[6pack] rear axle lub

[PeterSchop at aol.com]

Bob,
 
It is my understanding that GL5 has additives that will over time eat away  
the bronze washers and synchros in the diff and trans. When I drained the gear  
lube out of my diff on the 6, there was a sludge floating on the top which  I 
believe was the dissolved bronze washers. You can buy GL4 from TRF in  quart 
bottles. NAPA carries it also.
 
Peter Schoppelry
 
Bob writes:

Hello,

I am looking at the specs for the rear  axle lubricants and they specify GL4 
90 
EP.

Is GL4 still required for  6 components and std gearbox or can I use a 
synthetic such as Mobil 1 75-90  GL5?

Thanks,

Bob




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