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Something isn't right


ADub

New Member
Joined
Jan 31, 2008
Messages
3
Transmission
Automatic
Just picked up an 03 Edge reg cab 3.0 V6 5spd. Has an 8.8 with 4.10s and stock 235/75 15s. At 60mph, the tach reads 2500 rpm. I thought the 5th gear in these trucks was .79? Are the factory gauges this far off?
 
no,you said it yourself. 4.10's and 235/75's are low geared.be glad you have a 3.0 its happy at 3,000 and will get better mileage with the low gears
 
Not complaining about the gearing, but if you do the math, I should be doing 66.4 mph at 2500 rpm, not 60.
 
Are you sure that those tires are the original size? If not, are you sure the dealer adjusted the speedometer correctly? Either thing could contribute to what you are seeing.
 
Checked the door sticker, original size. They are OEM tires all around, (2) are still original.
 
Checked the door sticker, original size. They are OEM tires all around, (2) are still original.
i'll be frank, i don't know what your gearing in your transmission is supposed to be, a simple test you can perform is to take it on the highway and do an odometer test. maintain a steady speed and when you pass a milepost note your odometer reading, for example if your odometer reads 12345 when you pass the milepost and rolls over to 12346 at the next milepost then your speedometer is correct. then you can assume your RPM issue is related to low gears and tire size. low gears and bigger tires = higher rpm's
 

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