That will slow everything down 28/29.3= to 95.6%. Not a real big deal. The point I was trying to make was the wide splits. If the 440 has a low rpm cam in it, then it will pull the splits ok WITH the right rear gear. IMO the 3.91s are the minimum with the 28s. With 29.3, that would now be 4.10s..With this trans, it's all about making second gear happy. I would leave the 3.91s in there and see how you like it.
