I recently installed a Z1 Platinum series driveshaft and the car started having a shutter which only appeared under hard acceleration. Other than that, the car ran perfectly smooth. Silvertwin(OH) suggested that I change the transmission mount sine on an 18 year old car, they tend to sag and cause some misalighment during acceleration. That cured about 90% of the problem, however there still is a little bit left. If the tranmission mount was worn, do you think I should look at replacing the rear differential mounting bushings as well?