Tacoma on 33s: Which Gear Ratio?

For a Toyota Tacoma (3rd gen) (SR5 V6 automatic baseline: 3.91 gears on 30.5-inch factory tires), 33-inch tires need a 4.23 restore-stock ratio just to feel factory again. Here is every real candidate, judged.

Axle ratio	Crawl ratio	RPM @ 70 on 33s	Verdict
3.91	36.1:1	1,617	Highway-leaning — under restore-stock; expect downshifts and a lazy feel.
4.30	39.7:1	1,778	Factory manners — within a few percent of restore-stock.
4.56	42.1:1	1,886	Dual-purpose sweet spot — one honest step deeper than stock.
4.88	45.1:1	2,018	Dual-purpose sweet spot — one honest step deeper than stock.
5.13	47.4:1	2,122	Trail-leaning — crawl-first gearing; cruise RPM is the price.
5.38	49.7:1	2,225	Trail-leaning — crawl-first gearing; cruise RPM is the price.

Crawl uses first gear 3.60 × the platform's deepest factory low range 2.57:1. Cruise RPM uses top gear 0.58 of the AC60 6-speed automatic (V6 ECT-i). Highlighted row: closest to restore-stock.

How to read this

Restore-stock (4.23) is the floor: it returns the exact RPM and response the truck had on its factory tires. Going less gear than that on 33s is borrowing against the transmission — it will downshift on grades and feel gutless in the passing lane. One step deeper than restore-stock is where most dual-purpose builds land: the crawl ratio climbs into genuinely useful territory and the cruise penalty is a few hundred RPM. Two steps deeper is a trail-first build that happens to drive home.

The other half of the decision

The ratio is the cheap part of this page. The expensive parts are everything attached to it: whether your carrier crosses a break at that ratio, whether a locker goes in while the diff is open, and what a shop should charge. That is the Decision System's job — it builds the parts list and budget for exactly this combination. Or run more candidates yourself in the regear comparison calculator.