Spin Werkes USA wheels mostly, have an agent in Johannesburg and they make em to custom offsets/sizes/width.
Heres a pic of mine 15 inch with 10,5 inch MT rubber (which weighs more than the rim)

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I believe they are both 4 AGE Turbo plus Nitrous. Can't believe they get such good traction on an unprepared track, after years of battling I never got the wheels off the ground like that!

Nitro raceway JHB SA - the black one ran 10,24 @ 219km/h.

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Anything that comes to a stop along THAT stretch of road will be stripped down to the bare bones within hours - whether its a bakkie or a cow. My mate pranged my work ute into a cow on the same road, luckily he got it towed out before anything happened.

Lowered suspension - African style - bwahahaha!

From a recent newspaper article (East London-South Africa)

A DELIVERY man driving a small bakkie collided with a bull and was forced to drive about 15km to a local police station – with the animal securely lodged on its roof.
After the motorist rammed into the bull on the R345 near Peddie at around 6am yesterday, the bovine somersaulted in the air and landed on top of the bakkie, alive but dazed – and trapped in the bakkie’s roof carrier.
It later turned out that the unfortunate bull suffered a broken leg and had to be put down.

A crane was used to remove it from the top of the damaged bakkie, said Johan Jooste of Ngqushwa traffic services yesterday. The SPCA was also called to assess the beast.
Jooste, with 27 years experience as a traffic official, said he had never seen anything like it on the job.
“ There was this (bull) on top of a roof of a tiny bakkie … it’s as if it was saying, ‘this is my lift’,” he said after dropping off pictures with the Dispatch.
Jooste said after the driver reported the case to the Peddie police, he simply left his bakkie at the police station, jumped into a waiting vehicle and went about his business.
His bakkie also may not live to see another day.

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Junior, check this site out http://users.tpg.com.au/users/loats/technical/ma61/gearboxes.html
I ran a W58 in my ute. If you still using A12 or 14 motor, have a sandwich adaptor plate made to get the fit

My advice would be the 8" hilux diff. If ya look in the SUMMIT catalogue, there is a complete centre section available for it made by Detroit Locker & another by Powertrax, bound to be able to handle abuse!
You can shorten it too if you wish and i've seen many with modded bolt patterns. My next project WILL have this in it.

Check out the following site:
http://users.tpg.com.au/users/loats/technical/ma61/gearboxes.html

All the facts, very informative, no BS

t50 will work just fine, I can tell ya its a hell of a lot lighter than a W58, and it can take a fair amount of punishment n/a, as my mates with 'rollas have proved. cheers