Re-gearing
Junior User
Joined: Jul 2009
Posts: 92
Likes: 0
From: Cartersville, GA
Higher ratio better for towing, lower supposedly better on the highway.
I went from 3.73 to 4.30 in my V10 Excursion running 315's and picked up 1-2mpg in town, 2-3 towing my boat and highway mileage stayed around the same.
I went from 5-6 to 7-8 towing, 8-10 to around 10 average and get about 12-13 on the road.
I went from 3.73 to 4.30 in my V10 Excursion running 315's and picked up 1-2mpg in town, 2-3 towing my boat and highway mileage stayed around the same.
I went from 5-6 to 7-8 towing, 8-10 to around 10 average and get about 12-13 on the road.
Senior User
Joined: Apr 2006
Posts: 247
Likes: 0
From: Rigby, ID
The Excursion is uses almost exclusively for towing and bad weather driving so I don't mind the higher RPMS when I am just using it for a run to town or something. Overall I'm hoping that the lower gears help my MPG too because the truck won't be working as hard to turn those oversized tires!
Fleet Mechanic
Joined: Feb 2012
Posts: 1,545
Likes: 3
From: N.E. of WinterPeg
Are you guys that are running these gynormous tires doing anything to correct the speedo?...if not...the mpg's you are calculating will be way off regardless because the miles traveled per tank will be off due to the inaccurate speedo...a vicious cycle.
Now a re-gear does NOT affect the speedo because of where the speedo pick up sensor is located...but you would need a tuner to reprogram the PCM for tire size change...
Just thinking as I type.
Joe
Now a re-gear does NOT affect the speedo because of where the speedo pick up sensor is located...but you would need a tuner to reprogram the PCM for tire size change...
Just thinking as I type.
Joe
TRU-SPEED SENSOR CALIBRATOR, MOD. A
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
The Excursion is uses almost exclusively for towing and bad weather driving so I don't mind the higher RPMS when I am just using it for a run to town or something. Overall I'm hoping that the lower gears help my MPG too because the truck won't be working as hard to turn those oversized tires!
Junior User
Joined: Jul 2009
Posts: 92
Likes: 0
From: Cartersville, GA
My speedo is about 8% percent off so I just use my Scangauge II to correct my speedo as well as track my MPG, trans temp, etc. Works great and you can calibrate the unit for your setup. I used GPS to calibrate my MPH and seems to work very well.
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Posting Guru
Joined: Dec 2011
Posts: 1,016
Likes: 0
Does this thing work at all?? I'm 4:88 with 42's and I'm 24 off. Confirmed on profesional speedo tester. Sorry if this is off topic
TRU-SPEED SENSOR CALIBRATOR, MOD. A
TRU-SPEED SENSOR CALIBRATOR, MOD. A
Should get a chance to test it next week. Maybe even this weekend.
Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,414
From: Oologah, OK
I just looked up where you are....
just a few minutes from my son in Dawsonville, GA
Smothers Supercars in Oologah, OK did my Excursion rear diff,
did it right, and a fair price.
http://www.smotherssupercars.com/
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traildogg
1999 - 2016 Super Duty
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