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Module Missing OE Label Replacement Option


Looking for a Replacement DRAC VSSB Module and the factory identification label is missing?

This is not a problem, this page provides the solution. Due to varying selections of modules the factory could have used we find it best to create a new replacement that matches your vehicles current configuration (even if the tire size has changed from factory). Replacement modules are sold as calibrated modules based on Gear Ratio and Tire Size.

Gear Ratio

To find your vehicle's Rear End (differential) gear ratio, the RPO codes list in your glove box is the easiest way. This is the sticker inside the box with a lot of 3-character codes. Find the gear code, this is typically GU4 (3.08) GU6 (3.42) GT4 (3.73) and GT5 (4.10) being the most common. Another method, you can call a GM Dealer's service department and provide them with the last-eight digits of your VIN and they can tell you the factory build gear ratio. Optionally, you can contact UD Module and provide a picture of the RPO codes list and or the VIN and we can decode for use on a module purchase.

Tire Size

Check the current tire size on the vehice. The absolutely preferred tire size measurement will be to use the P-Metric size on the sidewall. For example: 245/75 R16, please do not provide an estimated tire size diameter when a P-Metric or true size (like 33x12.5 R15) is available as this greatly affects accuracy of calibration.

Please use the forms below to purchase your replacement.


Calibration on Gear Ratio and Tire Size for Missing Label Module

Please fill out the information on the form completely.

For DRAC Type, select the range that best fits your vehicles actual year. We will compare the selection to the vehicle information you supply and select the correct module if a difference occurs.

If in doubt about what you need to enter, contact us and we'll walk you though it. Taking a picture of the inside of the module will help as well.

  • $10 Core Charge (shows as Handling) applies

  • DRAC Type Setting Quality $119
    Year, Model, Series, Engine
    1995 Suburban K2500 6.5 Diesel
    Tire Size Gear Ratio
    245 75 R16 4.10


    This module will be shipped out next day via USPS Priority Mail.

    USPS Express Mail & International Priority Mail available at checkout.


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