John, thanks for the heads up on this.
Having said that, the wording of your notice could lead the reader to believe that the rear axle bearings, located at each wheel end of the differential housing, are lubricated with the same gear lube as the differential assembly. For 1964 and older Chryslers, including letter cars, this is not true. On these cars, the rear axle bearings are packed in axle grease, the same as the front wheel bearings. The greased axle bearings are contained and sealed with two grease seals, the inner grease seal that prevents the impingement of gear lube from the inside, and the outer grease seal mounted in the backing plate that prevents grease from contaminating the brake linings. Chrysler recommends repacking the rear axle bearings every 25,000 miles or at the same interval as the front axle bearings. This requires pulling each axle shaft and replacing both seals on each side. Any leakage of gear lube into the brake drum indicates that BOTH seals have failed.
Many letter cars owners are aware of this design and required maintenance. But you would be surprised how many Chrysler owners I have met over the years who were completely unaware. So I thought I would mention this for clarity.
Chris the KMANIAC
-----Original Message-----
From: 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: 'Jean-Yves' <jymopar@xxxxxxxxxxxxxxx>
Cc: 'Listserver Chrysler Club' <chrysler300@xxxxxxxxxxxxxxx>
Sent: Wed, Jul 30, 2014 7:45 am
Subject: [Chrysler300] gear lube
Found out some interesting ,-- could be important ---stuff.
In Auto Restorer; GL-5 gear lube has sulphur and other additives that attack brass, so not for use on manual transmissions or rear axles with brass / bronze parts ; GL-4 OK ; I know 300F has brass thrust bearings in Axle center (Timken style rear wheel bearings) , many cars of our vintage had brass transmission syncros , brass bushings in diff, etc . I have been using synthetic 75W Mobil 1, not sure now if GL-5 or 4; GL-5 made for all 100% steel bearings, like ball bearings etc typical of new cars , EP additives help those, are in GL-5
Heads up!
John Grady, PE
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Posted by: kmaniak@xxxxxxx
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