Toyota 8.0 V6 Rear Ring and Pinion Set 3.73, 29-Spline

This is a Motive Gear 3.73 ring and pinion set for the Toyota 8.0-inch V6 rear differential with the 29-spline pinion. It is the gear set you order when you are regearing a V6 Tacoma or 4Runner for larger tires, or when the original gears are howling and pitted and the axle is coming apart anyway. It crosses to Revolution Gear & Axle T8-373V6-29 and Yukon Gear & Axle YG TV6-373-29.

Fitment covers Lexus GX470 2003-2009, Toyota 4Runner 2003-2009, FJ Cruiser 2007-2009, Hilux 2004-2014 and Tacoma 2003-2023 with the Toyota 8.0 V6 29-spline rear housing. Toyota ran several 8-inch variants across these years, so count the pinion splines and check the ring gear against what you pull out before you commit - the 8.0 V6 29-spline is not the same as the older 8-inch or the 8.4.

A ring and pinion swap is a setup job, not a bolt-in. Plan on new carrier and pinion bearings, a crush sleeve or solid spacer, and a pinion seal, plus a dial indicator and a bearing puller on the bench. You are setting pinion depth with the shim stack behind the pinion head, backlash with the carrier shims or adjusters, and then reading the pattern in marking compound on both drive and coast sides until the contact sits centered on the tooth. Rushing pinion depth is what makes a fresh set whine at 45 mph.

Run a break-in on the new gears: 20 to 30 minutes of easy driving, then let the axle cool completely, and repeat that a few cycles before towing anything. Fill with the gear oil weight Toyota specifies for your axle, and add friction modifier if there is a limited-slip carrier in the housing.