Modifications to a car, pick - up truck, van, motorcycle, or moped can affect its registration class. Important : The DMV cannot examine your vehicle to determine the correct registration class. You must determine the correct registration class for your vehicle. 

Modifications to a motorcycle or moped, including Limited Use Motorcycles- 
If you remove a speed governor that was originally installed to limit the top speed of a moped or add a speed governor that limits the top speed of a moped or motorcycle , you must notify DMV and register the moped or motorcycle in the appropriate class [1]. 

Modifications to cars, pick-up trucks, and vans 
Part 106 of DMV Regulations describes the vehicles that are registered in the' Commercial' class and in the passenger class. Part 106 also describes how some modifications that you make to your vehicle can affect the correct registration class of your vehicle. A description of the modifications appears below. Each description includes a reference to the DMV Regulations [2]. For all vehicle modifications , you must obtain a vehicle weight slip. You can get vehicle weight slips at most vehicle and/or metal scrapyards and from some auto - parts stores and mechanics, especially those specializing in vehicle modifications and camper body / equipment sales and installation. 

Modifications that change a registration from 'Passenger' class to 'Commercial' class 


Cars (Part 106.2 (e)) 
You can register a car in the' Commercial' class if all the seats behind the driver are removed. Instead of the seats , you must install a permanent box or permanent rack to carry cargo. 

Station Wagons and Vans (Part 106.2 (f)) 
You can register a station wagon in the' Commercial' class if all the seats and all the seat fittings behind the driver are removed completely. 

Modifications that change a registration from 'Commercial' class to 'Passenger' class 


Pick-up Trucks (Part 106.6 (b) and (c)) 
You can register a pick - up in the' Passenger' cla

user: II want to make some modifications to my truck and want to know if it will affect it's registration class.

assistant: Yes, some modifications could affect your vehicle's registration class. 

assistant: Have you already made modifications to your truck?

user: Yeah, I'm in the process of modifying the exterior of my truck.

assistant: In this case, you will need to get a vehicle weight slip. These can be obtained at the majority of vehicle and metal scrapyards. 

user: How do I know if my modifications will change the class of my truck?

assistant: Your vehicle can remain in the passenger class if it meets certain criteria and unladen weight requirements.

assistant: Does your truck have an unladen weight of less than 6,001 lbs.?

user: No, my truck weighs more than that.

user: Does this mean that I can't register it in the passenger class?

assistant: Although your truck weighs more than 6,000 lbs, you can still register it in the passenger class, if it's not being used exclusively for commercial purposes, does display any business ads, has a camper top that has one or more side windows completely enclosed, and has seats, seat fittings, and/or camping equipment installed in the bed.