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Do all 8 3/4 rear ends have an inner seal. #901933 01/11/11 10:28 AM 01/11/11 10:28 AM
Joined: Jul 2007 Posts: 99 Michgian M moparfun340 OP member
moparfun340 OP member M Joined: Jul 2007 Posts: 99 Michgian	I have a 1968 RR and the axle is leaking on my tire and it got the brakes all wet. I know there is an outer seal but I can not see an inner seal. I took out he axle and looked down the tube and I can not see an inner seal. Do I have to take out the center section to see the seal. Please let me know what I should d. thanks

Re: Do all 8 3/4 rear ends have an inner seal. [Re: moparfun340] #901934 01/11/11 11:19 AM 01/11/11 11:19 AM
Joined: Apr 2007 Posts: 2,918 Calgary, Alberta Canada a12rag master
a12rag master Joined: Apr 2007 Posts: 2,918 Calgary, Alberta Canada	If I recall correctly, yes there is an "inner" seal that keeps the rear end fluid from contaminating the tapered roller bearings (axle bearings), and there is another seal on the other side of the roller bearing (think this is the one that needs to be pressed on with the bearing ??) . . . the inner bearing you would need a bearing puller to take out . . . the inner bearing is usually located just inside of the axle bearing, you should be able to see it . . . . . Best bet is to check with any service manual . . . Just my Cheers Mark

Re: Do all 8 3/4 rear ends have an inner seal. [Re: a12rag] #901935 01/11/11 11:25 AM 01/11/11 11:25 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Quote: If I recall correctly, yes there is an "inner" seal that keeps the rear end fluid from contaminating the tapered roller bearings (axle bearings), and there is another seal on the other side of the roller bearing (think this is the one that needs to be pressed on with the bearing ??) . . . the inner bearing you would need a bearing puller to take out . . . the inner bearing is usually located just inside of the axle bearing, you should be able to see it . . . . . Best bet is to check with any service manual . . . Just my Cheers Mark You don't need a puller to get the seal out. You can use the end of the axle to pop it out. Then you need to install the new seal. A few was to do it 1 a seal instal tool. a large pipe or socket matching the size of the seal. Good luck

Re: Do all 8 3/4 rear ends have an inner seal. [Re: moparfun340] #901936 01/11/11 11:27 AM 01/11/11 11:27 AM
Joined: May 2004 Posts: 679 N.E Indiana R repad super street
repad super street R Joined: May 2004 Posts: 679 N.E Indiana	Possibly, your inner seal is worn down to the point that the seal lip itself is not visible but the seal flange remains. You can remove the old seal by using the axle itself as a puller, tip the axle on the way out until it catches the back of the seal. Intall the new ones with a piece of pvc.

Re: Do all 8 3/4 rear ends have an inner seal. [Re: moparfun340] #901937 01/11/11 11:29 AM 01/11/11 11:29 AM
Joined: Jan 2003 Posts: 8,940 Holly/MI D Dean_Kuzluzski master
Dean_Kuzluzski master D Joined: Jan 2003 Posts: 8,940 Holly/MI	To me, by design, the inner seal retains the gear oil for the rear differential. The outer seal is more of a dust seal for the greased axle bearings. If the brakes are contaminated with gear oil the inner seal failed. All 8&3/4 style rear axles have the same type of seals at the axle ends. R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04

Re: Do all 8 3/4 rear ends have an inner seal. [Re: Dean_Kuzluzski] #901938 01/11/11 12:10 PM 01/11/11 12:10 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	pack the back side of the seal with bearing greese to help hold the spring on the seal in place when driving it in drive it in to the shoulder stop for the seal wash and repack the wheel bearing,it does not get lubed by the gear oil in the diff the inner seal is right behind the wheel bearing and lock collor on the axle the outer seal is the thin embossed metal shim seal behind the backing plate the foam seal goes behind the bearing retainer and is to keep dirt out of the wheel bearing there are no seals inside by the chunk,but it has a gasket for the housing be sure to set the axle end play adjustment when it goes back together...the adjuster is on the pass side unless some one has moved it to driver side if you replace the stock tapper bearing,it has to be pressed/cut off and pressed on,be sure to not mess up the adjuster,they do not make those any more might as well crack the chunk loose and change the gear oil while its has axle out make sure to replace/clean gear oil off the brake shoes and drum with brake clean( I would replace the shoes if they are oil soaked myself) I run the non-adjustable green bearings with the o-ring on them and did not use the inner axle seals this time,no leaks so far greens can run with or with out the inner seals good luck

