400E transmission vs. 500E Transmission

[alabbasi]

Understanding that the 400E transmission has a 1st gear start valve body. Is there any other difference between the two transmission? I have an E420 parts car and a 500SEL Engine. I'm wondering if there's any other issue with fitting the E420 Transmission with the 500SEL engine before installing it in my 500E.

Thanks

 

[gsxr]

Should be 100% plug+play using the 034 transmission in the 036. AFAIK, everything else is 100% identical besides the valve body, and you want the FGS valvebody anyway.