Overview
The G2 AAM 9.25 Inch Front Ball Milled Aluminum Cover (part 40-2026MB) is a black cast aluminum differential cover for front AAM 9.25 inch axles only.
The cover helps cool the gear oil, which supports bearing life, while the ball milled ribs add rigidity. The aluminum is heat treated and shot peened to handle direct hits, and the seal surface is fully machined for a leak-free fit. It protects the ring and pinion and gives the front axle a finished look.
Key features
- Cast from lightweight aluminum to dissipate heat from the gear oil
- Ball milled reinforcing ribs for rigidity and strength
- Heat treated and shot peened body for direct impacts
- Fully machined seal surface
- Filler plug, fill level plug and drain plug for service
- Dipstick for simple maintenance
- Black powder coat finish
Gear oil and cover service
A differential cover does more than seal the housing. It keeps dirt and water away from the ring and pinion, and it gives the gear oil more surface area to shed heat. Gear oil that runs hot breaks down faster, so a cover that helps the oil stay cooler supports the bearings and gears on steep grades and long highway runs alike.
Before fitting a cover, clean the old gasket material off the housing face and check that the flange is free of burrs. Use the filler and fill level plugs to set the oil at the correct level, then recheck it after a short drive. After trail use, look for dents, weeping at the seam and loose plugs, and tighten them rather than waiting for a leak.
- Clean the housing face before fitting
- Recheck oil level after a short drive
- Inspect for dents, weeping and loose plugs after trail use
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | 40-2026MB |
| UPC | 631410113075 |
| Material | Cast lightweight aluminum |
| Finish | Black powder coat |
| Axle location | Front |
| Axle type | AAM 9.25 inch |
| Oil capacity | Extra |
| Service plugs | Filler, fill level and drain |
| Dipstick | Included |
Vehicle fitment
It fits front AAM 9.25 inch axles only, and it is not a rear cover. Vehicle years and models are not part of the fit, so match the front axle before ordering.
Measure or identify your front axle before ordering to confirm it is an AAM 9.25 inch unit.
Installation notes
The seal surface is fully machined, which G2 says gives a leak-free installation, so keep the mating face clean when you fit the cover.
What’s included
A black aluminum cover with its filler, fill level and drain plugs and dipstick.
Not included: Gear oil.