Re: Do all 8 3/4 rear ends have an inner seal. [Re: scratchnfotraction] #901939 01/11/11 01:18 PM 01/11/11 01:18 PM
Joined: Sep 2004 Posts: 1,226 Cookeville Chilort Will Work For Mopars
Chilort Will Work For Mopars Joined: Sep 2004 Posts: 1,226 Cookeville	Quote: the outer seal is the thin embossed metal shim seal behind the backing plate the foam seal goes behind the bearing retainer and is to keep dirt out of the wheel bearing Do you have part numbers for these?

Re: Do all 8 3/4 rear ends have an inner seal. [Re: Chilort] #901940 01/11/11 01:25 PM 01/11/11 01:25 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Quote: Quote: the outer seal is the thin embossed metal shim seal behind the backing plate the foam seal goes behind the bearing retainer and is to keep dirt out of the wheel bearing Do you have part numbers for these? I don't have the numbers but don't worry about the outer seal that is in the retainer.It is more of a dust seal than a grease sea and is only replaced when the bearing is replaced as it requires the bearing being removed to replace it. The inner seal is the important one as it keeps the rear end lube out of the bearing which is lubricated by packing with a needle and good wheel bearing grease. Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

Re: Do all 8 3/4 rear ends have an inner seal. [Re: Chilort] #901941 01/11/11 01:51 PM 01/11/11 01:51 PM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	The inner seal usually fails due to worn or badly adjusted wheelbearings (too loose). BigBlockMopar.com

Re: Do all 8 3/4 rear ends have an inner seal. [Re: moparfun340] #901942 01/11/11 07:59 PM 01/11/11 07:59 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You'd see it right there in the recessed step(s) at the end of the housing if it was there. Strangely a PO my have omitted it for some reason. Get a made in US of A one and as Scratchn said pack the back side of it w grease to keep the delicate spring in place as you drive it in. Determine how deep it goes (to which step) (eyeball the axle bearing to help determine that distance) & put some gasket cement sparingly but evenly around the ID of that step cause if you put it on the seal OD itself alot will be rubbed off as the seal is driven down to its location. Get a round flat piece of metal (SLIGHTLY less OD than the seal OD) and a drift and a BFH and a HELPER to hold the circular metal and the seal in there and the drift centered on the circular metal & you man the hammer . But b 4 you even get started 1st trial fit the seal by hand at the OPENING of the final location/step as some are a bit too wide (OD) & taking the paint off helps (then clean it) keep from mangling it (some cheap ones tend to be like that). Get it started evenly/lightly/firmly into the housing w a few easy taps then drive it down to it's distance with as few whacks as possible (each stroke makes it more likely to distort). If the seal starts to go a bit sideways move the drift to the portruding side & even it up. Trust me a helper works wonders (3 hands are needed). Wrap the splined end of the axle w a piece of brown paper sack paper & stick the axle thru the seal until the splines are on the inside then pull the paper out & already have put some grease on the seal ID if the axle shaft is dry. I prefer the end play on the low side .008-010" or less. I'm w Eberg- tapered roller bearings LIKE preload live every 24 hour block of time like it's your last day on earth

Re: Do all 8 3/4 rear ends have an inner seal. [Re: MoparforLife] #901943 01/12/11 08:18 AM 01/12/11 08:18 AM
Joined: Jan 2003 Posts: 21,072 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,072 Niles , Ohio	The best and cheapest seal installer Ive see is a piece of plastic pipe.Get a piece that almost as big as the seal and about a foot long.Line up the seal and tap in.Goes in straight and dosent deform the seal.Probally costs about a buck or two.Rocky Chrysler Firepower

Re: Do all 8 3/4 rear ends have an inner seal. [Re: therocks] #901944 01/12/11 10:24 AM 01/12/11 10:24 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	mine does not have the inner seals this go round with the green bearings so dont have a few before or during the install,i wasted 12$ with the BFH this go round they are a must with stock tapperd bearings but can be run with or without with greens

