The only seals on the driveshaft itself would be on the slip yoke. You're probably thinking of the pinion seal, which is at the front of the differential, behind the input yoke to the differential.
There could be several possibilities that were offered on that vehicle. You could remove the rear cover and count the teeth on the ring and the pinion, then use a calculator to divide the larger number by the smaller number to determine the ratio.
All Chevy Celebrities have rack and pinion steering.
remove the differential cover,remove pinion shaft lock bolt,withdraw the pinion shaft part way,then rotate the dif untel the touches the case give you enought room to access the C-locks on the axle remove the C-locks,insert the pinion shaft back in,pull axles out,you need a slide hammer with a axle bearing remover attachmment to remove and bearing driver or a large socket reinstall good luck....haynes repair manual wll show you step by step
If doesn't have the rubber plug in the back cover it will have a threaded metal plug on the passenger side of the carrier housing near the pinion yoke. It takes a 3/8" square male drive to remove it.
A bad pinion bearing in the differential is to blame
There is no specific pinion nut torque. The pinion nut has to be tightened until the proper pinion preload is established. Pinion preload is what matters
You have to open the differential and remove the retaining pin from the spider gear to remove the axle shaft.
To determine your diff ratio, remove the cover, count the teeth on the ring gear, then count the teeth on the pinion gear. Divide the ring gear number by the pinion number.
does a 1992 Chevy 2500 2wd differential have a vent tube
There is either a problem with the actuator in the front differential--BAD ACTUATOR. Are there is a problem with the differential ---RING and PINION asembley.
You have to remove the differential cover to drain the lube. It should take aprox 4 pints to refill it.