help please !

[JT Marshall]

Thanks RICM... i watched a build on you tube where the lower shaft was modified and extended to become a drive for the front ex.. they reason I asked about the tranny vs twin engine reduction is cause from my understanding if I do the twin kit my gearing will be reduced before it enters the tranny vs a aux kit which done the same way would reduce my rear gears by 4:1 but leave the front stock since the reduction's after the tranny.. would that cause excessive drive train wear compared to a stock truck?