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If you must do this sort of 'tuning' do it well before you head off on the big trip, don't risk new 'issues' when a long way from anywhere.
Added 'complexity' may make getting mechanical assistance in out of the way places more difficult. KISS is best.
We live with 'slow' up hills in favour of reliability with our 4.2, in fact we have slowed down quite considerably overall. Commonly sit on 80kph on highways & slower on dirt. It doesn't feel difficult to do, in fact it is both more relaxing & fuel efficient. What's the rush?
Mostly when away from cities & the east coast the roads are sparsely populated, so holding up traffic is a non issue, & we still have plenty of 'go' when in situations we need it.
Tassie has a lot of mountains - 2nd gear climbing on highways was common.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)