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"From the factory your 1998 would have come with a chrysler 8.25 rear and Dana 30 front" This is not always true - 1998 models with ABS used the Dana 35.
If the axle has flat webbing across the bottom, it's an 8.25.
ABS always got a d35, non ABS USUALLY got an 8.25 but may randomly have a d35 as well, depending on whether the factory ran out of 8.25s that day or not. Basically, to reach any kind of reliable conclusion, you have to look at it.
Front Axles
Dana 30 high pinion - reverse cut - 27 spline, 1.16" diameter shafts, 7.13" [COLOR=blue !important][COLOR=blue !important]ring [COLOR=blue !important]gear[/COLOR][/COLOR][/COLOR] - used 84-99 (some axles through 91 are vacuum disconnect, 92+ are non-disconnect, 89-95 with ABS have 5-297x u-joints, all 95+ have 5-297x u-joints, all others have 5-260x u-joints except 84 thru 86 they were CV type rather than open u-joints)
Dana 30 low pinion - standard cut - 27 spline, 1.16" diameter shafts, 7.13" ring gear, 5-297x u-joints - used 00-01
[COLOR=blue !important][COLOR=blue !important]Rear [COLOR=blue !important]Axles[/COLOR][/COLOR][/COLOR]
(Note on Dana 35 axles sometimes referred to as Dana 35C - The "C" does not stand for c-clip. It stands for "custom" meaning it came from Dana unfinished.)
(Note on 8.25 axles - none of these axles were used on XJs with ABS brakes. If you have ABS, you have the Dana 35. Without ABS you could have either axle. 8.25 axles are c-clip)
The low pinion D30s on the 00 and 01 XJs are the same front axle used on the TJ Wranglers (with the exception of Rubicons that used a D44/D30 hybrid). The high pinion version is stronger because the reverse cut pushes the ring and pinion together instead of pushing the pinion away from the ring gear.