any one know of a web site that shows how to change the rear seal on 98 tahoe. or can someone tell me how? It just started leaking and someone said they were easy to replace without taking it to the garage.

Axle seal? pinion seal? what are we talking about here?

pinion seal

Remove the U-joint straps from thre pinion yoke. put a dimple on the yoke, the pinion shaft and nut or a suitable reference mark for the proper torque of the nut during re-assembly. Remove the pinion nut preferably with an impact gun. Note the posistion of the yoke for re-assembly. Tap the yoke loose from the pinion shaft. Remove the seal.

Install the new seal. Install the yoke in the original posistion. Install the nut and tighten down until the dimples or reference marks line up.

Do not over tighten the pinoin nut! There is a crush spacer that was installed during the original set up for the proper preload and pinion to ring gear set up. This is the reason for the reference marks and yoke posistion.

To add to toddman67's excellent advice. Make sure you count the exposed threads before removing the pinion nut. Also clean the nut and pinion threads and apply a small amount of lock-tight to the threads prior to nut installation. You can remove the nut with an impact but install it slowly by hand or ratchet until you reach the number of exposed threads and scribe marks.

Remove the U-joint straps from thre pinion yoke. put a dimple on the yoke, the pinion shaft and nut or a suitable reference mark for the proper torque of the nut during re-assembly. Remove the pinion nut preferably with an impact gun. Note the posistion of the yoke for re-assembly. Tap the yoke loose from the pinion shaft. Remove the seal.

Install the new seal. Install the yoke in the original posistion. Install the nut and tighten down until the dimples or reference marks line up.

Do not over tighten the pinoin nut! There is a crush spacer that was installed during the original set up for the proper preload and pinion to ring gear set up. This is the reason for the reference marks and yoke posistion.

To prevent over or under torqueing the pinion nut, prior to disassembly use an beam style inch/pound torque wrench to measure the rotating torque of the pinion...when reinstalling the nut, tighten the nut untill you add 3-5 in/lbs more rotating torque