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Username Post: reconfiguring DRAC module        (Topic#171188)
Senior Member
Posts: 189
Loc: Phoenix, AZ.
Reg: 06-05-04
10-01-07 01:39 PM - Post#1265396    

A topic came up in another post (someotherguy I believe) that touched on reconfiguring the DRAC module to help counter effects of oversize tires (305/75-16). Does anyone have more information on how this may work? And where is the DRAC?(95 K1500)

JT Wright in AZ
99 Tahoe (89K)
95 K1500 (150K)

Posts: 28656
Age: 48
Loc: Texas
Reg: 08-01-03
10-01-07 03:08 PM - Post#1265467    
    In response to TwoTimer

Hey JT,

On the previous interior style, it's right inside the dashboard, accessible by removing the glovebox interior. On your '95 you should be able to just gently (gently!) squeeze in the top corners of your glovebox while it's open, and continue opening it and it should release from the dash. Hopefully the DRAC will be in a similar location as the '94-down. It's encased in a white plastic box about 3" square with a harness plugged into it, and may be either velcro'd or held into the lower dash wiring conduit wtih some plastic "rivets."

Now here's where we get into the less-definite stuff. I did not write the following guide and take zero credit for it; I found it on fullsizechevy years ago and the most important part, the DRAC configuration table, was missing! The link was dead. I scoured the net for it several times until I finally found it, put everything together and hosted it on my web space.

Hang on a few minutes and let me straighten the link out and I'll edit this post with it. The information is for upgrading an 88-91 that has the "moonie" gauges and old style speedo electronics to use the 92-94 style cluster; I suspect that even though your '95 uses the new interior & dash cluster, since it's still OBD-1 it may use the same DRAC module. It would be my bet (though I haven't had to look) that the OBD-2 '96-up has a totally different setup. At any rate now that it's clear as mud, you can skip all the stuff in the guide about cutting wiring harnesses, adding the DRAC, etc. and just look at the part about changing the DRAC to being user-configurable.

Edit - here we go;

Again, since you're not an 88-91, all you need to do is modify the DRAC with the switches, and set them according to the DRAC2.pdf file (you'll need Adobe Acrobat reader on your computer to see the file.) Ignore all the stuff about the wiring changes, buying the speedo cluster, etc. and ignore where the picture shows the DRAC module behind the radio; that's just where this guy put his when he added it to his 88-91 truck.

I've seen some reports in the past that they thought the info in the table was backwards, so use at your own risk. Best thing to do is take a picture or write down the original jumper settings on your DRAC so you can easily set the switches to that if you have any trouble getting it changed. I'll be changing two of mine in the very near future (and verifying them with my GPS) so I'll be able to help more on this subject very soon.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

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