Considering a GEAR change.... Need real world advice
01-25-2018, 07:57 PM
#11
Senior Member
Originally Posted by FXtreme5.0
My Tires are OE size still, 275/55/R20 & she's an FX2
Crazy the Tremor has a 4.10 Ratio, assuming that's all for "seat of the pants" feel
Crazy the Tremor has a 4.10 Ratio, assuming that's all for "seat of the pants" feel
I went from 3.55 to 4.11 Yukons and say that should be the minimum anyone goes to, just to make it worth the time and money and maybe even add a little to a future buyers.
Last edited by SteveLord; 01-25-2018 at 08:02 PM.
01-25-2018, 08:32 PM
#12
Senior Member
I changed from 3.55 to 4.10 with 33" tire and it was a big improvement. Fuel mileage didn't change enough to matter. I now have 35" tires and kinda wish I had gone 4.56. But I would definitely use Ford gears. They are about the same price and will be a lot quieter than aftermarket.
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FXtreme5.0 (01-26-2018)
01-26-2018, 12:26 AM
#14
How's she goin' eh?
I have 3.73's, 33" tires and a 5.0. I'm happy. When I ran the 275's I got good mileage highway driving.
01-26-2018, 02:11 AM
#16
Senior Member
I've read the same thing, and also find it weird. But the data in the 1/4 mile time agrees. For the EB, the higher geared trucks are typically a little faster than the lower geared trucks. IDK, maybe has something to do with the turbos or torque curve.
3.31 to 4.10 is a 24% change, which would be about 500 rpm increase at 2000rpm. At 1500rpm it would be 350rpm increase.
3.31 to 4.10 is a 24% change, which would be about 500 rpm increase at 2000rpm. At 1500rpm it would be 350rpm increase.
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FXtreme5.0 (01-26-2018)
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01-26-2018, 08:08 AM
#18
How's she goin' eh?
Sure, I have mentioned it before. When I got my truck we took it across Michigan. East to west, so slightly uphill and back. I got 12L/100 kms, it translates to 22-23mpg. I was empty cargo wise, my wife and I and not towing.
City was around 15-17mpg. Now with the larger tire and winter gas city I'm around 13-14mpg. I haven't had the chance to do highway with the new setup.
I'm still at around 2k rpm if I'm doing 65-70mph.
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01-26-2018, 09:08 AM
#19
Senior Member
I'd do 4.10's/4.11's for 2 reasons. The 5.0 loves to rev, and these trucks are heavy. The torque multiplier of 4.10's will substantially help the seat of the pants feel, and get the truck moving and accelerating much better. Added bonus would be the easier towing, if you run into a situation where you have to tow something decently heavy. These overdrive 6 speeds and tall tires (compared to a car tire) give us the room to go over 3.73's easily. Below is a rough guideline of RPM's for each gear, for each tire size, assuming 6th gear cruising.
70 MPH with 32's and 3.31's = 1679 RPM
70 MPH with 33's and 3.31's = 1628 RPM
70 MPH with 34's and 3.31's = 1580 RPM
70 MPH with 35's and 3.31's = 1535 RPM
70 MPH with 32's and 3.55's = 1800 RPM
70 MPH with 33's and 3.55's = 1746 RPM
70 MPH with 34's and 3.55's = 1694 RPM
70 MPH with 35's and 3.55's = 1646 RPM
70 MPH with 32's and 3.73's = 1892 RPM
70 MPH with 33's and 3.73's = 1834 RPM
70 MPH with 34's and 3.73's = 1780 RPM
70 MPH with 35's and 3.73's = 1730 RPM
70 MPH with 32's and 4.11's = 2084 RPM
70 MPH with 33's and 4.11's = 2021 RPM
70 MPH with 34's and 4.11's = 1962 RPM
70 MPH with 35's and 4.11's = 1906 RPM
70 MPH with 32's and 4.56's = 2313 RPM
70 MPH with 33's and 4.56's = 2243 RPM
70 MPH with 34's and 4.56's = 2177 RPM
70 MPH with 35's and 4.56's = 2114 RPM
70 MPH with 32's and 3.31's = 1679 RPM
70 MPH with 33's and 3.31's = 1628 RPM
70 MPH with 34's and 3.31's = 1580 RPM
70 MPH with 35's and 3.31's = 1535 RPM
70 MPH with 32's and 3.55's = 1800 RPM
70 MPH with 33's and 3.55's = 1746 RPM
70 MPH with 34's and 3.55's = 1694 RPM
70 MPH with 35's and 3.55's = 1646 RPM
70 MPH with 32's and 3.73's = 1892 RPM
70 MPH with 33's and 3.73's = 1834 RPM
70 MPH with 34's and 3.73's = 1780 RPM
70 MPH with 35's and 3.73's = 1730 RPM
70 MPH with 32's and 4.11's = 2084 RPM
70 MPH with 33's and 4.11's = 2021 RPM
70 MPH with 34's and 4.11's = 1962 RPM
70 MPH with 35's and 4.11's = 1906 RPM
70 MPH with 32's and 4.56's = 2313 RPM
70 MPH with 33's and 4.56's = 2243 RPM
70 MPH with 34's and 4.56's = 2177 RPM
70 MPH with 35's and 4.56's = 2114 RPM
Last edited by RedsRock302; 01-26-2018 at 11:05 AM.
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FXtreme5.0 (01-26-2018)
01-26-2018, 10:42 AM
#20
How's she goin' eh?
Why no comparison of the 3.73's? He asked about that ratio.