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Old 08-04-2006, 03:14 PM
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What's this?

OK, I changed the rear end to a posi with 3.42 gears in my 91 camaro rs 305. The speedo is off now and I wan't to recalibrate it. I was just under the car changing the fuel pump and didn't see any cables going into the rear diff area. I'm assuming it's electronic with vss and drac. Where is the drac unit? Under the dash beside the ECM is a black box with a circuit board style card that slides out. I checked it and it looks nothing like the DRAC units i've seen on this site??

Any suggestions?
Old 08-04-2006, 05:23 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Can't you just change the speedo gear in the trans?

I guess you have an electronic speedometer, rather than a cable drive, but there's still a physical gear in the trans which is then transmitted via electrical signal, rather then moving cable, to the speedometer in your dash. None the less, still a gear in the trans right?
Old 08-04-2006, 05:43 PM
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Not sure, never taken the tranny apart. I get all my info here.
Old 08-04-2006, 07:18 PM
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
https://www.thirdgen.org/speedogear
Old 08-04-2006, 10:16 PM
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Originally Posted by gt500pwr
Not sure, never taken the tranny apart. I get all my info here.
Then you should be familiar with our search function, no?




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