High-capacity rear differential cover for 1989-2002 Nissan Skyline GT-R R32/R33/R34, GReddy 14520499.
The GReddy 14520499 is a precision cast aluminum high-capacity rear differential cover built for the R200 rear differential in the Nissan Skyline GT-R BNR32, BCNR33, and BNR34, powered by the RB26DETT engine. By increasing differential oil capacity by roughly 550cc on the R32 and up to 750cc on the R33 and R34, the cover raises the oil’s total heat mass, helping protect the limited-slip differential and final gear from heat-related failures during hard driving or track use. Internal baffle plates control oil surge under acceleration, braking, and cornering loads, and an integrated 3/8 PT threaded port accepts an optional external oil cooler line for extreme-duty cooling. The 14520499 is a direct bolt-on upgrade using the factory mounting points and factory carrier gasket.
Key Features
- GReddy 14520499 increases rear differential oil capacity by approximately 550cc (R32) to 750cc (R33/R34)
- Larger oil volume increases heat mass, helping protect the LSD and final gear from heat damage
- Internal baffle plates control oil surge under hard acceleration, braking, and cornering
- Integrated 3/8 PT threaded port accepts an optional external differential oil cooler line
- Reinforced construction around the drain bolt area reduces the risk of cracking during oil changes
- Precision cast aluminum construction for durability and heat dissipation
Fitment
| Year | Make | Model | Trim/Submodel |
|---|---|---|---|
| 1989-1994 | Nissan | Skyline GT-R | BNR32 |
| 1995-1998 | Nissan | Skyline GT-R | BCNR33 |
| 1999-2002 | Nissan | Skyline GT-R | BNR34 |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | 14520499 |
| Position | Rear differential |
| Compatible differential | R200 (non-active LSD variants) |
| Compatible engine | RB26DETT |
| Added oil capacity | Approx. +550cc (R32), +750cc (R33/R34) |
| Material | Precision cast aluminum |
| Cooler port | 3/8 PT threaded, for optional external cooler |
What’s Included
- One (1) GReddy 14520499 high-capacity rear differential cover
About GReddy
GReddy engineers its high-capacity differential cover line to address a known weak point on the R32/R33/R34 GT-R’s rear differential, using added oil volume, internal baffling, and reinforced construction around common failure points like the drain bolt area to extend differential service life under hard use.
FAQ
Does this cover fit an active LSD-equipped GT-R?
No. This cover is designed for the R200 differential in non-active LSD applications; active LSD-equipped models are not compatible.
How much additional oil capacity does this cover add?
It adds approximately 550cc on the R32 and up to 750cc on the R33 and R34, depending on the specific vehicle.
Does this cover include an oil cooler?
No. It includes an integrated 3/8 PT threaded port that accepts an optional external oil cooler line, which is sold separately.
What gasket or hardware do I need for installation?
The factory carrier case gasket and breather nipple are reused during installation; a new gasket should be used if the factory unit is damaged.
Does this cover help prevent differential cracking?
Yes. GReddy reinforced the area around the drain bolt to reduce the risk of cracks that can occur during routine oil changes on the factory cover.
What material is this cover made from?
It is made from precision cast aluminum for durability and improved heat dissipation compared to the factory steel cover.
Will this cover work with my factory differential oil?
Yes, though many owners pair the added capacity with a high-temperature gear oil suited to track or high-load use; consult GReddy’s fitment notes for specifics.
Is this a bolt-on installation?
Yes. It bolts on in place of the factory differential cover using the factory mounting points.
Installation Instructions
- Raise and safely support the rear of the vehicle, then drain the existing differential oil into a suitable container.
- Remove the factory differential cover bolts and remove the factory cover, then clean the mating surface thoroughly.
- Install a new gasket if needed, then mount the GReddy 14520499 cover using the factory bolts, torquing to the manufacturer’s specification in a criss-cross pattern.
- Connect an external oil cooler line to the 3/8 PT port if using one, ensuring all fittings are sealed properly.
- Refill the differential with the correct type and quantity of gear oil, accounting for the added capacity, then check for leaks before returning to normal use.
