This really depends on the track and the nature of the corners and your gearing. Since we all use stock transmissions, the only thing we can change is the rear end. We use a 4.88 but will build a 5.12 I think it is for later this year in a separate pumpkin. In CENDIF, a track like Gingerman might be a good candidate for a 5.12 as it is slow with lots of tight turns and we think we might pick up about 1/2 second on lap times, but on the longer faster tracks 4.88 is probably the best, although one might argue that some tracks might even use the 4.4. (Road America?) What we all need to do is do some calculations once we get corner entry and exit rpms and see what corners we might be able to use the extra umph and where the new gearing might cause an extra gear change with the alternative gearing. That to me is the tradeoff.

Dick Plank