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79-04 rear axles will bolt in as they have the same mounting setup. only difference is the 94-98 have longer axles for the disc brakes and 99-04 have longer axle tubes and axles due to wider boby
Also depending on what gears you have currently you may just want to swap out axles and brakes and keep your housing. I know my 91 came with 3.45 gears and most 94-04 rears came with either 2.73 or 3.27 gear.