If you're going to a 4L80e, they do make banjo fittings for the trans side, which is a good thing.
They probably make them for TH400s too, but I haven't looked.
https://www.ebay.com/itm/28484860235...CABEgJcMvD_BwE
The make the banjo ones without the extension too, depending on the model of trans, you may need them.
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