I think the LS fits in but you lose the 4WD as nothing downstream can take the grunt.

there's a video somewhere of a Defender with a truck Cummins engine in. Same issue I think. A 2WD defender? Like a turbo on a push-bike.
I've seen a P38 with a HMMWV Cummins and it retained the 4WD. IIRC, it was using the standard P38 drive train. And I recall a range of P38s that came with a 6.5l LS motor in them. If this old bus can take that sort of power, I'd be surprised if a Defender couldn't.
 
I've seen a P38 with a HMMWV Cummins and it retained the 4WD. IIRC, it was using the standard P38 drive train. And I recall a range of P38s that came with a 6.5l LS motor in them. If this old bus can take that sort of power, I'd be surprised if a Defender couldn't.

James Martin question! But I don't think the old Defenders could take that much torque. I'm pretty sure the P38 gear is heavier duty.
 
In Australia the defender came out at one time with a 4lt Isusu diesel and that was a real stump puller with planty of torque and that engine was also fitted to the six wheel drive army defender out here and a friend of mine has fitted one of those engines to a classic and has done some awesome desert trips in it like the strezleckie track , french line Oodnadatta track , Gunbarrel highway, and the birdsville track which can be done in a two wheel drive holden these days. If you want any history of these tracks get some books by Len Beadle who was the surveyor and made these track with a team of 3 people and a bulldozer and grader back in the 1950s.
 
i had a 127" doublecab hi-cap with a 7.2 or 7.4 chevy big block,it had salisbury axles front & rear but still snapped half shafts,
 
Was that off road or under acceleration?
on road from standstill you couldnt hard accelerate ill try & find some pics as they are on a old nokia memory card & poor quality,it had a 4 barrel holly sticking out the bonnet with a guard around it which fitted perfectly inside the bonnet mounted spare wheel
 

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