When I swapped out the third member in my R/T, I loosened the axles to be able to change it. Now the bearing on the right side is making a rhythmical grinding noise. An they be re-lubed or should I just replace it? I read on how to replace it in the service manual and I don't have a lot of the special tools, so can it be done without them?
Thanks!
Yes they can and should be re-greased from time to time. The diff oil doesn't lube the axle bearings. The rhythmical noise you are getting may be from incorrectly setting of the axle end play.
If you have never greased your axle bearings, you should IMO.
:iagree: Grease your bearings and set your axle end play with the adjuster. You only adjust the end play on one side that's why there is only one adjuster. There is a exact amount of play that the factory calls for. I have done so many that I do it by feel. About a 1/8 inch of in and out movement will work fine. Do all this and you will probably be fine. I don't I have ever seen one of those bearings go bad with any I have worked on. Good Luck!
Thanks. All I did was unbolt it, slide it to clear the third member and put it back. I didn't check the end play other than to see that it wasn't moving any differently than before I loosened it. Would the noise be an indication of too much play?
Yup
when you put the axles back in, you should have the adjuster backed off a bit. Tap the axles with a non-metalic hammer/block of wood, whatever to seat them. Then tighten up the adjuster. Roll over the axle a few turns and check end play. Keep tightening until you have no end play. Then back off the adjustment 4 notches. That should give you the recommended 8 to 16 thou end play. I aim for closer to 8 thou and 3 notches netted me 10 thou on my axle. :alan2cents:
I don't recall even seeing an adjuster. BTW - this is for an 8 3/4 rear.
Passenger side. You will see what look 'sort of' like a crown nut around the axle. It is the threaded adjuster.
Unless you have green bearings instead of original? What I described relates to the set up of original style bearings.
Sweet! Thanks! Looks like I'll be back under the car again tonight! LOL
I adjusted the play on the right side and got it in tolerance. Now the problem I am having is the back of the drum is scraping against the backing plate. Ugh.
Are they the same drums as you were using before? They didn't rub before you adjusted the axles?
Quote from: erik70rt on August 25, 2017, 04:14:01 PM
I adjusted the play on the right side and got it in tolerance. Now the problem I am having is the back of the drum is scraping against the backing plate. Ugh.
Same drums. And they didn't rub before. I only changed the third member.
The original gaskets were shot so I fabricated new ones. Perhaps they are not thick enough causing the axle to sit too close to the backing plate?
More likely the backing plate got a new kink in the edge of it.
:iagree:
Quote from: RUNCHARGER on August 25, 2017, 06:23:07 PM
More likely the backing plate got kink in the edge of it.
:iagree:
I went and asked a buddy of mine who is a mechanic for Dodge. When I told him what I had done, he said I was missing a pin that goes between the axles that help set proper end play. Since I don't have that pin, I need to swap out the bearings to the non adjustable green bearings. Does that sound right?
Yes & No
if you do not have the center pin you cannot set the end play , I would far rather do it properly & add the center pin than go to the cheap Green brgs though
Where can I get a center pin? How do you install it in an 8.75?
There is no pin I'm aware of? Swapped a few rears but never knew anything about a pin?
I would check with Dr. Diff. Someone reproduces them but I can't remember who, Dr. Diff is the go-to guy though. I'm not a fan of green bearings either on a car that goes around corners.
Oh, here's one link.
https://www.yearone.com/Product/1966-74-a-b-e-body/qj64
Is your new 3rd member a clutch style sure grip?
Cause they are the only units that use thrust pins... And if your missing thrust pins you buy thrust pins not new bearings...
Quote from: Chryco Psycho on August 26, 2017, 07:34:44 AM
Yes & No
if you do not have the center pin you cannot set the end play , I would far rather do it properly & add the center pin than go to the cheap Green brgs though
And now I'm removing the tru-trac I just put in because the guy who helped me said I didn't need it....I'll be doing the same job as you tonight Erik :pullinghair:
Quote from: dodj on August 26, 2017, 11:44:14 AM
Quote from: Chryco Psycho on August 26, 2017, 07:34:44 AM
Yes & No
if you do not have the center pin you cannot set the end play , I would far rather do it properly & add the center pin than go to the cheap Green brgs though
And now I'm removing the tru-trac I just put in because the guy who helped me said I didn't need it....I'll be doing the same job as you tonight Erik :pullinghair:
I haven't heard/read good things about truetrac and 8 3/4 ....... Hope yours is trouble free.
