The trans cooler fittings from a 4R100 take 3/8" lines and are a direct fit to an E4OD. You would need to either run the 4R100's bypass with them or buy aftermarket spacers to take the place of the bypass tube. You can use a set of Superduty 4R100 cooler lines and mod them to fit or bend up your own from scratch.
E40d trans cooler lines
The stock lines on our e4ods are tiny 5/16? I think ... Stupid in my books I think jasper engines makes a kit that is 3/8 lines. But it comes with a cooler my question is there any other kits that have the transmission case fittings and 3/8 lines I want to upgrade a 3/8 mod will run cooler and have more flow than a 5/16 set up and more oil flow means more heat it can absorb to cool our trans Any help or suggestions will help.
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So you are saying I can just undo the 5/16 lines and bolt on the 3/8 . I don't need to change the trans case fittings to accept 3/8 lines
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No, I'm saying when you use the fittings from a 4R100 then you can use 3/8 lines. The stock E4OD fittings can only use 5/16 lines.
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