Yeah, i was running 18.9 about 1.5 years ago, was down to 16.9 at the end of last year, still havent rebuilt the trans .... but did the exhaust like hypoid said.... Running 16.3 now, and have to tune the carb because it is running too lean ( need to increase primary and secondary jet sizes alot). After i do that , and install the valve body i modified hopefully ittl be running 16 flat, or even hit a 15.9...then its time to start building a real truck to race, maybe a 2wd truck this time...and then retire mine to being a tow vehicle/backup truck to race...

--John