new HPL diff and tcase fluid front to back and greased the zerks pushing out old (different brand) grease. Which was easy and mess free (sarcasm). The lock N lube fittings and a judicious battery powered grease gun for the spider yokes was clutch compared to the manual type. I'm close to 90k on the odo. What's everyone's typical interval for tcase/diff fluid? 30k? More? TIA.