Can you use a Drac on a vssb speedometer?
Can you use a Drac on a vssb speedometer?
Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module. Both look VERY similar. The early DRAC used a 7 pin layout and the 1994-1995 VSSB used 14 pins. You can use a 14 pin VSSB as a replacement for a DRAC but not the other way around.
Why are GM Drac and vssb modules no longer supported?
DRAC and VSSB Modules fail in several ways and contribute to other systems malfunctioning on the vehicle. We offer working solutions to OE application modules due to these modules no longer being supported or available from GM over the counter for most applications.
When do you need a Drac module in a car?
Programming the DRAC module will be necessary if changing tire diameter or final gear ratios. Otherwise the speedometer will not read correctly and the engine computer will not sense the correct vehicle speed. After locating and removing the module from the vehicle, carefully open the plastic case and remove the circuit board.
What are pigtails for Drac and vssb modules?
Pigtails from used clippings to new connections for repair, Vehicle Speed Sensor (VSS) pigtails for various known OE sender applications. Mounting parts for DRAC and VSSB Modules in OEM repair usage and adaptations. OE mounting brackets for mounting modules and fastners used with mounting DRAC and VSSB module enclosures.
Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module. Both look VERY similar. The early DRAC used a 7 pin layout and the 1994-1995 VSSB used 14 pins. You can use a 14 pin VSSB as a replacement for a DRAC but not the other way around.
Programming the DRAC module will be necessary if changing tire diameter or final gear ratios. Otherwise the speedometer will not read correctly and the engine computer will not sense the correct vehicle speed. After locating and removing the module from the vehicle, carefully open the plastic case and remove the circuit board.
What was the vssb / Drac module used for?
The external VSSB/DRAC (Vehicle Speed Sensor Buffer / Digital Ratio Adapter Controller) module was used in 1989-1995 General Motors vehicles in many applications. Before this point a cable-drive speedometer was used, while afterwards the DRAC was incorporated into the speedometer itself, then later the vehicle computer unit.
When to use DIP switch on GM Drac module?
Select this module for a user-calibratable module equipped with DIP Switches. This is for when you want to keep your OE module and calibrate it for yourself for your own custom application. This module undergoes the same testing and verification as our other service modules.
