ATS 301-900-4248 Allison Extra Deep Pan for 2001-2018 GM 2500/3500 6.6L Duramax

Vehicle Fitment

• 2001-2018 Chevrolet Silverado 2500HD/3500HD (6.6L Duramax, Allison LCT1000/LCT2000 Automatic)
• 2001-2018 GMC Sierra 2500HD/3500HD (6.6L Duramax, Allison LCT1000/LCT2000 Automatic)

Fitment Notes

• Covers LB7, LLY, LBZ, LMM, LML, and early L5P Duramax engine generations equipped with the Allison LCT1000/LCT2000 automatic transmission
• Gasket is not included; a compatible pan gasket must be sourced separately for installation
• A deep-pan-specific transmission filter is required at install and is included with this pan
• An optional reusable gasket is available separately at additional cost

Features

• Increases transmission fluid capacity by 5 extra quarts over the stock pan
• Deeper fluid reservoir helps lower transmission operating temperature
• Cast aluminum construction with black powder-coat finish for corrosion resistance
• Magnetic 1-inch drain plug captures metal debris during fluid changes
• Pre-tapped provision for an optional transmission temperature sensor
• Finned exterior design improves heat dissipation
• Adds structural rigidity to the transmission case
• Machined ATS logo and fin detailing on the pan exterior
• Designed as a direct-fit upgrade requiring no transmission modification

Specifications

• Fluid capacity increase: +5 quarts over stock pan
• Drain plug: Magnetic, 1-inch, lower position
• Material/finish: Cast aluminum, black powder-coat
• Transmission compatibility: Allison LCT1000 / LCT2000
• Sensor provision: Pre-tapped for transmission temperature probe
• Part Number: 301-900-4248

Included Components

• 1x ATS Extra Deep Transmission Pan
• 1x Deep-pan transmission filter
• 1x Installation hardware set

Product Description

The ATS Extra Deep Transmission Pan replaces the factory Allison transmission pan on 2001-2018 GM 2500HD/3500HD trucks running the 6.6L Duramax, adding five additional quarts of fluid capacity to help the transmission run cooler under load. Lower operating temperatures reduce heat-related stress on the clutch packs and internal components, which matters most for trucks that tow, haul, or spend extended time working under heavy load.

Built from cast aluminum and finished in black powder coat, the pan's finned exterior adds surface area for heat dissipation while a magnetic 1-inch drain plug helps trap metal debris during routine fluid changes. The pan also includes a pre-tapped provision for an optional temperature sensor, giving owners a way to monitor transmission temps directly if they choose to add a gauge later.

This pan is intended for owners looking to improve long-term transmission durability without a full transmission rebuild - a straightforward, direct-fit upgrade for daily drivers, tow rigs, and work trucks alike. Since the gasket is sold separately, plan to have a compatible pan gasket on hand before installation, along with the appropriate deep-pan filter (included) for the fluid change.