Dexron-IIE (GM Spec GM6137M) was introduced quickly after Dexron-IID; the IIE formulation is to address excessive hygroscopicity IID so make it more suited to hydraulic systems
DEXRON ® is a registered trademark of General Motors Corporation. DEXRON®-IIE fluids have been surpassed by later DEXRON® fluids. In general, the use of a DEXRON®-III or DEXRON®-VI automatic transmission fluid is recommended.
If you're unsure which DEXRON IIE Oil is correct for your application, or have a modified or unique vehicle feel free to get in touch for a custom gear oil recommendation.