gip63
Forum Regular
Posts: 257
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Post by gip63 on Feb 14, 2018 22:57:42 GMT -5
  Can anyone identify this rear end? I have looked all over the net and the only one I see that looks like this is a GM 10 bolt. It’s in my 73 charger and I was thinking of draining the old oil out and replacing it. I was going to replace old oil so I need to know what gasket to get. I did look at old post but I’m not able to access some of the photos. Just out of curiosity how long can that rear end oil last? |
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Post by Nacho-RT74 on Feb 15, 2018 6:57:35 GMT -5
To me, 8 1/4" The deal is on this diagram they show it more oval than really is  |
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rdc
New Member
Posts: 6 
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Post by rdc on Feb 15, 2018 15:35:17 GMT -5
It looks like a 8.25 to me as well. Is the rear leaking at all? My rule on my old cars is if they are sealed they are good, any leak and that means dirt will get in and it needs to be changed. I don't drive my cars very much, if you put a lot of miles on per year and it hasn't been changed in a long time then it might be a good idea to do so
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gip63
Forum Regular
Posts: 257
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Post by gip63 on Feb 15, 2018 19:30:10 GMT -5
It does not leak but as far as I know it has factory oil in it. If so that oil is 45 years old and I’m thinking it should be changed. I’m open for opinions. The car has 50k miles on it if that matters.
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rdc
New Member
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Post by rdc on Feb 16, 2018 12:58:31 GMT -5
It needs to be changed for sure. Since your draining it nows the time to re-seal it too. When I changed the oil in my 9.25 a few years ago I did the pinion and axle seals as well then I know it would be good for a long time |
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setauketjeff
Settling In
1971 440 MGM Every stoplight is a staging light!
Posts: 230
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Post by setauketjeff on Feb 16, 2018 15:47:54 GMT -5
Is it a limited slip / posi / or even a locker ....etc.? Then you may need to add a manufacturer specified additive too. As I understand (correct me if anyone knows better) You can jack the rear up and spin one side to determine if it's a posi / limited slip. Turn one wheel forward, if the other one goes forward = limited slip/posi. A locker is harder to tell, but they are found mostly on 4 x 4. They will "lock up" when one wheel is spinning faster than the other (I.E. on sand, ice, mud). The rear locks and both wheels get equal power forward (like a posi/limited slip) Fast cornering on dry pavement will screw all of these up.
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gip63
Forum Regular
Posts: 257
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Post by gip63 on Feb 16, 2018 21:22:19 GMT -5
As far as I know it’s limited slip.
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setauketjeff
Settling In
1971 440 MGM Every stoplight is a staging light!
Posts: 230
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Post by setauketjeff on Feb 16, 2018 21:32:56 GMT -5
GM has limited slip additives that need to be added. It's a little bottle and expensive. You can find them on eBay. You will need to figure out the age of the rear and guess it's origin as that will determine which bottle you need to get. Are their any numbers on the rear you can use? Then you can try to figure out the proper ACDelco part number for the additive and then search on that. Good luck.
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setauketjeff
Settling In
1971 440 MGM Every stoplight is a staging light!
Posts: 230
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Post by setauketjeff on Feb 16, 2018 21:34:30 GMT -5
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Post by Nacho-RT74 on Feb 17, 2018 14:31:39 GMT -5
any limited slip ( SUREGRIP ON MOPAR SLANG ) aditive is AS FAR I KNOW the same, is just matter of the brand label.
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