Quote from: Brads70 on August 26, 2017, 01:34:21 PM
Quote from: dodj on August 26, 2017, 11:44:14 AM
Quote from: Chryco Psycho on August 26, 2017, 07:34:44 AM
Yes & No
if you do not have the center pin you cannot set the end play , I would far rather do it properly & add the center pin than go to the cheap Green brgs though
And now I'm removing the tru-trac I just put in because the guy who helped me said I didn't need it....I'll be doing the same job as you tonight Erik :pullinghair:
I haven't heard/read good things about truetrac and 8 3/4 ....... Hope yours is trouble free.
Me to. Locally the Mopar guys seem to really like them?
I'll ask the stupid question, What's wrong with the green bearings, I've put them in the last few cars we've restored ever since a rear end shop told me they were an improvement over stock.
They are a sealed round ball bearing design and work fine for going straight. It's been said they don't handle side loads very well. Like road course curves and driving under those types of conditions. It's also been said they have durability issues.
I run them myself but can't confirm or deny any of those things. I don't have enough miles on mine yet.
Quote from: Gary on August 27, 2017, 02:28:44 PM
I'll ask the stupid question, What's wrong with the green bearings, I've put them in the last few cars we've restored ever since a rear end shop told me they were an improvement over stock.
They are definitely not an improvement over stock, they are just cheaper. The 'green' bearings are perfect for something that never see's side loading, like an electric motor driving a pump. But for a car.....well....not designed for the application.
http://www.doctordiff.com/blog/tech-info/why-green-bearings/
http://www.timken.com/products/timken-engineered-bearings/
Some explanation of the differences in the types of bearings and their best uses.
I ordered a set of bearings from Dr. Diff. My R/T is not a daily driver nor is it driven hard in corners, so they should be fine for my application.
I'm running Dr. Diff axles with his green bearings. I do drive mine hard from hole shots to high speeds. :burnout: Not really autocross type driving but I tend to hit the curves pretty aggressive. I guess time will tell.
Quote from: erik70rt on August 28, 2017, 06:30:53 AM
I ordered a set of bearings from Dr. Diff. My R/T is not a daily driver nor is it driven hard in corners, so they should be fine for my application.
Just curious. I replaced the center pin in 30 minutes. What made you decide to go the new bearing route instead of just replacing the missing piece?
Fair amount of labor involved in cutting off the old collar etc..
Quote from: dodj on August 29, 2017, 05:27:26 PM
Quote from: erik70rt on August 28, 2017, 06:30:53 AM
I ordered a set of bearings from Dr. Diff. My R/T is not a daily driver nor is it driven hard in corners, so they should be fine for my application.
Just curious. I replaced the center pin in 30 minutes. What made you decide to go the new bearing route instead of just replacing the missing piece?
Fair amount of labor involved in cutting off the old collar etc..
I don't remember if I have the clutch type of third member and I didn't want to pull it all apart again to find out.
Quote from: erik70rt on August 26, 2017, 05:57:26 AM
I went and asked a buddy of mine who is a mechanic for Dodge. When I told him what I had done, he said I was missing a pin that goes between the axles that help set proper end play. Since I don't have that pin, I need to swap out the bearings to the non adjustable green bearings. Does that sound right?
It sounds like you need the pin not different bearings.
Well, after a bit of thought - I'll stick to my usual line of thinking. If you're going to do it - do it right. So I ordered a pin, gaskets and such and will replace the parts. I'll keep the green bearings in inventory for if I need them down the road for a different project.
Spacer kit finally arrived today. I pulled my service manual and can't find anything about installing it. How does it get installed? Do I need any special tools?
No special tools, look through where one axle lives & you'll see a hole through to the other axle... The thrust pins are inserted from both sides & the small pin is passed through & the second end gets peened to hold the thrust pins...
Everything is installed and working just like it should. Thanks for all the help!
Great news.