Look at the engine tag under the hood it's right there. It most likly is 4.625, 4.88 are very very rare.

I'm not the expert on this but It was my understanding that there are no aftermarket gears. We have front and rear lockers for some models and some custom xfer case gears and that is it.

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98 Montero with cold weather package
96 Toyota Land Cruiser, fully locked Mall Machine :-)