Originally Posted by dan_vector

Not a huge amount. Just the new bits from the 748 gas car such as the new 'TQ' diffs. The motor mount arrangement, centre pulleys and the way the top deck connects makes the 748e flex in a more uniform manner. I had the 747e which was a conversion from the previous seasons gas car and now a fresh build 748e and the 748e is definitely a better car than the 747e.