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MAximum Pro Series Transmission Kit, Allison 1000, LB7, 2001-2004

Designed for use with engines modified above stock or with aftermarket components
Designed for use with engines modified above stock or with aftermarket components
Price Range:   $1,799.00 - $4,709.00
Billet Converter Options: 
Valve Body Options: 
Add Billet C2 Clutch Hub: 
Select Options
Merchant Automotive has a long history of building transmissions for customers from all over the country who depend on their truck for many types of applications. The components in the Maximum transmission kits were selected specifically based on our experience working exclusively on the GM Duramax trucks with an Allison transmission.

Why the Pro Series?

Designed to optimize the potential of the Allison transmission even with additional power.  We take the proven reliability of the 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). Includes everything you need to not only upgrade the transmission, but rebuild it as well.  A truly complete kit to get you back on the road worry free.

Kit includes
  • C1-C5 frictions with improved material and increased apply area
  • C1-C5 Steels
  • LML pistons and springs decreases deflection of C3 apply plate
  • Hydraulic improvements to increase and maintain line pressure which increase clutch pack clamping force and improves convertor holding power.
  • Smoother apply into drive from park or reverse
  • Increased C2 clutch apply pressure improves 5th gear holding capacity
  • Complete gasket and seal kit
  • All new genuine Allison Torrington bearings
  • Select bushings common for wear
  • Deep pan (increases capacity)
  • Allison spin on filter
  • New style deep pan filter with increased filtration capacity and lower flow resctriction
  • Filter lock to ensure filter maintains seal preventing leaks and pressure loss
  • Genuine Allison Pressure Switch, latest design for maximum durability
  • Wire harness connector body and seal to repair common issues and prevent leaks
  • Pressure Regulator Spring Service Tool
<: Fitment Chevrolet 2001 2002 2003 2004 GMC 2500HD 3500 Chevy 01 02 03 04 Duramax GM 3/4 1 ton Silverado Sierra Allison 1000 :>

Transfer MORE POWER to the ground with improved torque efficiency
Fully furnace brazed pump and turbine assemble\Steel drive splines
Heavy Duty Torrington enclosed needle bearings
Electronically balanced
Lower operating transmission temperatures
Numerous stall speed combinations available to best suit your vehicle and driving habits
Single disc lock-up design using Raybestos clutch linings
Increase fuel mileage 1 to 3 mpg in most cases
Billet steel front cover
MAximum Valve Body

MAximum Valve Bodies are disassembled and ultrasonic cleaned to remove all debris.
Upgraded to support increased line pressure.
Improvements for smoother apply into Drive from Park or Reverse.
New Genuine Allison Pressure Switch.
New Genuine Allison Wire Harness.
Dyno tested to ensure quality control standards


Billet C2 Hub

Install this new billet steel clutch hub to address the failure of the stock C-2 clutch hub in high torque/horsepower applications

Machined P1 Sun Gear included with Bilet C2 Hub add on.

•Made from 4140 HTSR billet steel.
•Spline is lengthened .125" for more contact, plus a spline boss diameter increase of .100" for added strength.
•No weight penalty for strength. The TCS hub is only 2.8oz. heavier than the O.E.M. part.
•Comes with a modified thrust washer.

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