Recon or replace TB45 GU 2000 Auto?

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Hi guys

Have a tired 4.5 ltr that is on gas/petrol, I was planning to get the gas removed as our only fuel station for 160kms no longer sells gas. We live rural South West of WA. But before I do that ...

It has done just under 250000 kms, it is really tired and struggles towing and going up hills. I've owned it since 2009 when I got it at 92000 kms. It has been getting worse over the last 12 months to a point I need to do something with it. For the last 3 years it has primarily been used as a towing workhorse vehicle for a large 2 horse float. We have lots of hills and winding roads. on a steepish incline we often have to go back to 2nd (Auto) to get up the hill, even when not towing it is not a lot better. It guzzles fuel that I may need to hire a tanker to follow me.

Unfortunately I don't have the funds to just go out and get a newer vehicle, so I am looking at my options to recon or replace the tired 4.5.

I've read quite a few posts where the recommendation is to add a turbo to it to overcome the sluggishness

Anyone have an idea what this would cost to do? Is it worth doing? Am i better to use my existing motor or buy a already reconditioned motor?

I'm not interested in buying a motor from a wrecking Patrol as I don't know its history.

If anyone knows someone that can do this for me in the South West of WA (Bunbury to Albany region) let me know.

Cheers

All