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Do not worry about using GL-5 in our differentials. For decades there has been sulphur in gear lube being it is an anti scuff/anti-weld additive. GL-5 has almost 30% more anti scuff protection as compared to GL-4. Note; Our transmissions do not use gear oil as lube. I could understand why the oil would cause shifting problems, being it would not allow the syncro to clutch quickly and or correctly.
Rick Post Script; I cannot think of any brass in our 8 3/4 rear axles. I have had many of these apart for rebuild or repair Re-clutch power lock sure grip and limited slip 1957 to 1973. To: jymopar@xxxxxxxxxxxxxxx CC: chrysler300@xxxxxxxxxxxxxxx From: Chrysler300-noreply@xxxxxxxxxxxxxxx Date: Wed, 30 Jul 2014 10:45:26 -0400 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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