Fluid change - recommendations

[Dave Rifkin]

I have a 1969 L46 Corvette that I have been told should have the rear end fluid changed. I recall seeing, on this forum or one of the Corvette forums I frequent, where the guys suggested using Ford's friction modifier when I change the gear oil. Is that something this group would suggest over a GM product (or any other manufacturer).

I was wondering if I should change the manual transmission gear oil while I am at it and was hoping to get some product suggestions or tips from the guys on this forum.

Ultimately I would love to get a list of recommended products to use when changing the rear gear oil, transmission gear oil as well as antifreeze (while I am at it)

One more question; for a car such as mine that doesn't see that much use should I stick with conventional oil in the engine or is synthetic recommended?

Thanks