I've got a 1990/1991 Non-turbo diesel rodeo DLX,

The diff is starting to roar and has some serious play, so I figure swapping it is probably the best/easiest option. But local wreckers rarely have this model, and I haven't been able to source one without ridiculous pricing.

Shortly after 1991 the rodeo diff changed though the rest of the drive train seems very similar if not identical. I'm not sure how much but its visibly different, though it should bolt on fine.. There are a heap of these 93/94/95 diffs around, so I'm wondering if anyone knows whether they are actually interchangeable? A slightly different ratio would be fine, as long as it actually fits!