I use LE 1605 Duolec (SAE 110 GL5) in my 2000 Tundra, 2012 4Runner, 2004 S2000, and daughter's 2008 Avalanche rear diffs. I'm sure this would make CAFE fans choke, but it sure does run and protect well. I'll be posting a UOA soon for the Tundra.
I had to order a new 5 gallon pail last week, because I only have 2 qts left for the Tundra drain and fill. The Tundra takes 3.5 qts for a fill. $199/pail shipped if anyone is interested in the price.
I think Pablo's recommendation to use 75W110 SVT Amsoil is a good one too. I just wish there were some UOA's to help us evaluate it more.
The only good Redline UOA I've seen was with their HD Shockproof gear oil in a rear diff. The only RL 75W90 GL5 I've seen in a S2000 rear diff was unacceptable IMO.