Do you all think autozone bearings are undersized?

AutoZone Bearing
I'm working on a 72 Dart with 7.25 rear with 10" brakes, got a new bearing off ebay that said for 72 dart with 10" brakes & 7.25 rear, But it was too big in center, part # of it was skf rwc35-yyr

So now I'm thinking of just going with the autozone one, but someone put on it that its undersized, what do you all think?

I would not think it would be undersized unless it stated so. The size should be listed. Measure the old one and then compare measurements. BTW, maybe sometime if the life of the dart the brakes were upgraded to 10 inch.

don't have old one to go by, replacing a new bearing from rockauto that seems like it was pressed on too far, but would like to go with a deff. brand this time!

But the guy that posted that they wear undersized on autozone was a ford guy, may just been him! lol

Pulled out a big bolt axel I have in a junk rear from a 74 scamp, bearing was biger like one I have new, guy on ebay sould of posted 73 & up!.. see if I can get a refund on it, if not you'll see the new bearing I have for sale on hear prob.!

72 mopar axle bearing part number is 3420090 It`s not listing a difference for 9 or 10 inch brakes.

This horsepoop has got to stop. There is no such thing as an Autozone bearing!!!!!

For there to be one, Az would have to have a bearing factory and the plain and simple fact is, Autozone makes nothing. Period. They even have their sale flyers printed by a contractor. And this is exactly the same as O'Reilly's, Advance Auto, CARQUEST, NAPA, even Harbor Freight.

All these companies give their brand names to items that are made by others. That's how life works. Shoot, even back in the day, GM didn't make many of their frames, they were made by Budd. And Chrysler used Budd, too This is just one example.

And another thing - bearings are made to international standards. You, the designer, look in the bearing catalog and find what will work acceptably and then you make the part fit the bearing. Talking about rolling element bearings. It's been this way for at least 80 years.

Seals are the same. Many of the smaller parts you find on your car are made by a specialty company and picked out by the designer. O-rings are another, with standardized sizes across the globe (well, maybe not in France).

So if the bearing that someone bought from Autozone doesn't fit properly, either it was made with no quality control or else the shaft or bore it pushes against was made the wrong size. Or else the person trying to assemble it doesn't know how it is supposed to fit.

R.

He's been told repeatedly what's up, but he wants to hear what he wants to hear.

Hey dummy, everbody knows Duralast is autozone brand, I just like to call it autozone!

Yell, dogdays must think people don't know nothing!

Well thats not what I was asking about, but ok!..So that's just the way most other auto parts douse, all 72 & down you got to get the bearing for 9"?... Witch I was thinking same thing when I looked at bearing on the big bolt axle & saw it was the same as the new one I got that was bigger!

Just letting you know what the correct mopar bearing was for the car since you seem to be questioning the aftermarket one. Their listings I`m sure are for multiple years and the mopar catalog is just for 72 vehicles and only one part number is listed for a 72 Dart with a 7 1/4 rear. I know on the NAPA website you can enter the mopar part number and it will cross reference to the aftermarket part number.

Yeal, on the new bearing I got off ebay, I first looked up the Napa one, 10" was high, so took the part number & went to ebay, guy had on their listed for my car, the little bit bigger bearing should be listed for 73 & up!.. That's prob. why autozone don't have 9" or 10" listed on theirs!

So nobody has tried autozone brand for 7 1/4?

Cant you just take the number off your old bearing and get that.

What he said and as you should know there is only one 7.25 bearing regardless of year and brake size.

I think I know that all ready, not what I was asking, I was ask about the bearings at autozone in the link, stick to the subject!... I all ready know, Their is only one for 72 & down, 73 & up is the bigger one!

I think I know that, I do have The numbers from my old one & it did not brag up the bearing on any auto parts, but did find some NOS ones on ebay, but that don't matter now, if you read the other post, all I need to know is has anybody ever had a prob. with the bearing from autozone like the ford guy wrote, I'm fixing to go order one, but it would of been good to know nobody has had any prob. with their brand of bearing!

I used AZ bearings on my 7-1/4 in my old Duster a few times. Order the right year and they work fine.

I would surely would rather use a NOS mopar bearing before using a Duralast bearing. Probably made in China.
Did you get the info for the undersize bearing from the autozone website? This is the review that was left. It apparently was for a Ford Mustang.



"This bearing does not fit Mustang 8" or small bearing 9"

Beware. This bearing is undersized by a whole bunch. If you try to press it on your axle without checking to see if it fits first, it will fly apart and possibly injure you. Maybe the ones I got were in the wrong box or mismarked or something, but they were in their sealed package.

The bearing should be a 0.002" to 0.003" press fit. There is no way it will go on the axle without breaking.

Pros: It is shiny when you take it out of the box

Cons: The ID of the bearing is almost 0.030" (THIRTY THOUSANDTHS!!!) undersized"

Duralast may be an Autozone brand, but they are still made by somebody else. Perhaps your bearing was mislabeled. I have sold auto parts for many years and have seen stranger things happen. With a vehicle that is 45+ years old, you never know what changes have been done to it.

thirty thou smaller is definitely not going to work. even an identical size of "x" [where id. and od. are the same] is a press fit, but not much of one. on the bearing in question, was it exchanged for another and the exchange measured ? in my 55+years of playing with this junk [instead of the smart thing, being playing with tiddlywinks] i have seen all kinds of mismarked, misboxed, misprinted parts catalogs and computer programs that anything is possible when it comes to ordering parts. with out comparing the parts you need with others, a blanket statement about sizing can not be accurately made. as has been said, bearings and seals are made by someone other than the retailer, and those parts are made to a universal sizing standard. you can even go to an industrial bearing place and get the bearing and seal you need, providing you have the [correct] numbers, as those places rely on the standardization of numbers being od., id., and thickness, as well as being a sealed or non sealed bearing, instead of the application, be it industrial, automotive, or other use.

Rock Auto shows the bearings for $7-18. Order one and be done.

Just my two cents, but for my vehicles I will only use Timken bearings.

Open the box and check before you buy it. The last Timken I bought turned out to be a generic bearing in a Timken box. There was no writing what so ever on the bearing. Could have been from anywhere. Would have been somewhat cheaper to just buy the junk chinese bearing instead of the same junk masquerading as a Timken.

Got one today from autozone that I had in the link & it was oversized, put it down on axel & its got room to move, loose on it, so I got to take it back, So I'm going to go with advance so I can get it next day!

https://shop.advanceautoparts.com/p/nati...rear#fragment-3

Done that once, Had a shop press it on & my rim was getting too hot even with brakes backed all the way off, after pulling axel out, the retainer ring looks a little side ways too me & I ask a guy at another shop in town, it looked a little sideways to him too, So I'm getting new one to go on again at a deff. shop, so I'll go with another brand at advance auto so I can get it next day!.. If the lowers priced NOS ones on e-bay had the retainer rig I may would of went with one of them!

All the Timkens I have used have Timken marked right on the bearing. If I run across one that doesn't it will not be used.