- Joined
- August 3, 2000
- Messages
- 34,942
- Reaction score
- 11,885
- City, State
- NORTH IDAHO, 7B
- Year, Model & Trim Level
- B2 "Slightly" Modified
- Callsign
- FOURTEN
You are correct sir, I had to do some research:
Hahahaha for many years I was under the impression it was for light duty (maybe it should have been) Not sure where I picked that up???
A4LD
The accronym A4LD stands for "Automatic 4th gear Lockup Device". The A4LD automatic overdrive transmission is a Ford C3 automatic transmission modified with the addition of overdrive. It's developed a bad reputation as being weak and unreliable. It can be a good unit if properly maintained and beefed up for the given application. However just like any other mechanical device it has it's limitations. The first version of this transmission has a single electronic control solenoid located in the valve body that moves a valve allowing transmission fluid to flow into the TCC (torque converter clutch) circuit of the transmission. When fluid flows through this circuit it causes the engagement of the TCC. This process is known as "converter lockup". The timing of this lockup is controlled by the ECA (Electronic Control Assembly). The purpose of the clutch is to create a direct positive connection between the engine and transmission. This reduces slippage, thereby limiting the workload on the engine. Which improves power transmission to the driveline, and fuel economy. Normally the clutch should only engage at a steady highway speed (aprx. 45+ MPH) with the transmission shifted into overdrive. The later models incorporated electronically controlled overdrive as well. This was achieved with the addition of one or more control solenoids for this process.
Ford only offered the first version of this transmission for 2.8L powered Rangers and Bronco II's in 1984, and 1985. In 1986 the OD position on the shift selector was removed, and replaced with an electronic OD shift button. Vehicles equipped with the early version of this transmission require additional steps to complete our Ignition and Fuel Delivery System Conversion. We don't recommend that vehicles equipped with the later version (electronic overdrive) do this conversion. The more complicated nature of the later version has elluded us from a solution for controlling it without the computer.
Hahahaha for many years I was under the impression it was for light duty (maybe it should have been) Not sure where I picked that up???
A4LD
The accronym A4LD stands for "Automatic 4th gear Lockup Device". The A4LD automatic overdrive transmission is a Ford C3 automatic transmission modified with the addition of overdrive. It's developed a bad reputation as being weak and unreliable. It can be a good unit if properly maintained and beefed up for the given application. However just like any other mechanical device it has it's limitations. The first version of this transmission has a single electronic control solenoid located in the valve body that moves a valve allowing transmission fluid to flow into the TCC (torque converter clutch) circuit of the transmission. When fluid flows through this circuit it causes the engagement of the TCC. This process is known as "converter lockup". The timing of this lockup is controlled by the ECA (Electronic Control Assembly). The purpose of the clutch is to create a direct positive connection between the engine and transmission. This reduces slippage, thereby limiting the workload on the engine. Which improves power transmission to the driveline, and fuel economy. Normally the clutch should only engage at a steady highway speed (aprx. 45+ MPH) with the transmission shifted into overdrive. The later models incorporated electronically controlled overdrive as well. This was achieved with the addition of one or more control solenoids for this process.
Ford only offered the first version of this transmission for 2.8L powered Rangers and Bronco II's in 1984, and 1985. In 1986 the OD position on the shift selector was removed, and replaced with an electronic OD shift button. Vehicles equipped with the early version of this transmission require additional steps to complete our Ignition and Fuel Delivery System Conversion. We don't recommend that vehicles equipped with the later version (electronic overdrive) do this conversion. The more complicated nature of the later version has elluded us from a solution for controlling it without the computer.
