The aFe 46-71260B Pro Series black cover fits the specified AAM 11.5 / 12.0 rear differential.
| Years | Make | Model | Trim / required axle |
|---|---|---|---|
| 2020-2023 | Chevrolet | Silverado 2500 HD | Custom; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 2500 HD | High Country; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 2500 HD | LT; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 2500 HD | LTZ; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 2500 HD | WT; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 3500 HD | LT; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 3500 HD | LTZ; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 3500 HD | WT; AAM 11.5 / 12.0 |
| 2020-2021 | GMC | Sierra 2500 HD | Base; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 2500 HD | Denali; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 2500 HD | SLE; AAM 11.5 / 12.0 |
| 2020-2021 | GMC | Sierra 3500 HD | Base; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 3500 HD | Denali; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 3500 HD | SLE; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 3500 HD | SLT; AAM 11.5 / 12.0 |
| 2020-2023 | Chevrolet | Silverado 3500 HD | High Country; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 2500 HD | AT4; AAM 11.5 / 12.0 |
| 2022-2023 | GMC | Sierra 2500 HD | Pro; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 2500 HD | SLT; AAM 11.5 / 12.0 |
| 2020-2023 | GMC | Sierra 3500 HD | AT4; AAM 11.5 / 12.0 |
| 2022-2023 | GMC | Sierra 3500 HD | Pro; AAM 11.5 / 12.0 |
46-71260B: The current exact manufacturer listing covers 2020-2023 GM Silverado/Sierra 2500 HD and 3500 HD 6.6L gas/diesel with the specified AAM 11.5/12.0 rear axle. The linked older manual is headed 2020. Exact-part named tables extend listed trims through 2023 and distinguish Base 2020-2021 from Pro 2022-2023. Confirm actual axle, housing, brake-line arrangement and boxed revision; no later-model family extension is inferred.
| Detail | Value |
|---|---|
| Manufacturer Part Number | 46-71260B |
| Position / axle | Rear / AAM 11.5 / 12.0 / 12-bolt pattern |
| Finish | Black powder-coating with machined fins |
| Fill plug | 3/4-inch NPT magnetic top fill plug with a 6-inch deep reach and a 1-inch NPT sight glass |
| Fluid level | Use the top fill port and add the correct gear oil until it flows from the side 1/8-inch calibration opening, about 4 quarts in the illustrated manual installation. Use the calibrated level rather than a universal quantity, and verify the correct oil level when an axle has been rotated on a lifted vehicle. |
| Tightening | Tighten mounting screws to 12-16 ft-lb in a crisscross pattern. The exact manual directs NPT fittings to be secured 1.5-3 turns past finger tight without bottoming in the port and calls for Teflon pipe sealant where specified. It does not supply a numeric M12 drain-plug or sway-bar fastener torque; do not borrow another cover’s drain value. |
Explore aFe Power drivetrain parts. Select the exact front and rear covers separately by axle identification.
Black Pro Series cast-aluminum cover for the AAM 11.5 / 12.0 rear axle.
Which axle and model years apply?The current exact manufacturer listing covers 2020-2023 GM Silverado/Sierra 2500 HD and 3500 HD 6.6L gas/diesel with the specified AAM 11.5/12.0 rear axle. The linked older manual is headed 2020. Exact-part named tables extend listed trims through 2023 and distinguish Base 2020-2021 from Pro 2022-2023. Confirm actual axle, housing, brake-line arrangement and boxed revision; no later-model family extension is inferred.
Which fill plug and sight glass are included?3/4-inch npt magnetic top fill plug with a 6-inch deep reach and a 1-inch npt sight glass. The current manufacturer overview calls the sight glass pre-installed, while the exact manual directs applying pipe sealant and installing it in the driver-side port. Confirm the actual boxed assembly before duplicating an already-completed step; either way, the sight glass is included.
