Gear ratio
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5th Wheeling
Joined: Aug 2001
Posts: 31
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From: Page AZ
Gear ratio
I have a '73 Bronco with a C4 trans. The differential gear ratio appears to be 1.75:1. Is this a normal ratio for an automatic? I haven't pulled a cover off the front yet, just using the wheel turn to drive shaft turns method to try to determine the ratio.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,271
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From: S/W Missouri, Polk county
2.46:1, In 1973, Ford finally answered the calls for modernization by introducing the C-4 automatic transmission option and optional power steering.
The C-4 had ratios of 2.46:1 low, 1.46 second, and 1:1 third.
Gear Ratios - Early Bronco Registry C4 3-speed 2.46, 1.46, 1.00DIFFERENTIALS:
Early Bronco 6 cyl 8 cyl
Standard 4.11 3.50 (These are rear axle ratios. Front axles ratios are 4.10 and 3.54.)
Factory Option 4.56 4.11
https://bcbroncos.com/a-little-bronco-history/
The C-4 had ratios of 2.46:1 low, 1.46 second, and 1:1 third.
Gear Ratios - Early Bronco Registry C4 3-speed 2.46, 1.46, 1.00DIFFERENTIALS:
Early Bronco 6 cyl 8 cyl
Standard 4.11 3.50 (These are rear axle ratios. Front axles ratios are 4.10 and 3.54.)
Factory Option 4.56 4.11
https://bcbroncos.com/a-little-bronco-history/
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
2.46:1, In 1973, Ford finally answered the calls for modernization by introducing the C-4 automatic transmission option and optional power steering.
The C-4 had ratios of 2.46:1 low, 1.46 second, and 1:1 third.
Gear Ratios - Early Bronco Registry C4 3-speed 2.46, 1.46, 1.00DIFFERENTIALS:
Early Bronco 6 cyl 8 cyl
Standard 4.11 3.50 (These are rear axle ratios. Front axles ratios are 4.10 and 3.54.)
Factory Option 4.56 4.11
https://bcbroncos.com/a-little-bronco-history/
The C-4 had ratios of 2.46:1 low, 1.46 second, and 1:1 third.
Gear Ratios - Early Bronco Registry C4 3-speed 2.46, 1.46, 1.00DIFFERENTIALS:
Early Bronco 6 cyl 8 cyl
Standard 4.11 3.50 (These are rear axle ratios. Front axles ratios are 4.10 and 3.54.)
Factory Option 4.56 4.11
https://bcbroncos.com/a-little-bronco-history/
But it should be what he finished up with. 3.50 and 4.11 (rear, 3.54 and 4.10 front) are the most common. I didn't know 4.56 was an option, but it wouldn't shock me if it was.
How did you get the 1.75? That's exactly half of 3.50, so I'm guessing you've got 3.50/3.54 axles and a divide-by-2 error in your figuring.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,271
Likes: 5,822
From: S/W Missouri, Polk county
Well when not knowing the correct answer on something, I try to find it. The 1st part of my replay was a copy and past and I believe is if for the C-4 transmission. I figured good info to know, so I left it.
Then I found what I believe to be the answer he was looking for.
Then I found what I believe to be the answer he was looking for.
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