Re: SAS on 02 tundra
4.88 should feel like stock with 37s. consider 5.13 or something...and before anyone sez thats a weak ratio, there are a lot of factors that contribute to gear strength. look at getting a complete third member from truehi9.com, mike qualley is a great guy and just redesigned the 5.13 gearsets for equivalent strength to the other ratios. even the 5.13 is pirate-proof now, and it'll give you a little extra kick to get the wheels turning.
there is no way your axles are 74" wms. they're probably 69f/67r, or 69/69, or 67/66, unless they were modified and extended. the widest production "normal" axle is at 69.5", my custom rear is coming at 72" wms and i'll be running a lot of backspacing...like 5-6".
also, once you put a wide tire on there, you're pushing 90" from outside to outside of the tire...you'll about need a shoehorn around town and on the trail. if you run a standard hummer rim, you can get a ton of backspacing but might have trouble finding steering arms for a d44 (cuz i bet its a d44) that will work with 7" backspacing. i know theyre available for d60 knuckles, it might be worth a swap to dedenbears like jjc's front setup if you decide you need the track width narrower.
yeah...i've been doing a lot of web wheeling lately...i'm doing what youre doing and it's all going in autocad first for a reality check since i'm also dovetailing the rear about 10" on a side, and i gotta give a nod to street legality regarding how far out the tires sit beyond the glass. at 74" with a tire ~14" wide, you'll be something like 3-4" beyond the trd flares, consider glass to cover them instead, also you wont be able to stuff a 38 in the stock wheel well anyway. largest that will fit is a 35.
for reference iirc tundra wms is 67" front/66" rear.
-sean
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