Brett, I know Max will respond to your questions when he wakes up but I reckon you are dreaming about 38's on a Hilux. That will simply be too big. Generally anythng over 33" will require cutting and trimming of the body mount on the chassis behind the front wheel. Some people have fitted 35" tyres wth a body lift and a 3-4" suspension lift. I can help you with a body llift kit (see Vehicle Modifications Network ). By the sound of it you will see more mud than most, so I would stick to a fairly narrow tyre and possibly consider an extreme tyre like the Interco Swamper TSL or a Simex Jungletrekker. We are pretty sure you would get a 34x10.5x16" Swamper TSL fitted with a body lift and suspension lift. If you are going to run a big tyre (35"), than I would suggest getting the 4.556 thick cut crown wheel and pinions from JTs Parts & Accessories, Justdifferentials.com If you can work out a way to get 38's on board then probably their 4.8 gears would be a better bet. I think they also do stronger axles. I reckon from your description of driving conditions, momentum wll be really important to you so I doubt there would be much need to add the crawl box that Max has and therefore the diffs are a better option for you. You'll need some sort of suspension lift and given your location, I would recommend you consider importing a Tacoma front coil over front suspension kit from the US. (eg. Camburg or Total Chaos etc). The Tacoma has a different lower control arm to the Hilux so the long travel kits used in the US won't fit. As far as the rear suspension goes, start with gettting the factory springs reset and maybe add longer shocks. You should be able to get custom leaves made locally in a spring works and you might be able to get some preformance rear shocks when you get your coil over kit. There is a lot more Hilux specific info on Newhilux.net - The Ultimate online Hilux community!