I have fit new bearing on pinion and crown but diff is noisy. how do i adjust to stop the noise?

SOURCE: ring and pinion adjustment

hello sir ...

RING AND PINION TOOTH CONTACT PATTERN.—The ring and pinion tooth contact pattern is used to double-check ring and pinion adjustment. To check the accuracy of your adjustments, coat the ring gear teeth with a thin coat of red lead, white grease, hydrated ferric oxide (yellow oxide or iron), or Prussian blue. Turn the ring gear one way and then the other to rub the teeth together, producing a contact pattern on the teeth. Carefully note the contact pattern that shows up on the teeth where the substance used has been wiped off. A good contact pattern is one located in the center of the gear teeth (fig. 5-21). Figure 5-21 shows several ring and pinion gear contact patterns. Study each and note the suggested correction for the faulty contact

SOURCE: noisy diff

diff bearings on way out jack both rear wheels off the ground --turn them by hand good chance you will pick up which side and how bad but it wont keep going for long the longer you leave it the more parts could get damaged

SOURCE: Rear drive train seal had

Yes its very much possible that they must have moved the bearing alignment.And this caused the problem.---------But if the bearings are already worn out,then as per dealers side he is right.If the bearings gets worn out then it can make the seal leak.------------ If the seal is leaking then all you have to pull is the yoke. Pull the seal out and put in a new one. Then install the yoke and tighten it back down.The best way is to mark the nut and pinion before you losen it. When you retighten the nut you will have the same bearing preload. The question is: Did the seal just wear out or did the bearings go bad and they took the seal out? This sounds like a great time to rebuild your differential. New bearings, gaskets and seals. Be sure to pre-lube all the bearings and seals when you install them. It can take a while for the gear lube to get where it needs to be.------------- But if the bearing is got misaligned while fitting,then yes it will cause the damage.-----------Crown wheel got damaged, without disassembling its hard to tell if its damaged.But its not easy to disassemble the crown wheel. ------------ The pinion bearings are fitted to the casing and measurements are taken using Ford tooling to determine the size of the pinion bearing spacer required. A spacer is then made. A trial assembly is then done with the crown wheel and pinion together with new pinion bearings and new carrier bearings and everything is set up to obtain a gear tooth meshing marking.In the final build a specially made pinion bearing sleeve, a new seal and pinion nut are fitted and the pinion bearing rotational torque is set using Ford tooling. The crown wheel and carrier assembly are then fitted and the carrier bearing pre-load and crown wheel and pinion backlash are set up using Ford tooling.-------------And for all this professional tools are required to be checked.Because if wheel is damaged,it has to be replaced.------------- As per the conversation which you mentioned.On that basis it indicates that,if bearing was already faulty,then why the dealer did not tell you while replacing the seal and u joints.He must be aware of that.And if in case the bearings were proper,then its his mistake that he do not fit the parts properly and this caused the problem.----------Still to get the car repaired you can insist the dealer,that he charges less for this repairing.because this repairing is not a easy job for local car mechanics.The dealer has all the required tools as well as torque specifications.So he is the best man to do the repair job for you.But still you try to reduce the repair/service charges,how much you can.----------------- This should help.Thanks.Helpmech.