Gears
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Freshman User
Joined: May 2001
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Gears
What would be a good gearing choice for a 1966 ford f-100. I want ALOT of torque but I want some speed also. It is a daily driver. I was thinking around 3:83? or something along those lines any suggestions?
Thanks
Thanks
Mountain Pass
Joined: Dec 2000
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From: eudora ks
Gears
my 66 sb 428 c6 with 3.50 trac-loc i find to be a little low. i am not comfortable running at 3000rpm constantly to keep up with the traffic on the highway. i like the stoplite gig but i think i would be more comfortable with 3.25 or 3.00 instead of the 3.50's for highway driving. tires are quite tall also. i would guess my gas mileage to be 5-8 depending on how hard i hit the holley. just my take. jim.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Gears
David, In 66 the 352 and auto came with 3.00 gears. Plenty of power with some mpg. You might have to have a tire store card to run a gear like that you were thinking about, they wouldn't last long.
John
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John
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Senior User
Joined: Mar 2000
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Gears
i run 4.10 in my 65 with a 352/c6, it runs about 3000 at 70 mph, take off is great, and it still has enough top end to keep ,up with just about anything. i also run 33" tall tires. depending on your tire size i would say a 3.73 would be a good all around gear.
mattb
mattb
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From: Creedmoor, North Carolina
Gears
Matt, your speedo is way off man. That 352 will be turning a lot higher at 70 mph than 3000 rpms with a 4.10 gear. Mines turning 24-2500 with a 2.75.
John
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66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
John
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66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
Senior User
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Gears
John, that 3000rpm at 70mph was passing one of those police radar traps they use up here in WI. they just tell you how fast you are going, i was doing 70mph past one at 3000rpm. remember i have 33" tall tires.
matt
matt
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Joined: Apr 2000
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From: Ozarks
Gears
John, I think he is about right. I have 32.5" tall tires, with 4.88 gears, and turn 3025 rpm at 60 mph. Calculated and confirmed with my new electronic S-W tach.
If you run the math (1 revolution is 3.14 times the tire height, 60 mph is 5280 feet in 1 minute, etc) you should find that 33" = 8.64 feet per revolution, 70 mph = 6160 feet per minute, thus 6160/8.64 = 713 wheel rpm times 4.10 gears = 2923 driveshaft rpm with a 1:1 high gear, plus a little for converter slippage.
If you run the math (1 revolution is 3.14 times the tire height, 60 mph is 5280 feet in 1 minute, etc) you should find that 33" = 8.64 feet per revolution, 70 mph = 6160 feet per minute, thus 6160/8.64 = 713 wheel rpm times 4.10 gears = 2923 driveshaft rpm with a 1:1 high gear, plus a little for converter slippage.
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Gears
I ran mine up to 3000 rpm on my trip and it was showing 82.
John
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[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.
John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group
66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.
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Brett Foote
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Joined: Feb 2001
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Gears
I have a 262-6, and the Spicer 60 (Dana), has 4.10 ratio. I have no idea what rpm I would pull at 70 mph, but I rarely drive it that fast. Too loud. but the power is awesome. It really handles and drives so much better with a few hundred lbs in bed. I have had 1800 lbs of soil in the bed.
It gets pretty bad milage for a 6 cyl, with one barrel carb. Probably about 8 mph over including town.
Is that about right?
It gets pretty bad milage for a 6 cyl, with one barrel carb. Probably about 8 mph over including town.
Is that about right?
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