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95 S_Trucker · 07-02-2018, 04:18 PM

Its built into the instrument cluster on 88-90 models.

Its also referred to as the DRAC module.(digital ratio adapter controller)

91+ trucks have the DRAC separate from the cluster.

07-02-2018, 04:18 PM	#2
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: Trying to find the vsb (vehicle speed buffer). Its built into the instrument cluster on 88-90 models. Its also referred to as the DRAC module.(digital ratio adapter controller) 91+ trucks have the DRAC separate from the cluster.