The only GL-4 that I have found reasonably easily available is the 
StaLube brand available from NAPA. I would have thought any NAPA would 
be able to get it for you.
It does specifically say it will not affect the brass etc.
Alan
Fred Thomas wrote:
>>    Spitfire lovers:
>>        Is gear lube labeled...GL-3,GL-4,GL-5 compatible with a spit
>>gearbox. I couldn't find anything else in my little town and I think my
>>gearbox is thirsty!!
>>                Thanks
>>                Dave Gebhard
>>    
>>
>=================================================================As already
>posted the answer is yes, but, only GL 4 is recommended as GL 5 has
>additives that effect brass syncros, this according to TRF. "FT"
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