You can blame the government for reduction in old iron on the road. From what ive heard, it changes all the time, but by the 1st of the year al 96 and newer trucks must be retrofitted with DPF system or replaced. 95 and older, again from what ive heard, have till the end of next year and must be replaced. All these regulations are due to emissions. The 95 and older trucks are mechanical unless theyve been updated to a newer electronic motor. So the government says that since it wasnt originally electronic, it cant be retroed. Now im all for the better emissions, cleaner burning, but they say its improved fuel efficency. Id really like ask the pencil pusher who wrote these regulations, How is the 2013 Cascadia getting 5.5 mpg, more fuel efficent than the 87 379 getting 8.5 mpg?!?!
Now that all the old trucks sooner or later are gonna be off the road and not allowed to work, are gonna get restored by those who can afford it and have the abilities to, and they are only gonna be seen pulling RV trailers and parked at shows/contests, it got dang shame that loud pipes and cool old trucks working are gonna end. There are some cool new trucks, there will be more. The industry needs to adapt, and accept it. The government isnt letting go of this.