A/T - E40D Pump Modifications
TECHNICAL BULLETIN # 290TRANSMISSION: E4OD
SUBJECT: Pump modification
APPLICATION: Ford
Pump Modification
The following pump modifications are recommended for improving lubrication and converter clutch apply
Step 1
Remove the OD planetary lube plug. This can be done by driving the plug into its bore until it comes out the other side, or it can be pulled out with a screw extractor (figure 1).
Step 2
Plug the hole as shown in figure two then stake the plug in place. GM part number 8611710.
Step 3
Install a spacer on top of the first plug as shown in figure three, then install a second plug. A spacer is optional but is a good safety measure in case the first plug comes loose. The spacer (if used) should be long enough to touch both plugs. For example, measure the depth of the hole after the first plug is installed. Subtract the height for the second plug.This is the length of the spacer that is needed. After installing the second plug, stake it in place. GM part # 8611710 can be used for both plugs.
Step 4
Remove the stator shaft from the pump cover and drill a hole as shown in figure four. Use caution while removing and replacing the stator shaft so as not to damage the pump cover. Heating the pump cover before installing the stator shaft will help the shaft go in more easily This can be done in a hot water parts washer. Remove any shavings from the casting before installing the shaft.
Step 5
Drill through the wall of the pump cover as shown in figure five.