Yo; to begin with, here is the Ford TSB;
TSB 89-09-18 Introduction to the E4OD
ISSUE: The E4OD is a new 4-speed automatic overdrive transmission. The E4OD transmission was derived from the C-6 automatic (3-speed) transmission.
ACTION: Use the following information to familiarize yourself with the various E4OD components. This information can help you explain the operation of the transmission to the customer.
The E4OD uses electronics to control shift points, pressure regulation and torque converter clutch control. This provides high quality shifts, good fuel economy and overall performance. The engine and transmission are monitored with diagnostic testing available through the EEC-IV Quick Test. The E4OD operations are provided by both operator selected positions of the manual selector lever and with an overdrive cancel switch located on the instrument panel.
P (Park), R (Reverse), and N (Neutral) are the same as other Ford automatic transmissions.
D (Overdrive - normal driving position) provides all automatic shifts through fourth gear (overdrive) along with application and release of the converter clutch. The transmission may also be shifted manually between all forward ranges.
D (Overdrive - with overdrive cancel switch activated, amber light on. This position is selected by pushing the button on the instrument panel, or shift stalk on later models
.) provides all automatic shifts, including the application and release of the converter clutch, except the shift into overdrive. It is used to provide additional engine braking for descending grades.
2 (Manual second) provides only second gear operation regardless of vehicle speed. It is useful for start-up on slippery surfaces or to provide engine braking on downgrades.
1 (Manual low) provides only low (1st) gear at start-ups. At higher speeds it results in a downshift to second gear followed by an automatic downshift to low which occurs when vehicle speed decreases enough. Once in low, the transmission will stay in low until the selector is moved to another position.
* The E4OD is electronically controlled by a microprocessor known as the EEC-IV processor (electronic control assembly, ECA). The EEC-IV processor controls both the engine and the transmission on gasoline engine applications in the same microprocessor. On diesels the ECA controls the transmission only.
* Electronic control also provides powertrain system diagnostic capabilities which will result in earlier and more accurate resolution of E4OD malfunctions.
* Service technicians can detect many types of transmission concerns if they occur during the standard EEC-IV "Quick Test" on both gas and diesel use.
* Additionally, the overdrive cancel switch indicator light will flash during certain conditions which will inform the driver to go to a Ford dealer for servicing.
* The processor gathers information from sensors located throughout the vehicle which are monitoring vehicle operating conditions. Using this information, the processor determines the best operating state for the transmission. A solenoid body assembly, containing five solenoids, receives the processor signals which in turn produces the desired mode of operation.
* Altitude compensation for shift quality and cold ambient warm-up strategy are also provided in the electronic controls. This eliminates the need for changes to the transmission for operating in mountainous regions. It also allows the E4OD to operate effectively even in extreme cold.
* An overdrive cancel switch allows lockout of overdrive with the push of a button. The switch is located on the instrument panel and is useful for providing increased engine braking on downhill grades. Depressing the switch will lock out overdrive (amber light turns on). Pressing it again, will change the system back to normal operation. Whenever the ignition key is turned on, the vehicle will automatically provide overdrive operation regardless of the switch position the last time the vehicle was running.
Components from the intermediate brake drum rearward to the output shaft and extension housing seal are similar to the C-6 automatic transmission. However, the E4OD planetary gears have a higher contact ratio for quieter operation. Forward of the intermediate brake drum, the E4OD components are new. These new
> Center support assembly
> Overdrive ring gear
> Coast clutch
> Overdrive sun gear and planet gear assembly
> Pump and support assembly
> Converter and clutch/damper assembly
The E4OD has wider forward gear ratios than the C-6 as shown below.
Gear - C6 - E4OD
1st - 2.46 - 2.71
2nd - 1.46 - 1.538
3rd - 1.00 - 1.00
OD - NA - 0.712
Rev - 2.18 - 2.18
Currently there are 12 E4OD models for use in F-250/350 (4x2 and 4x4), Econoline (5.8L/7.3L Diesel/7.5L) and F Super Duty (7.3L Diesel/7.5L). For details in diagnosing, testing, disassembling and assembling, see Section 17-09 of the 1989 Truck Shop Manual. Also see the E4OD Theory and Diagnosis Technical Training Manual (Order No. 1710-012). The E4OD, like the C-6, is filled with Mercon fluid. The fluid should be changed every 30,000 miles for severe service use. See the bottom of this page for proper fluid application..."
In my site under E4OD
, I have more TSbs that were made by Ford through the years as improvements or fixes to some problems.
Beginning immediately all automatic transmission / transaxle applications requiring MERCONŽ can now be serviced using MERCONŽ V or MERCONŽ Automatic Transmission Fluid or dual usage fluids labeled MERCONŽ / MERCONŽ V. After July 1, 2007, MERCONŽ Automatic Transmission Fluid will no longer be manufactured, therefore, availability of this fluid will only continue for however long it takes to deplete what remains in inventory.
Transmission Fluid In-Line Filter Kit
After every overhaul or transmission exchange, clean, flush and backflush the transmission fluid cooling system which includes: fluid cooler, auxiliary cooler, cooler lines, and Cooler Bypass Valve (CBV), if equipped. Perform the cooler flow test to ensure proper transmission fluid flow volume on the transmission return line through the cooling system. Once proper fluid flow volume is verified install the Transmission Fluid In-Line Filter Kit (XC3Z-7B155-AA) in the fluid cooler return line (transmission fluid flow coming out of the fluid cooler going into the transmission). Refer to the following Service Procedure for details.
Overheating, Burnt Fluid Converter Clutch Discoloration, Forward Clutch Wear, Excessive Bushing Wear - Low One-Way Clutch Malfunction TSB 94-23-18 for 89-94 Bronco, Vans & F Series
Ford E4OD Changes for 1996
The E4OD transmission has had several changes for the 1996 model year.
1) The upper and lower valve body gaskets are new, and have light green stripes for identification.
2) The low/reverse clutch piston now has lip seals instead of lathe cut seals.
3) The pan gasket is now a molded rubber gasket instead of cork.
None of these parts interchange with the old parts!
& by Baumann;
"...If it becomes necessary to overhaul your E4OD transmission, you should perform as many updates as possible if it is a pre-1995 unit. E4OD component updates include, as an example, the following items:
Improved (thicker) converter clutch piston (circa 1994), prevents the formation of cracks which relieve fluid pressure from the apply side of the clutch, causing it to slip and even bluing the outside surface of the torque converter in extreme cases. Ensure that your new converter contains an updated OEM or "LuK" brand heavy-duty clutch. This can be difficult, as many torque converter suppliers and remanufacturers may not use this new style of clutch.
Higher displacement front pump (for 1995) provides more fluid capacity for faster engagement of reverse and greater lube flow.
New (for 1994) 4-pinion overdrive planet and input shaft assemblies replace older 3 and 4 pinion units which tend to develop cracks in the carrier under heavy loads.
Center support update kit (for units built from 1989 through part of 1994) replaces wear-prone bushing with a ball bearing and contains a new overdrive stub shaft.
Stronger overdrive clutch cylinder snap ring which will not dislodge.
Revised sun gear and rear case bushings (circa 1992 model year) provide longer wear life and better lubrication.
Four pinion planet carriers (first used in 1992 model year)
New forward clutch friction plates with hardened internal splines cure "chatter" and "no-drive" conditions in E4OD and some later C-6 transmissions."