Which cars does the High-Volume Silver Diff Cover for GZEA14H fit?

Cusco USA lists part number 1C7 008 AS for the Toyota GR Corolla (GZEA14H, 2023-2026) and the Toyota GR Yaris (GXPA16, 2020-2025). The High-Volume Silver Diff Cover for GZEA14H bolts to the factory rear differential in place of the original cover, so no machining is needed.

Why does a bigger diff cover help?

A larger cover holds more gear oil, so the same amount of heat raises the oil temperature less, and the cooling fins carry heat away into the airflow under the car. On a track car or a car with an LSD that sees hard use, that keeps the oil within a safer range for longer, which protects the gears, bearings and LSD plates.

How much more oil does it hold?

Cusco rates this cover at 250 cc more than the factory part. After fitting it, the differential is filled to the level of the cover fill plug as usual, which takes the extra oil into account. Use the gear oil grade the car or the LSD maker recommends.

Is it hard to install?

No. It is a direct, bolt-on replacement for the factory cover. The car is raised, the old oil drained, the factory cover removed and the mating faces cleaned, then the Cusco cover is fitted and torqued to the figures Cusco gives before the differential is refilled with fresh oil.

Does it work with a Cusco LSD?

Yes. The cover replaces only the outer housing of the differential, so it works with the factory differential or an aftermarket LSD such as a Cusco Type RS or Type MZ. A clutch-type LSD that sees track use benefits most from the extra oil and the cooler running temperature.

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Description

Cusco High-Volume Silver Diff Cover for GZEA14H Toyota GR Corolla and GXPA16 Toyota GR Yaris

Cusco’s High-Volume Silver Diff Cover for GZEA14H Toyota GR Corolla and GXPA16 Toyota GR Yaris replaces the factory rear differential cover with a billet aluminum cover that adds 250 cc of oil capacity and carries cooling fins on its outer face. More oil and more surface area give the differential more thermal margin on long track sessions, when gear oil temperature climbs fastest. It bolts on in place of the factory cover with no other changes and comes in silver anodizing. It suits any of these cars that sees regular track days, or drift events, and it pairs naturally with a Cusco LSD.

Design and Performance

Gear oil thins as it heats, and a hot differential loses film strength just when the clutch plates of an LSD and the ring and pinion are working hardest. The High-Volume Silver Diff Cover for GZEA14H holds 250 cc more oil than the factory cover, so the same heat load is spread across more fluid, and its finned billet body sheds heat into the airflow under the car. Cusco notes that this cover is not designed for use with an external oil cooler kit.

Features

Billet aluminum with cooling fins
+250 cc oil capacity over the factory cover
Bolt-on, OE replacement type
Silver anodized finish
Plugs included, per Cusco

Specifications

Cusco part number: 1C7 008 AS
Type: High Volume Diff Cover, Silver
Material: Billet aluminum
Added capacity: +250 cc
Fitment: OE Replacement Type, Bolt-on
Position: Rear differential

Applications

Toyota GR Corolla: GZEA14H | 2023-2026 | 1.6L 3-Cylinder Turbo (G16E-GTS)
Toyota GR Yaris: GXPA16 | 2020-2025 | RZ / RC AWD Model

Notes

Refill with fresh gear oil to the new, higher level after fitting the High-Volume Silver Diff Cover for GZEA14H
Cusco: Billet Aluminum with Cooling Fins, Cannot be used with External Oil Cooler kit

Frequently Asked Questions

Which cars does the High-Volume Silver Diff Cover for GZEA14H fit? Cusco USA lists part number 1C7 008 AS for the Toyota GR Corolla (GZEA14H, 2023-2026) and the Toyota GR Yaris (GXPA16, 2020-2025). The High-Volume Silver Diff Cover for GZEA14H bolts to the factory rear differential in place of the original cover, so no machining is needed.
Why does a bigger diff cover help? A larger cover holds more gear oil, so the same amount of heat raises the oil temperature less, and the cooling fins carry heat away into the airflow under the car. On a track car or a car with an LSD that sees hard use, that keeps the oil within a safer range for longer, which protects the gears, bearings and LSD plates.
How much more oil does it hold? Cusco rates this cover at 250 cc more than the factory part. After fitting it, the differential is filled to the level of the cover fill plug as usual, which takes the extra oil into account. Use the gear oil grade the car or the LSD maker recommends.
Is it hard to install? No. It is a direct, bolt-on replacement for the factory cover. The car is raised, the old oil drained, the factory cover removed and the mating faces cleaned, then the Cusco cover is fitted and torqued to the figures Cusco gives before the differential is refilled with fresh oil.
Does it work with a Cusco LSD? Yes. The cover replaces only the outer housing of the differential, so it works with the factory differential or an aftermarket LSD such as a Cusco Type RS or Type MZ. A clutch-type LSD that sees track use benefits most from the extra oil and the cooler running temperature.

About CUSCO

CUSCO is the brand of Carrosser Co., Ltd., founded in December 1977 and based in Takasaki, Gunma Prefecture, Japan. Carrosser designs and builds coilovers, limited-slip differentials, clutches, roll cages and chassis parts, sells its steel cages under the Safety 21 name, and competes in every All Japan Championship category from circuit racing to rally and gymkhana. CUSCO USA, a division of Carrosser, is based in Huntington Beach, California.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Cusco High-Volume Silver Diff Cover for GZEA14H Toyota GR Corolla and GXPA16 Toyota GR Yaris [1C7 008 AS]

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Cusco High-Volume Silver Diff Cover for GZEA14H Toyota GR Corolla and GXPA16 Toyota GR Yaris

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

Reviews