Allison 1000 Transmission Problems 2017-2019 Silverado / Sierra 6.6L L5P
2017-2019 Allison 1000 Transmission Problems? A Better Replacement for Silverado / Sierra 6.6L Duramax L5P Trucks
If you landed here searching things like 2017 Allison 1000 slipping while towing, 2018 L5P Allison running hot, or 2019 Silverado Allison 1000 replacement transmission, you are in the right place. BD’s new RoadMaster Allison 1000 package was built for stock or mildly modified Chevy and GMC 6.6L Duramax trucks that need a more reliable answer than a basic rebuild.
Jump to: What Owners Are Really Searching • Why BD's New RoadMaster Matters • Truck Years and Engines • Related BD Allison Upgrades • FAQ
What 2017-2019 Allison 1000 Owners Are Really Trying to Fix
Most customers do not start by searching for a part number. They search by the problem they feel. On these 2017-2019 Chevy Silverado and GMC Sierra 6.6L Duramax L5P trucks, that usually means one of three things.
1) Slip and wear while towing
BD calls this out directly in the RoadMaster feature set. The package uses increased line pressure for less slip and wear while towing, which is exactly the kind of language owners search when the truck starts feeling less stable under load.
2) Heat and fluid temperature control
Hot transmission oil is one of the fastest ways to shorten transmission life. BD addresses this in the RoadMaster itself with a deep aluminum pan for more fluid capacity, and also in the supporting Allison 2017-2019 parts lineup with cooling upgrades and a cooler bypass delete.
3) Converter clutch feel and overall reliability
Converter behavior matters on tow trucks and daily-driven HDs. BD includes a ProForce torque converter in every RoadMaster package, which makes this a real replacement path instead of just a bare transmission swap.
Why BD's New Allison 1000 RoadMaster Is Different
There are a lot of ways to sell a replacement transmission. What matters is whether it actually addresses the weak points that customers complain about. The RoadMaster does not try to be everything for everyone. It is aimed at the owner who wants a stronger, smarter Allison 1000 replacement for a stock or mildly modified L5P truck.
Increased line pressure up to 68%
BD says the modified valve body increases durability and raises clutch pack torque capacity with a boost in line pressure of up to 68%. That is a direct answer to the slip and wear complaints owners feel when towing.
Deep aluminum BD pan
The included deep pan adds an additional 3.5 quarts of fluid, which helps cooler transmission temperatures while towing. More fluid capacity and better thermal control are exactly what these trucks need when the work gets real.
ProForce torque converter included
Every RoadMaster Allison package includes a ProForce torque converter for more reliable converter clutch apply. That makes this a more complete fix path for trucks where converter feel and lockup behavior matter.
Built for stock or mildly modified L5P trucks
This is not positioned as an all-out race build. BD specifically describes the RoadMaster as a reliability-focused package for stock or mildly modified Duramax GM trucks, which is exactly where a huge part of the market sits.
Shop the full product here: BD RoadMaster Allison 1000 Transmission & Converter Package
Truck Years, Models, and Engine This Blog Targets
This blog is aimed squarely at 2017, 2018, and 2019 Chevy Silverado and GMC Sierra 6.6L Duramax L5P trucks shopping for an Allison 1000 replacement or trying to solve the usual towing and temperature complaints with a smarter transmission package.
If you want to browse the platform first, BD has both a full Duramax 6.6L 17-up L5P collection and a dedicated L5P transmission collection where you can shop supporting Allison parts, cooling, flexplate options, and more.
Related BD Allison 1000 Upgrades to Consider While You Are There
If you are replacing the transmission because the truck has been running hot, slipping under tow, or showing signs of converter stress, it makes sense to look at the supporting pieces too.
Cooler Bypass Delete for 2017-2019 Allison
BD built this because debris in the stock cooler bypass valve can jam the internal valve in recirculation mode, which raises transmission temperature and can contribute to premature transmission failure.
Duramax Allison FleX-Plate
BD’s FleX-Plate is a direct bolt-in replacement designed to handle up to 1,500 lb-ft of torque and makes a lot of sense when doing a converter or transmission swap on a working truck.
Xtrude Double Stacked Transmission Cooler
For trucks where temperature control is the main concern, BD’s double stacked Xtrude cooler delivers over 40,000 BTU/HR of cooling and over 350% temperature drop versus the factory system.
Frequently Asked Questions
What trucks is BD's new RoadMaster Allison 1000 for?
This package is built for 2017-2019 Chevrolet Silverado and GMC Sierra 6.6L Duramax trucks using the Allison 1000 platform.
What problems is this transmission package meant to help with?
The product focus is pretty clear: less slip and wear while towing, cooler transmission temperatures, and more reliable converter clutch apply. That lines up with the exact problems most owners search when the stock setup starts feeling stressed.
How much extra fluid capacity does the BD pan add?
BD states the included deep aluminum pan adds an additional 3.5 quarts of fluid to help keep temperatures under control while towing.
Is the RoadMaster meant for race trucks?
No. BD positions this package for stock or mildly modified Duramax GM trucks, with stock clutch counts in the transmission and durability-focused upgrades built around real-world use.
What OEM part numbers does this replace?
BD lists this package as replacing OEM part numbers 19418774, 19418773, and 24266601.
If heat is my biggest complaint, what else should I look at?
Start with the RoadMaster itself, then look closely at the Cooler Bypass Delete and the Xtrude Double Stacked Cooler if temperature control is the main reason you are shopping.
Always verify fitment, current availability, and current warranty on the live product page before ordering.