check fifthgearrepair.com for the simplest/cheapest way to fix the fifth gear---it is a simple process that an average mechanic can do in less than one hour---the only failures i have heard about are cummins powered units where the tranny is lugged under load in fifth gear--chev 454 and dodge V10 ones dont have the 5th gear issue so i wouldnt suspect your motor will take it down...bob