Merchant Automotive MAximum Pro Series Allison 1000 Transmission 03-04 6.6L GM Duramax LB7
SKU: 53924626782

Merchant Automotive MAximum Pro Series Allison 1000 Transmission 03-04 6.6L GM Duramax LB7

Sale price$2699.55 Regular price$2999.50
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 7 - Jul 12

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Description

Merchant Automotive MAximum Pro Series Allison 1000 Transmission 03-04 6.6L GM Duramax LB7It's true, the Allison 1000 transmission originally set the bar pretty high upon its initial unveiling on the first Duramax equipped Chevy back in 2001. Many looked to this transmission as being the cure for any future transmission issues. And to some degree, the Allisons have proven themselves, but as with all things, time, hard work, and horsepower will cause them to fatigue and fail. Fortunately, the professionals at Merchant Automotive know the

It's true, the Allison 1000 transmission originally set the bar pretty high upon its initial unveiling on the first Duramax-equipped Chevy back in 2001. Many looked to this transmission as being the cure for any future transmission issues. And to some degree, the Allisons have proven themselves, but as with all things, time, hard work, and horsepower will cause them to fatigue and fail. Fortunately, the professionals at Merchant Automotive know the ins and outs of properly building an Allison to deliver the reliability you need from your truck.

Merchant Automotive has a long history of building transmissions for customers from all over the country who depend on their trucks for many types of applications. The components in the Maximum Transmissions were selected specifically based on our experience working exclusively on the GM Duramax trucks with an Allison transmission.

Designed to optimize the potential of the Allison transmission even with additional power, the professionals at Merchant Automotive take the proven reliability of their Work Series and increase capacity even more with additional clutch apply area, heavy-duty friction material, and additional hydraulic pressure to ensure maximum holding capacity. For use with engines modified above stock, or aftermarket components (proper tuning and gearing required).

WARRANTY INFORMATION:
  • Two Year, Unlimited Mileage Warranty

CORE RETURN INFORMATION: You will be required to return your original transmission to Merchant Automotive to receive your core deposit back. Your transmission must match the product purchased (model and year) and be assembled. A completely good transmission will get you a full core refund. However, it is understood that you may have some missing parts and/or damage and we would like to get you as much of a refund as we can for the good usable parts.

Below are examples of items that may reduce the maximum credit:
  • Damaged or missing bell housing $300
  • Damaged or missing rear housing $300
  • Damaged or missing planetary $600
  • Unassembled core $200
  • Missing convertor $200
IMPORTANT FREIGHT NOTE:
The Required Shipping Charge Includes The Return Shipping of the Core Pickup 
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 53924626782

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TheGrandSyphor
Port Orchard, US
★★★★★ 5
Can’t go wrong with K&N
Size: 9.6" x 11.1" x 2.2"
So I recently took my pickup in to have some recall work done, half way through the process I got a call from the dealership stating I needed a new air filter and that a new one would cost nearly $60. I chuckled and told then to put the old one back in and I immediately came to Amazon and ordered this cabin filter. I’ve used K&N products in the past and have never been sorry, and that is the case with this lifetime filter. Upon installing this filter I noticed an IMMEDIATE difference in air flow into the cabin, it even smelled better. If this filter ever gets dirty Ira easy to clean and reinstall, paying for itself over time. Do yourself a favor and pick one of these up, you will not be sorry.
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Reviewed in the United States on October 20, 2025
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Verified Purchase
Perfect condition strong material
New York, US
★★★★★ 5
Perfect fit
Size: 9.6" x 11.1" x 2.2"
Perfect fit on my 2022 jeep wagoner
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Reviewed in the United States on May 20, 2026
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Robert
Natrona Heights, US
★★★★★ 5
Fit my Subaru Forester perfectly!
This fit my 2024 Subaru Forester perfectly. The filters exhibited a high quality construction and was packaged well. Installation was easy and saved me a lot of $ vs. having my dealer install an OEM filter.
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Reviewed in the United States on December 16, 2025
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Jeremiah
Waukegan, US
★★★★★ 5
Good Fit
I don’t expect this filter to last as long as the original filter but that’s okay because it is about half the cost. It looks well made. I didn’t see any flaws. I chose this filter because it had some of the fewest complaints regarding the fit and it worked well for my ‘23 Subaru Forester. I may go back to an OEM filter next time but it’s nice to know that this one will work for me.
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Reviewed in the United States on April 30, 2026
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Verified Purchase
John Appleseed
Boise, US
★★★★★ 5
Fits as advertised
Good item
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Reviewed in the United States on May 11, 2026

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