Re: Do all 8 3/4 rear ends have an inner seal. [Re: MoparforLife] #901945 01/12/11 12:09 PM 01/12/11 12:09 PM
Joined: Sep 2004 Posts: 1,226 Cookeville Chilort Will Work For Mopars
Chilort Will Work For Mopars Joined: Sep 2004 Posts: 1,226 Cookeville	Quote: Quote: Quote: the outer seal is the thin embossed metal shim seal behind the backing plate the foam seal goes behind the bearing retainer and is to keep dirt out of the wheel bearing Do you have part numbers for these? I don't have the numbers but don't worry about the outer seal that is in the retainer.It is more of a dust seal than a grease sea and is only replaced when the bearing is replaced as it requires the bearing being removed to replace it. The inner seal is the important one as it keeps the rear end lube out of the bearing which is lubricated by packing with a needle and good wheel bearing grease. I was looking for PNs specifically for the two parts I quoted. When I put inner seals in my last 8 3/4 I wanted a set of the two parts listed there and the local stores looked at me like I had two heads. I guess I could do a little more digging on my own.

Re: Do all 8 3/4 rear ends have an inner seal. [Re: Chilort] #901946 01/12/11 05:01 PM 01/12/11 05:01 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	I have them wrote down some where,i am looking for them now...

Re: Do all 8 3/4 rear ends have an inner seal. [Re: scratchnfotraction] #901947 01/12/11 05:13 PM 01/12/11 05:13 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	here you go mopar metal gasket #2881314 foam gasket #2070933 adjuster and seal kit- national oil seals 8704-s 8695 left-A7-LK right-A7-RK

Re: Do all 8 3/4 rear ends have an inner seal. [Re: scratchnfotraction] #901948 01/12/11 05:17 PM 01/12/11 05:17 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Michael is the A7-LK the threaded adjuster plate/seal assy? How much does it run? EDIT meant the A7-RK as it goes on the pass side. Last edited by RapidRobert; 01/12/11 05:19 PM. live every 24 hour block of time like it's your last day on earth

Re: Do all 8 3/4 rear ends have an inner seal. [Re: RapidRobert] #901949 01/12/11 05:22 PM 01/12/11 05:22 PM
Joined: Jan 2003 Posts: 75,005 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,005 U.S.S.A.	Quote: Michael is the A7-LK the threaded adjuster plate/seal assy? How much does it run? EDIT meant the A7-RK as it goes on the pass side. I don't think you can buy the endplates anymore unless the aftermarket started making them again in the last year or 2 , you need to find good used ones or old MP kits to get them now .

Re: Do all 8 3/4 rear ends have an inner seal. [Re: scratchnfotraction] #901950 01/12/11 05:24 PM 01/12/11 05:24 PM
Joined: Sep 2004 Posts: 1,226 Cookeville Chilort Will Work For Mopars
Chilort Will Work For Mopars Joined: Sep 2004 Posts: 1,226 Cookeville	Quote: here you go mopar metal gasket #2881314 foam gasket #2070933 I wonder if Mopar still has them. They've not been able to get much for me lately.

Re: Do all 8 3/4 rear ends have an inner seal. [Re: JohnRR] #901951 01/12/11 05:29 PM 01/12/11 05:29 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: I don't think you can buy the endplates anymore unless the aftermarket started making them again in the last year or 2 , you need to find good used ones or old MP kits to get them now . Thank you double R. I need a threaded one & there's a pair of used ones (both sides) in the parts for sale sec for $25 to your doorstep, I should jump on em live every 24 hour block of time like it's your last day on earth

Re: Do all 8 3/4 rear ends have an inner seal. [Re: RapidRobert] #901952 01/12/11 05:31 PM 01/12/11 05:31 PM
Joined: Jan 2003 Posts: 75,005 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,005 U.S.S.A.	Quote: Quote: I don't think you can buy the endplates anymore unless the aftermarket started making them again in the last year or 2 , you need to find good used ones or old MP kits to get them now . Thank you double R. I need a threaded one & there's a pair of used ones (both sides) in the parts for sale sec for $25 to your doorstep, I should jump on em Yes you should , that's a good price if they are not all bent up , but as long as the threaded adjuster is free you can straighten the rest .

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