Sails posted:

hi Kelli,
a lot of the Rodeo 4x4s came with rear LSD as standard. they use a ramp style diff. You can check if your vehicle has one as standard by using the www.redbook.com.au site, and follow the prompts.
I went through the same process, and found the vehicle I'd purchased had a LSD fitted, but there was no indication on the diff housing or any where on the car to say so.
a second hand LSD try a 4wd wrecker,such as "Franks Commercial Parts Plus". Smithfield in Sydney, 02 9609 5444, or parts@frankspartsplus.com.au. They had diffs for $600.00, with a part exchange on a good diff for $200.00. Make sure you get the diff with the small centre piece in it that puts load onto the ends of your axles. i dont know the technical terms, but if you enquire from a good diff shop, like Craft Diffs at Granville, they will be able to give you a good understanding , as they did for me . As a novice I had good treatment from both those shops .
Good luck