while driving home my rear end diff started making a whining noise while driving and even more so when i slow to about 30mph.. i went and bought a bottle of 80 90 diff fluied and put it in ,.hoping the noise would go away but it did not!!!!

what i want to know is ....is one bottle enough or do i need more then that?? also after i put that bottle in there i tried to check level with my finger and i could not feel no oil!!! its not leaking i just wander if i need more fluied???

has any one had any expirience as to what im talking about i hope its not toasted.,it runs and drive ok with no noticeable interfearance during driving accept for the whinning noise,.,.more so when i slow to about 30/35mph?? any one help me here??????im very concerned..........

 

Add more oil. It should come up to the top of the fill hole. It is leaking somewhere or it wouldn't be empty.

 

ok here!! i got a better idea of what is happining here...

first of all since i jave put the new fluied in i have found out where it is leaking from>> its coming from behind the yolk that the drive line is connected to {the yolk that the carrier barrings bolt to}

now what i could realy use right now is a diagram of what is behind that yolk,.,.this way i could see what is behind that yolk like i know there is a seal but that could not possibly be whats causing all that noise right?? \

Is there berrings behind the seal??

 

Yes, there are bearings behind the seal. There are lots of bearings in the rear, and if it ran dry at least one of them is making it whine.

 

Their is a bearing on the pinion shaft. To change that you will need to pull the carrier.

youll need the new seal and a crush sleeve for reassembly.

 

diagrams....... diagrams.........

i do understand better with visual aids ....lol i am confused of the names of these differential parts ..... for example /./ the yoke from the difff is where i am leaking fluied ,,,, so what i need to know is how to get the yoke out and new seal or bearing replacement for that area...... i do not what to have to take the cover off or even drop the rear end for that matter.... just want to replace the parts im talking about..............

also regurarding the bearing or seal that im talking about ,,,, a broken or worn out seal / bearing from the yoke cause a grinding type of whine???????????

 

Here is a pic:

 

thanks bro thats exactly what i was looking for
now i wonder how hard it will be to get the yoke off??

 

It's time for you to get a shop manual so as to know what you're getting yourself into. It all comes apart pretty easily, it's putting it back together that's the trick.

 

The yoke isnt hard to remove the pinion gear might be fried on to the bearing if its been real hot. Assuming everything does come out your going to want to replace the bearing races as well since the bearings ran dry in the races. You might consider pricing all the seperate parts and comparing it to what you can get a used rear end for. You might be getting off cheaper slaping a used rear in it, that and most DIY people dont have a press handy to remove bearings or the proper tq wrenchs.

 

damn bro you make it seem difficult!!lol am i realy gonna need a press just to remove the front bearings?? i dont have time to change rear ends compleatly ,.,.i have court orderd work release and its 30 miles to get there 3 days a week,.,.and how could the parts i need be more then swaping a nother rear end??

 

If youve never done it before it will take you a while to get it apart and back together properly again.

If you start adding up the prices for all new bearings, seals and crush sleeve you could probably go buy a used rear for the same price.

I think it would also be faster to swap out the entire rear rather than tear apart the one you have, who knows, you might pull the cover off and the spider gears roll out and hit you in the face!

 

oh man im not feeling good about this at all ...........the front bearings and seal could not possibly cost that mush right??

 

If ones gone then the rest are most likely on their way out too, theirs quite a few bearings in there and it would suck even more if you had to pull it apart 6 times to change different bearings.

If your running a posi its probably burnt up too.

 

I would search the site and / or junkyards for a used rear end. You could probably pick up a one-wheel-peel drum brake unit pretty cheap, and imo it will not be any harder to swap the entire rear end than to fix the internals.

 

Taking apart and putting a rear end backtogether can cost much more than a $100 wrecking yard replacement rear and an afternoon to swap them. Changing a front pinion bearing and race means tearing down to the bare essentials. Don't bother -- it ain't worth the time, trouble and huge expense. ...been there -- done that!

 

Yep you need alot of tools to do it right, by do it right I mean do the job at all. If the pinion bearing is toast and it most likely is since what you describe with the noise and leak it will be A.cheaper, B. quicker and C. a more perminent fix to just slap in another unit. It shouldent take more then an afternoon to swap rear ends, if you have never worked on a differential it will take longer then that to fix your problems if they can be.

 

ok comon here guys im just gonna be replacing the fron pinion seal and bearings i dont need to go and take the cover off at all just remove the drive shaft and yoke,..,and today i went and bought the bearing and seal today.,.,i did not get the runner / cup ..because i have replaced front wheel bearings befor in lots of other cars and they worked fine.,,.,..,

now the bearings and seal total cost me only $25 im realize that it could not be just the bearing in the front.,., but the rear in the differential as well but this is the chance im taking.,.,if not then im just screwed.,,..,i only needs to get this 91 r/s to get through 3 more months then i will be able to swap rear ends compleatly,.,.!

 

If you think it's that easy, go for it! Good Luck! Don't listen to anyone else's advice, we don't know anything. Just line up a used rear, because you're going to need one shortly.

 

wha perhaps youv had one to many bro! im here to learn.,,.who u speakin for when you say "we dont know any thing??" you just being ignorantly sarcastic??...i at least am gonna put in a new seal to hold the fluied in.,.,i realise that ill need to replace the rear end.,but finacialy and time wise i just cant make it happin i have to be in certain places at certain times the car is always rollin....

i realise your probly gonna wanna correct my spelling to so to save ya some effort im already aware just to tired to care....

to every one else who gave good feedback im thankfull..i relize replacing the rear end would make more sence but concidering my circumstance.,.,im just gonna have to roll it till it wont roll no more..,this car has gotten my girl and i thru alot of hard times now i just need it to make it a couple more months ...then ill be able to fix her up.,,.

B.T.W any have any ballpark figure how much a used rear end should cost??

 

Like duck stated you should be able to grab a JY one for +- 100 bucks.


I also agree with what Lo-Tec is saying...

If your going to half *** the job at least replace the races on the bearing. If its actually the pinion bearing that is hooped then the race will be pitted up from the overheating and chewed up the rollers which caused the bearing to fail in the first place. For the extra couple bucks replace the damn cup.

I also think theirs alot more than the pinion bearing that is contributing the the whining in the rear end.

 

Last January in Kingman, AZ I had the yoke removed to stop a small leak from the pinion seal. We drove the car to Marysville, CA where the front pinion bearing blew out during acceleration. The grinding was loud, we knew it was bad. We had a shipping date and airline tickets to get the car to Long Beach on a boat back to Hawaii in only a few days. No time to fix or chase down a replacement rear -- so the car was drivin 800 miles while the rear disintegrated. It was embarrasedly loud, but keeping the speed under 55 and easy-on-the-gas, got the Z28 on the boat. We wasted $1,000 trying to it fixed, gave up and finally installed a salvage yard rear [4th gen with PBR brakes bought for $125].

Changing your front seal won't stop the grinding. Drive the car 'till the rear dies, have it towed home, then replace the whole thing cheap.

 

If your here to learn then open your ears. We all give advice from experiance. If you want to beleive in some monkey spank Autozone parts counter problem sovling $30 fix then by all means try it. When your rear end starts whining, the pinion smacks the carrier and starts to break apart I hope for your sake no one get killed.

Good Luck!