The question will plague you for years ,You need to measure what pulls you want to attend, Local pulling groups ,Rules, if You plan on pulling for fun or to be competitive. We have both trucks 2.6 & 3.0 the cost to be competitive is enormous. The initial cost to build a 3.0 truck will be $50K more then 2.6 in reality. With the power we make today the 2.6 DL just cannot support it unless you are willing to do repairs weekly under current rules, I was disappointed in our 2.6 truck this year it was down for 1/2 the season and the cost on the repairs $$$$ (Plus labor hrs) weekly. If we Decide (3 of Us) to stay in the 2.6 class the cost for the upgrades will equal the 3.0 and according to current rules still be struck with the 1 ton T-case rule even if they go open on R-axle.
If you attend the PPl events in 3.0, the competition is brutal. the 2.6 class requires more qualifying ( more stress on the truck) for the big events. and very competitive also.
Whatever You decide always remember it the heart of the sport that counts BC its next to impossible to win regularly/Weekly. Their will be set-backs in any pulling season just keep moving forward and when the season ends it will be 1 hellva accomplishment:Cheer: