Just talked to a very knowledgeable 1-gen Tundra and gear guy. He's got a supercharged 05 with ARBs F/R on 35's with armor and all that. Thought i'd share with you what he said about gear ratio for 35s.-
"Depends on how heavy the wheel/tire combination would be.
If the mass would be steel wheels or 45+ lb beadlocks/double beadlocks, then I'd recommend 4.88's.
If each tire is 58-70 lbs or less each I would go with 4.56 gearing.
Anything over that, 75-80+ lb tires+heavy wheels, go with 4.88's
BIG PROBLEM with 4.88 gears is they are weaker!
4.56 with more teeth, thicker pinon teeth than 4.88's, do some research.
You'll decide 4.56 over the 4.88's like I did based on this information.
escondidotundra ended up breaking his 4.88 gears over 7-8 times.
Larger tires/heavier tires/wheels will equal more stress/strain on the pinion/ring gear and you will end up breaking the 4.88 gears.
4.56 gears do not have this problem with the 8.4" 3rd member
Same with the 7.5" Reverse diff.
4.88's on the front diff will be a major problem . Even tinier teeth and no strength will break them with heavy wheel/tire combo, mud suction, hills, or spinning the tires/wheels under load.
Go 4.56 gears, NITRO. Solid pinion collars, Then cryo treat everything like the ring/pinion, bearings like I did for strength.
GET all NITRO stuff."