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The 400 and 350 output shafts are different spline (30something vs. 27). Also, the 350 is longer. There are several adapters on the market to facilitate the changeover. You may have to change the output shaft on the 400 to connect to the x-fer case (or possibly the input on the x-fer).
I've been looking at the options to put a 400 on my 'Burban since the 700 is broken.