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Complete Replacement 3rd Member for 2016-2023 Toyota Tacoma, 4.30 Gear Ratio Open Carrier
The Yukon Gear YDAT8.75-430 is a complete assembled third member dropout assembly for the Toyota Tacoma T8.75 rear differential with a standard open carrier and 4.30 gear ratio. This unit drops directly into your 2016-2023 Tacoma's rear differential housing, replacing the entire ring and pinion, open carrier, and associated hardware as one assembled unit. The YDAT8.75-430 is the correct choice for open-differential Tacomas that need a gear ratio change to match larger tires. The 4.30 ratio is widely used on Tacomas running 35-37 inch tires to restore factory driveability and cruise RPM.
Key Features
- Complete Assembled 3rd Member — drop-in replacement for the Toyota T8.75 rear differential
- 4.30 Gear Ratio — popular upgrade for 35-37 inch tire applications
- Standard Open Carrier — for Tacoma models without factory E-Locker
- OEM Reference Design — engineered for direct fitment in 2016-2023 Tacoma T8.75 housing
- Dropout Design — replaces the full 3rd member without housing removal
- Yukon Gear Precision Machining — quiet operation and long service life
| Specification | Detail |
|---|---|
| Part Number | YDAT8.75-430 |
| Brand | Yukon Gear and Axle |
| Differential Type | Toyota T8.75 Rear |
| Ring Gear Diameter | 8.75 inches |
| Gear Ratio | 4.30 |
| Carrier Type | Standard Open |
| Ring Gear Bolt Count | 12 |
| Spline Count | 34 |
| Assembly Type | Complete 3rd member (dropout) |
| UPC | 883584217106 |
What's Included
- 1x Assembled Toyota T8.75 third member dropout unit (ring gear, pinion, open carrier, bearings)
This Part Fits
| Year | Make | Model | Notes |
|---|---|---|---|
| 2016 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2017 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2018 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2019 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2020 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2021 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2022 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
| 2023 | Toyota | Tacoma | T8.75 rear differential, open carrier (no E-Locker) |
Frequently Asked Questions
-
Q: How do I know if my Tacoma uses the T8.75 open differential versus the E-Locker?
A: Third-generation 2016-2023 Tacomas equipped with a rear electronic locker use the T8.75 housing. Open-differential Tacomas without the locker option also use the T8.75 on some configurations. Confirm by checking your option codes or the axle housing tag. -
Q: Is 4.30 a good ratio for 35-inch tires?
A: Yes. 4.30 is one of the most popular ratio upgrades for 2016-2023 Tacomas running 35-37 inch tires. It restores low-end grunt and reduces the RPM deficit caused by the larger tire diameter at highway speeds. -
Q: Can I install the YDAT8.75-430 myself?
A: The dropout design makes the installation more accessible than a traditional cover-style differential. Drain the fluid, remove the axle shafts, pull the old third member, and install the new unit. Professional installation is still recommended for correct torque, pattern verification, and fluid fill. -
Q: Do I need to match the front and rear ratios?
A: Yes, for 4WD applications the front and rear differential ratios must match to avoid driveline bind during 4WD engagement. Plan a front regear at the same time as the rear when changing ratios on a 4WD Tacoma. -
Q: What gear oil should I use?
A: Toyota specifies 75W-90 GL-5 synthetic gear oil for the T8.75 differential. Fill to the bottom of the fill plug hole. -
Q: Is this the right part for a Tacoma with a factory E-Locker?
A: No. If your Tacoma has the factory rear E-Locker, you need the YDAT8.75-430E, which includes the E-Locker compatible carrier. Using an open carrier will disable the E-Locker function. -
Q: What is the warranty on YDAT8.75-430?
A: Yukon Gear backs this assembly with a Lifetime Limited Warranty. Drivetrain components qualify under Magnuson-Moss Warranty Act consumer protections. -
Q: What is the shipping weight of this assembly?
A: Approximately 90 lbs. Shipping typically requires ground freight service. Residential delivery may require liftgate service.
Installation Notes
- Drain the rear differential fluid before beginning removal
- Remove both rear axle shafts to free the third member for extraction
- Unbolt and withdraw the existing T8.75 third member from the housing
- Install the YDAT8.75-430 and torque all fasteners to Toyota specification
- Reinstall axle shafts and fill with 75W-90 GL-5 gear oil to the fill plug level
- If regearing a 4WD Tacoma, match the front differential ratio to avoid driveline bind in 4WD mode
California Prop 65 Warning
WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Yukon Gear & Axle provides the highest quality aftermarket drivetrain parts in the industry. Yukon products are produced using superior materials and built to tolerances that exceed OE specifications. We do drivetrain right! Yukon manufactures high performance ring & pinions, positractions, lockers, axle upgrades, rebuild kits, hubs, driveshafts, diff covers, and more. Proven at the King of the Hammers and the granite crags and outcrops of Moab, Yukon products are built for abuse so you can gear up and wheel with confidence. At Yukon Gear & Axle we make it our Mission to build quality parts that exceed expectation. It’s that simple! Our in-house engineering group utilizes state-of-the-art software to design product that’s then manufactured in partnership by some of the world’s foremost leaders in OEM manufacturing. After rigorous testing and intense quality inspection, we’re proud to call it Yukon.
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