SunCoast Category 2 Allison 600HP Rebuild Kit w/Converter, 2011-2016 LML


$6,495.00 Includes Free Shipping. +$450.00 core charge (refundable)

WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov

Fits: 2011 thru 2016 Chevy Silverado/GMC Sierra 2500HD/3500HD LML Duramax Diesel

SunCoast Category 2 kits offer the same recipes as their in house builds that have been proven for years both at the track and on the road. This rebuild kit includes everything you will need to build your Allison the same way SunCoast builds them in house, including detailed instructions that will walk you through each step of the process. These kits utilize the latest proven friction materials and steel technology from industry leading companies such as Alto and Raybestos. This kit is best suited for daily driver/tow/street/strip applications with some modifications done to the truck.


  • Custom clutches & steel
  • Custom billet plates
  • Custom overhaul kit
  • Valvebody calibration kit
  • Gasket kit
  • Internal Filter
  • Spin on filter
  • Pan gasket
  • SunCoast Filter "Loc"
  • Modified Sun Gear
  • New internal wiring harness
  • Sleeved C2 Clutch Hub
  • Billet SFI certified Flexplate
  • Billet Input Shaft
  • SunCoast Triple Disc Billet Converter, stall speed of your choice

Kit Features:

  • SunCoast proprietary C1, C2, C3, and C4 Alto carbonite frictions/Raybestos SCZ frictions that contain no center slots
  • Frictions utilize a waffle pattern in the material to help retain oil helping the clutch cool when not applied.
  • Redesigned apply pistons with improved rubber compounds proven to hold higher heat
  • Allows use of thicker spring apply plate which replaces the thin OEM one that will cone & cause uneven apply surface resulting in premature clutch failure
  • Custom SunCoast apply plate that redirects fluid to better lubricate frictions from the inside out which lubes the entire friction rather than OEM style that lubricates from the center out leaving the inner half of the clutch burnt.
  • Includes exclusive smart trim / clutch control valve.
  • Includes all items needed to modify the C2 clutch piston for increased clutch durability.

Converter Features:

  • Custom, in-house pump and turbine modifications
  • Proprietary converter clutches with trapezoid clutch teeth (no round tabs)
  • Forged billet cover strength
  • 3 year unlimited mileage warranty


This SunCoast Allison billet SFI certified billet flexplate replaces the factory flex plate with an improved billet steel one piece design, eliminating the weak factory flex plate. A must for high torque in conjunction with a better designed torque converter that can transfer torque with no slip. This one piece billet flex plate is SFI certified to 29.3.

Input Shaft:

The input shaft is the first thing to go south in the Allison transmission. This billet input shaft is built to withstand everything you can throw at it. Manufactured from 9310 Vacumelt steel which increases torsional fatigue strength by over 50%. Also, the billet input shaft is machined with a larger radius at the turbine spline for added strength. This is a must for vehicles that are lifted with larger wheels and tires, heavy towing/hauling, and vehicles with aftermarket turbos.

C2 Hub:

The C2 hub is known for fracture on the Allison transmissions. The C2 hub is equipped with a billet steel 4140 sleeve. This billet sleeve reduces the likelihood of any failures up to 600 horsepower.


  • Core charge is for torque converter & sun gear
  • C5 clutches are not included
  • If non-factory stall speed converter is chosen, other internal modifications may be recommended accordingly to your application
  • Photos may not depict actual products included in kit

Customer Reviews

Be the first to write a review