I thought I read this was not CA smog legal. I don't see that disclaimer anymore. If it's not CA smog legal then I need to keep my old TCM and swap out every 4-years. This will make a difference price wise buying now or saving more money for the upgrade. ( Troy, 02/13/2025 )

The GradeBrake is California legal as it doesn't make any changes to the engine.

Can you tell me if my check has the grade brake by checking the vin? ( Debra Dutra, 09/07/2021 )

Hello Debra , I checked your VIN , Your coach did not come with the Grade Brake . (Model Year 2001-2004 Workhorse W20 & W22 chassis were not equipped from the factory with the Allison Grade Brake feature.)

Does this work with the Silverado/Sierra Model Allison as well? I specifically have the 8.1L with the Allison. ( Joe, 03/28/2019 )

No this is designed only for the Workhorse chassis. I do believe your truck should function very similarly with it in tow/haul mode.

Is it possible to view the installation instructions prior to purchase? Does the product require more ability than the average DIY install? ( Tod Conrad, 06/20/2016 )

Not answered yet.

Can the installation instructions be viewed before the purchase? Is this a complex procedure to install? ( Tod Conrad, 06/20/2016 )

Not answered yet.