The E4OD and the 4R100 are both Ford heavy-duty four-speed automatics with overdrive, used in F-250 and F-350 trucks and in Ford vans. The 4R100 succeeded the E4OD in the late 1990s and is generally described as a revised, strengthened version of it. Both share the same gear ratios, so the main question for a replacement is which unit your truck was built with.
E4OD vs 4R100 at a glance
| E4OD | 4R100 | |
|---|---|---|
| Type | Four-speed automatic with overdrive | Four-speed automatic with overdrive |
| Control | Electronic | Electronic |
| Typical vehicles | Heavy-duty F-Series trucks and E-Series vans | F-250/F-350 Super Duty trucks and E-Series vans |
| Timeline | Earlier unit, replaced in the late 1990s | Successor from the late 1990s |
| Gear ratios (1st / 2nd / 3rd / 4th) | 2.71 / 1.54 / 1.00 / 0.71 | 2.71 / 1.54 / 1.00 / 0.71 |
| Position in the family | Original design | Revised, strengthened successor |
The changeover happened at different points for different models, so treat any year range as approximate and confirm your unit by VIN or by the transmission’s identification tag.
What do the names mean?
E4OD stands for Electronic 4-speed OverDrive. The 4R100 uses Ford’s later naming style: 4 forward speeds, R for rear-wheel drive, and a number that indicates relative torque capacity. The name changed along with the revisions, but the basic layout, four forward gears with an overdrive top gear, stayed the same.
Do the E4OD and 4R100 have the same gear ratios?
Yes. Both are commonly listed at 2.71 in first, 1.54 in second, 1.00 in third and 0.71 in overdrive. The overall gearing of the truck is therefore set mainly by axle ratio and tire size rather than by which of the two transmissions is fitted. Our transmission gear ratio chart lists these alongside other common units.
How is the 4R100 different from the E4OD?
The 4R100 is generally described as a revised and strengthened version of the E4OD, introduced as Ford’s heavy-duty trucks moved into the Super Duty era. The detailed internal and electronic changes varied with model year, and we do not list them part by part here. When ordering, the important thing is that the replacement matches the code, model year and drivetrain (two-wheel or four-wheel drive) of your vehicle, and that you do not assume one unit is a plug-and-play swap for the other.
Which trucks used them?
Both units were used in Ford’s heavier trucks and vans, behind the large gasoline engines and the 7.3L diesel. If you have a late-1990s or early-2000s F-250 or F-350 Super Duty with an automatic, it most likely has a 4R100. Earlier heavy-duty F-Series trucks with an electronically controlled four-speed automatic most likely have an E4OD. Vans and trucks near the changeover are the ones most worth checking carefully.
How do I confirm which one I have?
- Check the transmission code on the vehicle’s certification label and decode it for your model year.
- Read the identification tag on the transmission case.
- Give us the VIN if you are unsure, especially for a truck that may have had its transmission replaced before.
Where to find each one
Every listing names its transmission code and comes with a torque converter. Browse E4OD transmissions and 4R100 transmissions, or see everything that fits Ford trucks under Ford transmissions.
More guides: solenoid pack · E4OD problems · 4R100 problems · E4OD vs 4R70W · how long a 4R100 lasts.
Shipping is a flat $80.00 per order to US addresses, with 15-day free returns. Questions? Ask a parts specialist.