Will gear ratio affect odometer reading?
Jan 23, 2010 | 10:24 PM
#1
Will gear ratio affect odometer reading?
If you have a truck that came from the factory with 3.42 gears and changed the gears to 4.10, but did not have the odometer or computer calibrated for the change, will the odometer be correct? For example: Changed gears from 3.42's to 4.10's at 20,000 miles. Tire size is 275/55/20. Odometer reading now is 50,000 miles. If the truck was never calibrated, will the odometer be correct?
Jan 23, 2010 | 10:40 PM
#3
Its not my truck. I'm looking at buying the truck, haven't seen it in person, but the salesman claims the truck actually has less miles because it was never calibrated after the gear change.
Jan 23, 2010 | 10:44 PM
#4
How is that possible? The odometer being correct is dependent on the speedo being correct. Unless the odometer is running off of radar and I'm pretty sure that it isn't. The salesman could be right, but honestly the odometers in these trucks is a joke they are easy to cheat if someone want's to bad enough.
Jan 23, 2010 | 10:48 PM
#5
exactly if your speedometer is off it will calculate mileage that way and it will be way off. my camaro came with 18k on it and had aftermarket 4.10 gears in it . when i drove it the speedo was quite a bit off and was reading high . the car didnt really have 18k miles more like 15k miles . i corrected it with hpt and now all is good.
Jan 23, 2010 | 10:52 PM
#7
Sorry bud, but that is FALSE! Odometer is revolution per mile calculated, therefore if you don't correct the PCM so it know there has been a gear change, the odometer will NOT be correct.
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Jan 23, 2010 | 10:55 PM
#8
If it's only reading 50,000 I wouldn't worry to much about the mileage. That's pretty low for these engines anyway, it is probably only 10,000 less at the most anyway. Legally however it has on it what the odometer says it does so the salesman can't really expect to get more money out of it based on a claim that it has less even if it really does.
