10-19 Silverado Sierra 2500 3500 6.6L Allison Transmission Extension H

10-19 Silverado Sierra 2500 3500 6.6L Allison Transmission Extension Housing 422

$275.49
Sale price  $275.49 Regular price 
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10-19 Silverado Sierra 2500 3500 6.6L Allison Transmission Extension H

10-19 Silverado Sierra 2500 3500 6.6L Allison Transmission Extension Housing 422

$275.49
Sale price  $275.49 Regular price 
Item Details
Brand: Chevrolet, GM
Interchange Part Number: LML, L5P DuramaxAllison 1000 Trans 4x4 4WD AWDT1000 Tailshaft
Transmission Speeds: 6
Manufacturer Part Number: 24257849
ID: MJC 2605422
Importapart: 314-502-3104
Country of Origin: United States
condition_description: Fits 2010-2019 Chevrolet Silverado 2500HD/3500HD and 2010-2019 GMC Sierra 2500HD/3500HD with 6.6L Duramax engine, Allison 6-speed automatic transmission, and four-wheel drive (4x4) ONLY.
Estimated Shipping Enter your ZIP for a shipping estimate.

Item Description

10-19 Silverado Sierra 2500 3500 6.6L Allison Transmission Extension Housing 422



Transmission extension housing from a 2012 Chevrolet Silverado 2500HD with 6.6L Duramax engine, Allison 6-speed automatic transmission, and 4x4. This was carefully removed from a core transmission and is in good condition. The exterior aluminum surfaces have minor corrosion from age, but no broken or damaged parts. All holes and threads are in good condition. The output shaft bearing spins freely and seems to be in fine condition. The images are of the actual part you will receive.

Fits 2010-2019 Chevrolet Silverado 2500HD/3500HD and 2010-2019 GMC Sierra 2500HD/3500HD with 6.6L Duramax engine, Allison 6-speed automatic transmission, and four-wheel drive (4x4) ONLY.

No shipping outside the lower 48 states. No P.O. Boxes.

See the Compatible Vehicles table below for full fitment details.

Importapart is an auto recycler based in Hazelwood, Missouri. Every part we sell is a real, inspected OEM piece pulled from our own inventory — no aftermarket guesswork.

Questions on fitment or availability? Email Importapartsales@gmail.com or reach us through our contact page and we’ll get back to you within one to two business days. Hours are Mon–Fri, 9am–5pm CST.

We accept all major credit and debit cards and the other payment methods shown at checkout, processed securely through Shopify. Payment is due in full at the time of purchase, and sales tax is applied where required.

For programmed ECU/ECM/PCM orders, be sure to submit your VIN, odometer reading, and current part number at checkout so we can program the unit before it ships.

We ship to all 50 states. Most orders leave our Hazelwood, MO shop within 1–2 business days by FedEx, UPS, or USPS, and you’ll get tracking by email as soon as it’s on the way.

Heavy items like engines, transmissions, and body panels may ship freight — we note that on the listing when it applies. Alaska and Hawaii have a flat-rate surcharge calculated at checkout. We don’t ship to PO Boxes or outside the U.S.

Local pickup is available at our Hazelwood facility by appointment — call ahead to set a time.

Read the full shipping policy →

Returns are accepted within 60 days. A 20% restocking fee applies to standard returns, but it’s waived if we sent the wrong part, it arrived damaged, or it’s verified defective. Inspect your order on arrival and contact us within 7 days in those cases — we cover return shipping.

Programmed ECU/ECM/PCM modules are returnable only if defective, damaged, or incorrect. Because each one is programmed to the VIN you provide, we can’t take them back for compatibility issues from an incorrect VIN, odometer, or part number — double-check before you order.

Approved refunds are issued to your original payment method within 10 business days.

Read the full return policy →

Every part carries a 60-day limited warranty against defects from the date it’s delivered. It covers manufacturing defects, parts that fail to function as described, and internal mechanical or electrical failure under normal use.

Not covered: damage from improper installation, accident, misuse, or modification; normal wear and tear; labor, towing, or rental costs; racing, off-road, or commercial use unless stated; and items with broken warranty seals.

To file a claim, email Importapartsales@gmail.com with your order number, a description of the problem, and photos or video if possible. We’ll respond within one business day.

Read the full warranty policy →

Compatible Vehicles

Notes Make Model Year Trim Engine
Chevrolet silverado 2500 hd 2019 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2019 wt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 lt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 lt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 wt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 wt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2019 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 base extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 base standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 sle extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2019 slt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 base cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 base cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 denali cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 sle cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 sle cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2019 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 lt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 ltz extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2018 wt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 lt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 lt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 lt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 ltz extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 wt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 wt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2018 wt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 base extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 base standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 sle extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 sle standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2018 slt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 base cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 base cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 base extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 base standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 sle cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 sle cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 sle extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 sle standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2018 slt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 lt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 ltz extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2017 wt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 lt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 lt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 lt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 ltz extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 wt cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 wt cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 3500 hd 2017 wt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 base extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 base standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 sle extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 sle standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 2500 hd 2017 slt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 base cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 base cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 base crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 base extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 base standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 denali crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 sle cab & chassis 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 sle cab & chassis 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 sle crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 sle extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 sle standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 slt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Gmc sierra 3500 hd 2017 slt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 high country crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 lt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 lt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 lt standard cab pickup 2-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 ltz crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 ltz extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 wt crew cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged
Chevrolet silverado 2500 hd 2016 wt extended cab pickup 4-door 6.6l 6599cc 403cu. in. v8 diesel ohv turbocharged