Why replace the factory R35 differential cover?

The factory cover is cast aluminum, and T1 Race Development believes it flexes under load and contributes to differential failure, which almost always breaks the cover too. The GT1R CNC cover is machined from 6061 billet and located by three shoulder bolts, so it holds the differential rigidly at power levels far beyond factory.

Does the Differential Cover for R35 come with a differential brace?

Yes, partly. The T1 Differential Cover for R35 includes a redesigned upper differential brace and all mounting hardware, because the shoulder bolts on the cover changed the upper brace mounting points. The lower brace is not included. It fits both the factory cover and the CNC cover, so owners of the T1 brace set can keep using the lower brace they already have.

Which model years does the GT1R CNC cover fit?

It fits every R35 Nissan GT-R from 2009 to 2024, but T1 Race Development machines two versions, one for 2009 to 2014 cars and one for 2015 and later cars. Choose the version that matches the model year of the car when ordering. Both versions carry the same price and ship with the same redesigned upper brace and hardware.

What is the GT1R CNC differential cover made from?

It is machined from 6061 aluminum. Each cover starts as a 58 pound billet and finishes at 8.75 pounds after many hours in the CNC machine, with the brace mounting points cut into the same piece. T1 Race Development produces it with Frontline Fabrication.

Does a street R35 need a billet differential cover?

Usually not. T1 Race Development developed the cover for GR6 transaxles in builds of 1,500 to 2,500 wheel horsepower, where hard launches load the differential far beyond factory levels. A stock or lightly modified GT-R on street tires rarely stresses the cast cover enough to justify the cost, while a car with a built transmission or an upgraded differential is a strong candidate.

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Description

T1 Race Development GT1R CNC Rear Differential Cover for R35 Nissan GT-R

T1 Race Development’s GT1R CNC Rear Differential Cover for R35 Nissan GT-R replaces the cast cover that almost always breaks when a GR6 differential fails, and that T1 believes flexes enough under load to help cause the failure in the first place. Produced with Frontline Fabrication, each cover starts as a 58 lb block of 6061 aluminum and leaves the machine at 8.75 lb, and a prototype ran on T1’s own drag car for a couple of years before the design went on sale. It belongs on a transaxle carrying four-figure horsepower.

Design and Performance

Three shoulder bolts locate the cover on the transmission housing, so it sits with no slop and returns to exactly the same position after every service. Those shoulder bolts moved the attachment points, so T1 redesigned its upper differential brace around them and machined mounting provisions into the cover itself; the new upper brace ships in the box with the hardware. T1 pairs it with the ShepTrans and Wavetrac upgraded differential on its own builds.

Features

CNC machined from a single block of 6061 aluminum
Finished weight of 8.75 lb
Three shoulder bolts for precise, repeatable location against the transmission housing
Machined mounting points for the redesigned GT1R upper differential brace
Developed with Frontline Fabrication

What’s Included

GT1R CNC rear differential cover
Redesigned GT1R upper differential brace
Mounting hardware

Applications

Nissan GT-R: R35 | 2009-2024 | 3.8L VR38DETT V6

Notes

Choose the version for the model year of the car; T1 machines the Differential Cover for R35 separately for 2009-2014 and 2015-2024 cars
The lower differential brace is not included; T1 sells it separately, and it fits both this cover and the factory one
Owners of the T1 Race Development GT1R Upper and Lower Transmission Brace Set (T1-R35-ULTB) keep its lower brace; the upper brace in this kit replaces the one from the set

Frequently Asked Questions

Why replace the factory R35 differential cover? The factory cover is cast aluminum, and T1 Race Development believes it flexes under load and contributes to differential failure, which almost always breaks the cover too. The GT1R CNC cover is machined from 6061 billet and located by three shoulder bolts, so it holds the differential rigidly at power levels far beyond factory.
Does the Differential Cover for R35 come with a differential brace? Yes, partly. The T1 Differential Cover for R35 includes a redesigned upper differential brace and all mounting hardware, because the shoulder bolts on the cover changed the upper brace mounting points. The lower brace is not included. It fits both the factory cover and the CNC cover, so owners of the T1 brace set can keep using the lower brace they already have.
Which model years does the GT1R CNC cover fit? It fits every R35 Nissan GT-R from 2009 to 2024, but T1 Race Development machines two versions, one for 2009 to 2014 cars and one for 2015 and later cars. Choose the version that matches the model year of the car when ordering. Both versions carry the same price and ship with the same redesigned upper brace and hardware.
What is the GT1R CNC differential cover made from? It is machined from 6061 aluminum. Each cover starts as a 58 pound billet and finishes at 8.75 pounds after many hours in the CNC machine, with the brace mounting points cut into the same piece. T1 Race Development produces it with Frontline Fabrication.
Does a street R35 need a billet differential cover? Usually not. T1 Race Development developed the cover for GR6 transaxles in builds of 1,500 to 2,500 wheel horsepower, where hard launches load the differential far beyond factory levels. A stock or lightly modified GT-R on street tires rarely stresses the cast cover enough to justify the cost, while a car with a built transmission or an upgraded differential is a strong candidate.

About T1 Race Development

T1 Race Development was founded in Texas in 2005 by Tony Palo, whose 2000 Acura Integra GSR became the first eight-second front-wheel-drive street car before the shop turned its attention to the Nissan GT-R. T1 went on to become the first to exceed 230 mph in the half mile in a GT-R and the first to make 2,400 whp from the VR38DETT, and it now develops engines, drivetrain parts and complete builds for the R35 GT-R, Lamborghini Huracan and Audi R8.

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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T1 Race Development GT1R CNC Rear Differential Cover for R35 Nissan GT-R

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T1 Race Development GT1R CNC Rear Differential Cover for R35 Nissan GT-R

Design and Performance

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About T1 Race Development

Reviews