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Old 02-17-2011, 07:34 AM   #1 (permalink)
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Default Geo Tracker axle swap

I have a '97 Geo Tracker 2 wd with 5 spd manual transmission. Rear axle ratio is 5.12:1. I just exchanged rear axles and installed one with a 4.3:1 ratio. The speedometer now reads approximately 10 mph slow. What's available to correct it?
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Old 02-17-2011, 07:56 AM   #2 (permalink)
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Howie,


I just stick my GPS on the window and it gives perfect MPH.

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Old 02-17-2011, 08:15 AM   #3 (permalink)
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I think the speedometer gear is in the transfer case, but I don't know if it's as simple as changing it out with one from a 4.30:1 vehicle.

Glancing at the FSM, it looks like the speedometer drive gear is removable from the rear output shaft. I don't know which is necessary, the speedometer driven gear on the end of the speedometer cable or the speedometer drive gear on the main shaft. Sorry.

What kind of performance/driveability are you noticing with the lower gears? Do you like it?
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Old 02-17-2011, 09:51 AM   #4 (permalink)
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Doh!, just realized you have a 2wd.

Looks to be the same deal only on the mainshaft of the transmission near the output end.

Last edited by BOZO; 02-17-2011 at 10:15 AM.
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Old 02-17-2011, 05:00 PM   #5 (permalink)
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Default Tracker axle swap from 5.125 to 4.30 ratio.

Thanks, Guys:
I have been using my GPS and it works well. 45mph=55, 50=60; 55=67; 60=72. I can now cruise on the highway at 3000 rpm and be traveling at 68 mph. As for fuel economy, the first tank went from 30mpg to 36 mpg. Performance is good.
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Old 02-17-2011, 05:45 PM   #6 (permalink)
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Good news, I like it. Now, with an Ecotec might be a bit higher too.
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Old 02-17-2011, 06:44 PM   #7 (permalink)
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Good to hear. How'd you calculate your fuel mileage when the speedo/odometer are off? Can you accumulate mileage on your GPS?

If you didn't compensate for this, then couldn't your MPG be even higher?

Just wondering.
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Old 02-17-2011, 08:40 PM   #8 (permalink)
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I think is done by distance travel via Map and time of travel.

Used a Magellan before and I must say that was pretty accurate compared to my car speedometer.
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Old 02-18-2011, 05:05 PM   #9 (permalink)
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Default Tracker axle swap from 5.125 to 4.30 ratio.

The Magellan GPS allows you to accumulate trip mileage as well as use it for a speedometer. It seems to be very accurate. First report was on 1/2 tank of gas. Going to run the entire tank out this time before calculating mileage. One hundred miles on the odometer translates to 121 on the GPS.
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Old 02-18-2011, 05:15 PM   #10 (permalink)
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I think the Speed is calculated on segments by a sample distance between Point A and Point B divided by an internal clock time (lets say, .001 Sec to .005) and repeats all over again. I believe the GPS system has an Universal Clock that syncs all Satellites and GPS Receivers.

The distance travel is different since is based on a road map Vs an actual road reading (both could not be accurate adding a larger degree of inaccuracy) from Point A origination and Point B final destination.

Well, that is my take on it
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1994 Geo Tracker, 8V, TPI, Manual, 4X4, 2DR, Soft Top

Other Toys...
2009 Pontiac G8 GT 6.0L
2007 VWL Beetle 5 Cly
2003 Chevrolet Impala 3.4L
2001 Pontiac Grand Am SE 3.4L

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Last edited by Richard Craneum; 02-18-2011 at 05:17 PM.
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