Didn't know if I should post this here or in the hipo section but here goes. I'm going to hang a Gear Vendors on the back of my sm420 trans. The guy at gear vendors told me the front driveshaft has to be no less than 24 inches to the carrier bearing. If I listen to him, it means deleting the carrier bearing and lengthening the rear shaft which will cost more and I'm already bleeding pretty bad. Does anyone know why I can't have a front shaft of say about 10 inches?