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Old 07-06-2005, 09:37 PM
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calibrating the speedo- 93 gmc pick-up 2wd

I scored a 10 bolt posi 3:73 for my truck so it will pull a trailer better. Had 3:42? or something. It's an od tranny. Of course my speedo will be out. I've been getting some conflicting info. The parts guy at the dealer (who didn't sound to confident) said $170 for a kit that installs in the tailshaft. I also found some aftermarket electronic gismo that installs in the wiring harness but it's close to $200. The wrecker thought I had to pull out my speedo cluster and there should be a small plug with seven or eight pins on it inserted in the back and different ratios had different pins cut off so there is a total of 3? pins in various combinations for the various ratios. He wasn't positive the 93 had this but found a 92 cluster on the shelf with the little plug. Anyone have any experience with this?

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Old 07-07-2005, 10:02 AM
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I do not know about the 93 but my 90 had the the little centipede looking chip ( like the 92 )

The factory manual told which legs up and which legs down for each gear ratio.......

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Old 07-07-2005, 04:52 PM
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Thanks Deuce. Looks like I have to go back to the dealer to check this out further.
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Old 07-08-2005, 02:53 PM
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The '93 has an all electronic controlled transmission. No speedo cable. If I remember correctly the computer will recalibrate itself after a period of driving. To run a different tranny other than the electronically controlled trans...then you need what I believe that you are talking about, for example putting a 700R4 into the '93, because th e700R4 is not electronically shifted. DocVette probably has a better answer for this though. Also check THIS SITE as these guys are truck gearheads.

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Old 07-08-2005, 03:33 PM
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Kevin45, I have the original tranny, but have changed the gear ratio. The speedo is electronic. I once disconnected the wire at the tail piece and the tranny wouldn't shift out of first gear. Anyway, I went to another GM dealer today and was told I need a new, custom calibrated D.R.A.C module. I believe it's located behind the cluster somewhere. I was given a form to fill out with gear ratio and tire circumference, etc. and they will send out a module. It costs $175cdn. There's probably many available at the wreckers but finding the RIGHT one could prove difficult.
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Old 07-08-2005, 05:41 PM
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Man, I am learning all kinds of different things about a '93 Chevy truck. One is to not believe anyone in my area as to what they say. LOL!!! And another is to never own a '93. LOL!! Anyways while doing a search I ran across this which may save you some bucks. CHECK IT Or hopefully it can.

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