242177P: Yes, the 400 is a better trans, but 350 is a good trans. I have never broken one yet. I never put it behind a high horsepower motor tho. LOL, To put the 400 in 66, the crossmember must be moved back and different yoke and shorten the drive shaft. It was years ago like early 70's I put in a 455 and 400 trans. In order to mount the trans, we had to weld an extension on the crossmember and bolted it straight to the frame. Needless to say, even back then, finding a crossmember for a convertible was not eazy when I changed it back.
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connman
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