I dont know, I think I will be stubborn and go with Royal Purple.
Also on a side note, on the Redline website both the gear and manual transmission oil is referred to as "gear oil" is it essentially the same thing?
Here is what I will be getting...
for the Tran
Royal Purple Synchromax Synthetic MTF Quart | Product Details | Pep Boys
for the Diff
Royal Purple Max Gear 75W90 Synthetic Quart | Product Details | Pep Boys