1991 S10 Drac, In 1990 improvements were made to the 2. 41989 Chevrolet Blazer 4. 4. For 1995 and Later, See Below: Remove Your Glovebox. There are 17 1991 Chevrolet S-10 Pickup for sale right now - Follow the Market and get notified with new listings and sale prices. I have changed the speed sensor (which still leaks trans fluid through the plug) and that didn't help. . I The A/C pulse comes from the VSS to the DRAC, from the DRAC to the ECM and cruise module Etc. 3 out of a 1992 and changed wiring harness i noticed there was some changes between 91 and 92 i have everything working but the speedo can someone explain the wiring or do they have a complete schematic for the 1991 truck i have one but it doesnt go into detail about the DRAC. Earlier (1987-1989) Full-size trucks use a program-mable DRAC that is incorporated into the instrument panel. Will sometimes bounce from zero to present speed & then drops back to zero & stays. the truck run pretty good for being that old. ) The original Speedometer died completely few months ago (but Subscribed 70 11K views 6 years ago Location of the VSSB/DRAC Module in a 1992 Chevy 1500more '91 s-10, 4x4, auto, 4. I put the ECM back and now have a speedo but the fuel level gauge and volt gauge do not work. OE DRAC VSSB GM Speedometer Module Replacement 1989-2002 Mixed applications 6. Hood and See 24 user reviews, 69 photos and great deals for 1991 Chevrolet S-10 Blazer. Both look VERY similar. (It's an 80mph analog "rainbow / arch" format. 5 had a TBI setup, there were two differant TBI's: model 300 tbi (earlier 2. 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. 5's) and model 700 tbi (later 2. The early DRAC used a 7 pin layout and the 1994-1995 VSSB used 14 pins. 5 liter /4l60e from 1993 in an extended cab truck. I have a carbureted motor that im currently cleaning up and my peedometer gauge already is broken drac signal checked out 1989 Chevrolet Blazer 3. My speedometer DRAC module information The external VSSB/DRAC (Vehicle Speed Sensor Buffer / Digital Ratio Adapter Controller) module was used in 1989-1995 General Motors vehicles in many applications. Fast Online Catalog. In what way are the brakes acting up? I'll have a look at the 1991 wiring diagrams later. I took the dash apart to fix some issues and when I put it back together I left the ECM out thinking I did not need it. The ECM is right under/behind the glovebox. 10 gears 200K miles I can build an entire Chevy for you with just a 9/16" wrench Electrical problem 1991 Chevy S-10 4 cyl Two Wheel Drive Automatic I just bought a 91 s10 for my son. 2 Reply Like distantreality Discussion starter 56 posts · Joined 2010 VSSB DRAC CALIBRATION Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module. 3l v6. Oct 24, 2024 · All the DRAC information that I have was so that I could install Dip switches so that I could get it close as possible to the gear ratio that I'm going to be running in my blazer. G80 3:42 rear, bunch of other good parts. On 95 and earlier General Motors trucks a Digital Ratio Adapter Controller (DRAC) is used to pre-process VSS signals before they get to the ECM. 3 liter 4l60 lm4 out of an envoy. (Moonies are inside the cluster, the needle gauge of '90-91', i think is under the dash like the '92-94) But no, it is not cable Click to expand Speedometer failure and inaccurate speed readings often occur after DRAC module installation in vehicles. Some 1991 and all 1992-1995 trucks calibrate the speedometer using either a DRAC or VSSB module. 3L TBI w/auto tranny. Rated 4. I know the DRAC controls ABS brakes , cruise control and speedometer. 5l engine, this is where the OE DRAC VSSB GM Speedometer Module Replacement 1989-2002 Mixed applications 6. 3 Edelbrock equipped 2003 Chevrolet S10 4. 3 L engine. I found that it does not have a cable, and that it is controlled by a sensor. The 4. The truck is a 1991 s10 regular cab shortbox 2. 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. This guide WILL ONLY WORK FOR 1989-1994 MODELS!* Chevy Forums FREE technical assistance for your restoration and repair. 3 auto runs pretty good. May 31, 2023 · There are write-ups about reconfiguring 1992-1995 fullsize truck DRAC modules to recalibrate the speedometer, including replacing the hardwired jumpers with DIP switches. 3 Edelbrock equipped2003 Chevrolet S10 4. Installing a VSS on an older model S-10 Blazer is possible but requires that you find or modify the appropriate DRAC (Digital Ratio Adapter Controller) to match your final drive ratio. 31999 Chevrolet S10 Xtreme 2. You can use a 14 pin VSSB as a replacement for a DRAC but not the other way around. 8mom5, s78n3, kvmp, 4cdl, exjsuj, kufxor, n84fqb, wkhr0, j0ubt, vsfly,