P0734 on Ford Vehicles: Gear 4 Incorrect Ratio
Fourth gear (overdrive on four-speed units) doesn't hold the expected input-to-output speed ratio. P0734 →
5Complaints mentioning the code
#1Rank among 4 brands
0.2%Share of Ford DTC complaints
In NHTSA owner complaints we analyzed for Ford, P0734 was mentioned 5 times.
Notes by brand
In the 4R70W and 4R75 used in the F-150, Crown Victoria, Grand Marquis and Mustang, 4th gear relies on the overdrive band and servo. Worn band lining and leaking servo seals are common reasons for overdrive slip and a 3-4 flare on these units.
Most mentioned models
| Ford Escape | 1 | |
|---|---|---|
| Ford Escape Hybrid | 1 | |
| Ford F-150 CREW CAB | 1 | |
| Ford F-150 REGULAR CAB | 1 | |
| Ford Focus Bev | 1 |
Model years mentioned
Components named in these complaints
- Power Train (3)
- Electrical System (1)
- Unknown Or Other (1)
Often appears together with
P0731
Powertrain
While in first gear, the transmission's input and output speeds don't match the first-gear…
Moderate
P0732
Powertrain
Second gear isn't holding: the input-to-output speed ratio in 2nd is outside the expected range.
Moderate
P0733
Powertrain
Third gear slips: input shaft speed doesn't match output speed times the 3rd-gear ratio.
Moderate
P0735
Powertrain
Fifth gear slips or isn't fully applied; the TCM measures a ratio that doesn't fit 5th.
Moderate
Possible causes
- Worn overdrive band, 2-4 band or 2-4 clutch that holds 4th
- Worn 3-4, direct or overdrive clutch pack shared with 3rd
- Low fluid, or overfilled fluid foaming at highway speed
- Leaking servo piston seal or cover on the band that holds 4th
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.