The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.

HomeShop by DepartmentPerformanceTransmissionsRebuild KitsSuncoast Category 1 500HP Custom Allison Rebuild Kit (WITH CONVERTER) - GM Duramax LBZ/LMM

Suncoast Category 1 500HP Custom Allison Rebuild Kit (WITH CONVERTER) - GM Duramax LBZ/LMM

Thoroughbred Sku #: SUNGMAX-CAT1-LBZ/LMM-KIT-CRE

Your Selected Vehicle Does Not Fit, Please Select a Vehicle

Select a Vehicle

Selected Vehicle

Select Vehicle

Year/Make/Model: {{year}} {{make.Name}} {{model.Name}} Edit

PAYMENT NOTE: If you choose Pay Core Later, from the Core option below, you will not be able to pay for this order using Affirm or PayPal

$4,295.00

* Core Exchange Option:

Terms & Conditions for Cores

Many stock replacement parts such as turbos, injectors, injection pumps, and high pressure oil pumps have a core charge that is associated with the new replacement part. You must return the old part to receive a refund on the core charge.

In some cases, the core is not reusable, such as in the event of a cracked case, at which point the core deposit would not be credited as the core component is not reusable.
Cores that have been disassembled and/or have missing and/or damaged major components will not receive full core credit.
Returned cores must be on a "like-for-like" basis, meaning that the returned core has the exact same fitment as the remanufactured component that was purchased. If the core is not "like-for-like," your core may not be eligible for return/credit.
You are responsible for core return shipping cost.

If you plan on returning your core you have two options.

Thoroughbred Diesel offers defer the upfront core charge when purchasing via credit card payment.

OPTION 1: You can accept the core charge, which means you will be charged for the part AND the core at time of purchase. You still have the option to send it back, and if you do, the core will be refunded back on the card used, presuming the core meets core criteria and the core is returned within 30 days from the time your order is received. If you return your core after 30 days you may refer to the Core Charge Timeline below as to how you will be refunded.

Core Charge Timeline

If the core is returned after 30 days, 90% of the core will be refunded.
If the core is returned after 60 days, 70% of the core will be refunded.
If the core is returned after 90 days, 50% of the core will be refunded.
After 6 months cores will be accepted at Thoroughbred’s discretion.

OPTION 2: You can defer the core charge. If you defer, you will not be charged for the core at the time of purchase. You will have 21 days from the time your order is received to send the core back. If the core is not received within the 21 days, your credit card will be charged for the core amount on your order. If you return your core after 21 days, you may refer to the Core Charge Timeline below as to how you will be refunded. When Core deferral (Pay Core Charge Later) is limited to payment by credit card only. ***When using PayPal or Affirm as your method of payment “Core Deferral (Pay Core Charge Later)” is not available. The core must be paid at time of purchase. ***

Core Charge Timeline

If the core is returned after 21 days, 90% of the core will be refunded.
If the core is returned after 60 days, 70% of the core will be refunded.
If the core is returned after 90 days, 50% of the core will be refunded.
After 6 months cores will be accepted at Thoroughbred’s discretion.

Core Return Procedure

Please keep all original packaging of your new item to be used for the core return.
Drain all fluids: oil, fuel, etc. out of the core before it is returned.
Place any plastic plugs or caps received on the new item back onto the core.
To insure UPS, Fed Ex, or USPS will not reject the package due to fuel or oil leakage, please wrap the core in a plastic garbage bag.
Place core inside the box.
If core return paperwork was inside the box, please complete the form and send back with the core.
Please provide a tracking number to [email protected]. Without a confirmed tracking number we cannot guarantee your core refund
If you have questions please call our core department 859-737-4966 ext. 5

I have read and I accept the terms and conditions.

