DRAC or VSSB? And where?

[jonathon]

Will my 1991 V2500 Suburban with a 4L80E in it have DRAC or VSSB? Where is it? I looked around the ECM and couldn't find anything.. trying to find it so I can recalibrate it once I get my new tires.

 

[Russell]

Yep, take a peek just behind the dash near your ash tray, they sometimes got put in back there.

 

[dhcomp]

I forget which its called, but there is a thread around here somewhere for that year. I have a 91 too. You need to remove some connectors with a LOW heat soldering iron, and replace with a 7 pin DIP switch. You can make an 8 pin fit and skip the last dip, but i bought like 6 7 pin's off ebay for nothing.

If you want, i can put one in an envelope to you for practically nothing. I don't need as many as i had to buy.

Here we go
http://coloradok5.com/forums/showthread.php?t=103495

 

[jonathon]

Where was your module hidden?

 

[dhcomp]

I haven't upped my tires size yet, so haven't looked. I remember seeing something just below the radio though, that looked just like that. Can't be much help there though.

 

[jonathon]

I haven't upped my tires size yet, so haven't looked. I remember seeing something just below the radio though, that looked just like that. Can't be much help there though.

That's cool, gives me a place to look

 

[dhcomp]

What is the thing with large aluminum heat sink clipped to the bottom of the column? Doubt it, but thats another appropriately sized black box.....

 

[73k5blazer]

What is the thing with large aluminum heat sink clipped to the bottom of the column? Doubt it, but thats another appropriately sized black box.....

That's the wiper module.

I always thought the VSS or drac was the little green box behind the gauges connected by a little ribbon cable to the back of the speedo. Usally on the top of the steering column.

 

[Russell]

That one is indeed the VSS, but isn't the DRAC. The DRAC was introduced when the speedometer cable was eliminated and a pulse sensor was installed in the tailhousing of the tranfercase or the transmission in 2wd applications.

 

[BGKYK5]

The DRAC was just under the dash about where your right knee is when you are sitting in the driver's seat. It is a white box a little bigger than a pack of playing cards.

Look down at the bottom of this page for info on what I did with my DRAC.