Which mounting hardware is supplied?Fourteen short M8 x 1.25 x 30 screws, three longer M8 x 1.25 x 40 screws, seventeen washers and three spacers. Where fitted, restore the brake-line bracket with two longer M8 x 1.25 x 40 screws, two spacers and four washers. Restore the separate cable-retention pad using the third longer screw, remaining spacer and two washers. Use the short screws and remaining washers at the other positions.
Is a new gasket or gear oil included?The exact manual reuses the original OEM gasket; carefully remove and inspect it. A new gasket, RTV silicone, gear-oil fill, axle additive, filter, coupler and tools are not established in the bill of materials. Select the lubricant and additive specification for the actual axle.
How is the correct oil level set?Use the top fill port and add the correct gear oil until it flows from the side 1/8-inch calibration opening, about 4 quarts in the illustrated manual installation. Use the calibrated level rather than a universal quantity, and verify the correct oil level when an axle has been rotated on a lifted vehicle.
What tightening values apply?Tighten mounting screws to 12-16 ft-lb in a crisscross pattern. The exact manual directs NPT fittings to be secured 1.5-3 turns past finger tight without bottoming in the port and calls for Teflon pipe sealant where specified. It does not supply a numeric M12 drain-plug or sway-bar fastener torque; do not borrow another cover’s drain value.
What installation checks are important?Block the tires on a flat dry surface. If the housing has a bottom drain plug, it may be used to begin draining; reinstall it at the manual’s specified stage. Note and remove applicable brake-line brackets and the retention pad, remove all but the top cover bolt to drain, then remove the cover and carefully preserve the gasket. Clean and inspect the sealing face without gouging or rounding it. The GM manual has no Ram coil-spring sway-bar removal step. Restore the GM brake-line bracket and cable-retention pad only where fitted, using its own procedure. Align the OEM gasket and cover, install the locating short screw/washer and restore bracket hardware. Where fitted, restore the brake-line bracket with two longer M8 x 1.25 x 40 screws, two spacers and four washers. Restore the separate cable-retention pad using the third longer screw, remaining spacer and two washers. Use the short screws and remaining washers at the other positions. Tighten the mounting screws in a crisscross pattern, fit the drain plug/crush washer and sight glass as instructed, fill by the calibration port, close the pipe plugs with the specified sealant and inspect clearances and leaks.
Read the current manufacturer listing for 46-71260B and full exact-family installation manual.
Block the tires on a flat dry surface. If the housing has a bottom drain plug, it may be used to begin draining; reinstall it at the manual’s specified stage. Note and remove applicable brake-line brackets and the retention pad, remove all but the top cover bolt to drain, then remove the cover and carefully preserve the gasket. Clean and inspect the sealing face without gouging or rounding it. The GM manual has no Ram coil-spring sway-bar removal step. Restore the GM brake-line bracket and cable-retention pad only where fitted, using its own procedure. Align the OEM gasket and cover, install the locating short screw/washer and restore bracket hardware. Where fitted, restore the brake-line bracket with two longer M8 x 1.25 x 40 screws, two spacers and four washers. Restore the separate cable-retention pad using the third longer screw, remaining spacer and two washers. Use the short screws and remaining washers at the other positions. Tighten the mounting screws in a crisscross pattern, fit the drain plug/crush washer and sight glass as instructed, fill by the calibration port, close the pipe plugs with the specified sealant and inspect clearances and leaks.
Tighten mounting screws to 12-16 ft-lb in a crisscross pattern. The exact manual directs NPT fittings to be secured 1.5-3 turns past finger tight without bottoming in the port and calls for Teflon pipe sealant where specified. It does not supply a numeric M12 drain-plug or sway-bar fastener torque; do not borrow another cover’s drain value.
Use the top fill port and add the correct gear oil until it flows from the side 1/8-inch calibration opening, about 4 quarts in the illustrated manual installation. Use the calibrated level rather than a universal quantity, and verify the correct oil level when an axle has been rotated on a lifted vehicle.
46-71260B: The current manufacturer overview calls the sight glass pre-installed, while the exact manual directs applying pipe sealant and installing it in the driver-side port. Confirm the actual boxed assembly before duplicating an already-completed step; either way, the sight glass is included.
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