Applications:

View All applications

VERIFY VEHICLE FIT

QTY:

Product Details
Youtube Videos
Reviews
Questions & Answers

Product Details

Product Name: Suncoast Category 1 500HP Custom Allison Rebuild Kit With Converter
Manufacturer: Suncoast
Manufacturer Part #: GMAX-CAT1-LBZ/LMM-KIT
Thoroughbred Diesel Part #: SUNGMAX-CAT1-LBZ/LMM-KIT
Fitment Notes: GM Duramax LBZ/LMM

The SunCoast Category transmissions utilize the latest proven friction materials and steel technology from industry leading companies such as Alto and Raybestos. SunCoast works directly with these companies to design and manufacture proprietary SunCoast exclusive product lines, giving the end user uncompromised quality throughout the entire transmission.

SunCoast has designed these kits in house to exact specifications for many in tents, including but not limited to towing, sled pulling, racing or simply having a vehicle to get from point A to point B.

Designed for light commercial vehicles in both on highway and public transport applications, Allison Transmission's 1000 and 2000 Series are rated up to 400 horsepower from the factory. Allison 5-speed transmission started in 2001 with GM equipped Duramax engines.

Kit Exclusives:

SunCoast proprietary C1, C2, C3, and C4 Alto carbonite frictions/Rabestos SCZ frictions that contain no center slots. These 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. This custom piston allows us to use a thicker spring apply plate which replaces the thin OEM one that will cone and 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.

The Torque Converter

SunCoast Allison 1000 torque converters come in many varieties, from heavy hauling, sled pulling, drag racing, to daily driving. Here at SunCoast we design and manufacture all of our torque converters in house. Because of this unique advantage SunCoast can supply almost any request in regards to stall speed or torque multiplication. All of our SunCoast Allison triple disc converters are outfitted with a heavy Duty forged billet steel cover and give unbeatable lock up performance.

All of the SunCoast Allison 1000 torque converters come standard with custom pump and turbine modifications (in house). SunCoast also Tig Welds each individual furnace brazed fin for improved reinforcement. The SunCoast Allison billet triple disc converter also comes standard with our proprietary trapezoidal clutch teeth.

New internal wiring harness

Every build here at SunCoast reliability is our number one priority. Each one of our (Category) Allison rebuild kits comes with a new internal wiring harness. As the transmission continues to age, the plastic connectors become brittle and will break during disassembly. This often leaves builders scrambling around looking for a replacement last minute. This is a new GM harness with all new connectors.

The Category Kits

SunCoast Category kits offer our customer the same recipes as our in house builds that have been proven for years both at the track and on the road. Our Category 1 Allison rebuild kit offers the customer our 500 horsepower Allison rebuild. This rebuild kit includes everything you will need to build your Allison the same we we build here in house. This Allison rebuild kit also includes detailed instructions that will walk you through each step of the process.

Suncoast Category 1 500HP Custom Allison Rebuild Kit With Converter Features:

SunCoast custom clutch packs
SunCoast custom Steels
SunCoast custom billet plates
SunCoast custom overhaul kit
Valve body calibration kit
SunCoast gasket kit
Pan Filter
Spin on filter
Pan gasket
SunCoast Filter Loc
New internal wiring harness
SunCoast Triple Disc Billet Category 1 Converter
Have questions on Suncoast Category 1 500HP Custom Allison Rebuild Kit With Converter for your GM Duramax LBZ/LMM diesel? Call us at 1-859-737-4966 if you need advice or help finding what you're looking for.

Reviews

Submit a question

how do u know which piston goes where when u are building a Allison transmission

Adam | 12/13/2021
Get with a transmission rebuilder or YouTube video’s.

Diesel Performance Products & Parts

Diesel Truck Stock Replacement Parts | OEM Parts

Tractor Parts | Tractor Injectors, Injection Pumps, Turbos

Custom Truck Accessories - Tonneau Covers, Nerf Bars & More

Gooseneck & Fifth Wheel Hitches | Truck Towing Products

Thoroughbred Diesel Shirts, Hats, License Plates