bronze components?
I don't think those type of products offer any reward and certainly would not see any risk.car's parts.
What perceived benefit would you see from an additive that is for extreme pressure in a car that has less horsepower than my garden tractor Erich?
Royce, good point. I guess the plain old vanilla lube is more than fine for Lizzy. One of those things you didn't need till you saw it and started thinking to much.
Model T rear ends do not need E.P. additives. In fact, the Ruckstell does best with a lighter weight lube like SAE 90 wt. Be sure to use updated axle seals to contain the thinner oil and keep it off your brakes.
Erik
As you suspected, in the past, some EP compounds had sulphur compounds that attack copper alloys. You only need an EP compound in a hypoid gear set. Most modern axles are hypoid. The pinion axis does not intersect the ring gear axis, but is offset below to lower the driveline height. The hypoid gearset action is a combination of a rolling and sliding action. These did not appear in a Ford car until 1949.
I have heard the sulphur compounds vs. bronze parts argument for many years. What I don't understand is why the old syncromesh transmssions that used bronze syncro rings and the old two speed truck rearends that used bronze pins in them, along with MANY other gearsets that used bronze components never had any problems with those type lubes. Just sayin'. Dave