Two words
Slippery hills!
The Isuzu does not rev hard enough for climbing the slippery hills, and does not have enough power to pull a higher gear to compensate for the extra revs you get out of the V8.
I've done quite a few hills with both difflocks in, Silverstones MT117Ex's on less the 15 Psi and pulling over 3500RPM trying to climb hard packed red clay hills. This is something you just cannot do with an Isuzu.
I remember a trip I did years ago where my 90 with a 2.5 petrol climbed a slippery hill easier than an Isuzu county, as the Isuzu driver said when he finally go to the top, "I was using all 3200RPM to climb that!"


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Gerry you're right - you were talking about the 4BDI versus Rover V8's and Big Jon hijacked it with a thread about tanks and trucks and diesel fuel.


Setle petals!!


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