Ford E4OD/4R100 Solenoid Pack 1989-1994 This auction is for NEW E4OD 4R100 Solenoid Pack. If you are experiencing shifting problems you may want to consider replacing this Solenoid pack. Don't put a used part that has already proved failure back into your rebuilt transmission replace it with a new one; save yourself from a future problem. Note: If you need any other parts for your E4OD/4R100 please check out our store! There is a shortage of cores in rebuilding these solenoid blocks with our Sonnax rebuild program, we are encouraging you to return your old solenoid core by providing you with a pre-paid UPS call tag. While we don’t charge a core on our New solenoids we do ask if you can return them to do so. Please help us recycle these solenoid blocks for the future.