Replaced rear pinion bearing, fresh lub, replaced race and sleave. noise is still there. while drive shaft is not connected the pinion shaft it is locking up in the differential. only in forward not in reverse. should the pinion shaft be little loose or tight.
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Re: 1995 jgc limited rear end noise
If you removed the pinion and only replaced one of the bearings that was a mistake. You need to replace both at the same time. Also since it is a Dana differential you should have replace the crush sleeve also as this set the correct preload on the pinion bearings.
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if the noise is occurring on acceleration it will be the rear pinion bearing
if it is on deceleration it will be the front pinion bearing
if it comes and goes s you drive normally it is the incorrect mesh between the crown wheel and pinion and indicates worn carrier side bearings allowing the mesh of the crown wheel and pinion to vary
check for correct oil in the diff and check magnet on drain plug for metal bits
If you are definitely sure it is coming from the rear end you have to remove the rear end cover. You will see the condition of the fluid check the fluid while that is being done. You will have a bird's eye view of the condition of the ring and pinion gears and the pinion bearings. The rumble from the rear end is usually a bad pinion bearing.
If you're not sure it is the rear, another often overlooked problem is the rear universal joint on the drive shaft. You have to remove the drive shaft to check the pinion bearing so you'll find the "U" joint is bad right then and there. If the joint is bad, don't cheese out, get both of them replaced.
Check drive shaft assembly for worn u-joints.if OK check for worn pinion bearings or loose pinion nut.This can all be check shaking drive shaft at each end and looking for slop in u-joints or pinion flange.
Sounds like you could possibly have a pinion bearing issue. Have you had the pinion seal replaced recently? if so, sometimes the nut that holds the yoke on the rear differential gets over-tightned causing the pinion bearing to be too tight in the race, therefor damaging the bearing assembly and causes a "chattering" sound. When a pinion bearing goes bad in these Jeeps that is the noise they will make, even at lower speeds. Hope this helps..
The ring gear is bolted to what is called a ring gear carrier, the carrier is bolted inside the rear end housing with two bolts on each side, it is shimmed on each side to adjust backlash and pinion depth so DON'T mix up the left and right carrier shims, once the carrier is out with the ring gear attached you can remove the pinion shaft and drive out the bearing races of the pinion bearings. You also need to remove the pinion flange where the drive shaft U-Joint attaches, just hammer it off with a brass faced hammer (a steel hammer will run the flange) once the large center nut is removed.
THE LEAK is an axle seal leaking the noise is bearings in rear end could be axle bearing of carrier/pinion bearings while driving shift weight of truck side to side see if noise changes if so it is axle bearing if not then most likely differential bearings
Use white paint, chalk or a scribe to mark the relationship of the front U joint to the front diferential pinion yoke. Mark the relationship of the rear U joint flange to the transfer case companion flange. Unbolt the front end of the drive shaft from the pinion yoke and the rear end from the transfer case companion flange and remove the drive shaft from the vehicle.
hope thei info helps.
checking the bearings is a great place to start. to take the axles out you will need to remove the tires and axle cover in side there is a center pin with a single bolt holding it in. remove the bolt and gently pull the pin out DO NOT ROTATE THE AXLES after you remove the pin this will cause the spider gears to fall out of place. once you have the pin out push the axle in towards the ring and pinion and ther will be a c clip to pull out i use a magnet. installation is just in reverse just be careful not to turn the axle sometimes lining the spider gears back up can be a pain. hope this helps