I am newbie, I am the proud owner of a 1998 Dodge 3500 dually and am slowly working on upgrading as I can, this truck has the 12v with a 5 speed and 3;54 rear end gears. It also has 250,000 miles on it. I have replaced the transmission and clutch and u-joints. This is a work in progress, have been driving the truck for about a month now, absolutely love it. I have installed a Magnaflow 4" turbo back exhaust system and I will be installing an air intake system, along with a fuel filter relocation kit. I am also thinking about putting in the FS-2500 by-pas oil filter. Any pros or cons? By the way, I had always owned a Chevy or GMC truck prior to this.