8-3/4 rear end selection question
#1078626
09/19/11 09:26 PM
09/19/11 09:26 PM
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Joined: Sep 2011
Posts: 339 California
moparbroz
OP
enthusiast
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OP
enthusiast
Joined: Sep 2011
Posts: 339
California
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I am looking for an 8-3/4 complete rear-end, or a housing with axels,or if I have to all seperate compenents, etc. As I look though I see ads for small bolt pattern, large bolt pattern, Housing with-out axels, third member only 492 case, 481 case, etc. I am confused!
I have a 1972 Staellite Sebring plus that I am putting a 440/727 combo in (I am removing the 318/904/7-1/4 set-up). My question is what exactly should I be looking for? Bolt pattern? width of axels, case #, sure-grip unit #, ring and pinion set up for daily driver, etc. I know A-body rear won't match up but what about C body or? Any direction would be appreciated!
Hebrews 11:1
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Re: 8-3/4 rear end selection question
[Re: moparbroz]
#1078627
09/19/11 09:58 PM
09/19/11 09:58 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Welcome! You'd want an 8&3/4 housing/axles from your body type and non A body 8&3/4's are all BBP and most are the std 10" brakes (some are 11"). check the archives for more info on what bodies use the same axle (width/perch) as yours. Want a 742 case sure grip 3rd member with somewhere from a 3.23/3.55/3.91.
live every 24 hour block of time like it's your last day on earth
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Re: 8-3/4 rear end selection question
[Re: RapidRobert]
#1078629
09/19/11 10:13 PM
09/19/11 10:13 PM
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Joined: Sep 2011
Posts: 339 California
moparbroz
OP
enthusiast
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OP
enthusiast
Joined: Sep 2011
Posts: 339
California
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Thanks for the information gents. I appreciate it! Now I know what to look for. I was on the right track but just wanted to make sure. The sure-grip info is all new to me though and very helpful. So far my experience on moparts is that there are a bunch of very cool, helpful people here!
Hebrews 11:1
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Re: 8-3/4 rear end selection question
[Re: Kern Dog]
#1078630
09/19/11 10:14 PM
09/19/11 10:14 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
The simplest way to go is probably obvious: Find an 8 3/4 axle for your model car. ALL B body axles were what is called the "large" bolt pattern. Only the A body 8 3/4 axles came in the small bolt pattern. As far as I have found, ANY 8 3/4 3rd member can physically fit into ANY 8 3/4 housing. They all use the same 10 bolt pattern. Also, in mid 1969, the '489 case 3rd member was phased in and ran until the axle went out of production at the end of the 1974 model year. The ones that had Sure Grip differentials were the Cone type. Great when new, but when they wear out, they are not easily rebuilt. A clutch type SG can be rebuilt though if you can scrounge one. They are NOT being reproduced, so you'd have to find a used one.
I thought the clutch type sure grip were being repopped. Did they quit. Hope so make my 4 or 5 stash worth that much more.
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Re: 8-3/4 rear end selection question
[Re: savoy64]
#1078633
09/20/11 09:59 PM
09/20/11 09:59 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Dont play with B body axles--there are 3 or 4 different widths of axles to get lost in----when you replace an axle shaft you have to buy custom made----
Yeah... GREAT advice if you have loads of cash laying around. A body housings are easily 3 times the cost of a 62-70 B housing. CUSTOM Axles? Why not REuse the shafts that came in the stock rear end? If they look good and you don't intend to run 400 horsepower on slicks, you'll be fine. Even if you want to upgrade, just order a replacement set in the stock length. You worry too much. I have a 67 B housing in a 67 Dart and I used STOCK 15x7 steel wheels with no interference problems.
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Re: 8-3/4 rear end selection question
[Re: 446acuda]
#1078637
09/21/11 12:25 AM
09/21/11 12:25 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
yukon make power loks for 8-3/4
Arrrrgh. Man make fire. Yukon make power lock.
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Re: 8-3/4 rear end selection question
[Re: Kern Dog]
#1078638
09/21/11 12:27 AM
09/21/11 12:27 AM
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Joined: Jul 2008
Posts: 30,632 Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Quote:
Arrrrgh. Man make fire. Yukon make power lock.
...FRANKENberri must-have LOTS of time on his hands ..
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Re: 8-3/4 rear end selection question
[Re: IcorkSOAK]
#1078640
09/21/11 12:59 AM
09/21/11 12:59 AM
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Joined: Jan 2007
Posts: 389 kansas city, mo
rave_12000
enthusiast
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enthusiast
Joined: Jan 2007
Posts: 389
kansas city, mo
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I am familiar with 3 types of 3rd members listed in order of durability: 741 < 742 < 489. Granted, pre 1970 units had the clutch-style (easily rebuildable) carrier, but all carriers will interchange between any and all cases. Gears are specific to each case. Shape of pinion is where you will find the difference in durability due to tapering and lack thereof. If you are doing a moderate 440 auto build, any case will be fine. new yukon 8 3/4 clutch carrier at: http://www.yukongear.com/Positractions.aspxRear housing selection will depend on how much tire you want to fit under there. Perches can be moved and offset sheackles can be used for clearance. You are looking at about 63" drum to drum on your car, which is one of the widest. perch to perch, you are 47.3", which is the widest of all. The path of least resistance would be to find the original stock 8 3/4 to match your car. The fender wells are quite large to fit some meathooks under there. But, e body 8 3/4 rears are likely less difficult to find and easier on the wallet? You can move the purchases a bit, but you must watch tire/spring clearance. that is where you might consider the the reloc kit or backspace manipulation with wheels. I wouldn't get to carried away with new axles...use stock with any 5 x 4.5 bolt pattern. your wheels will fit fine. I don't think there would be a need for an a body rear...again, the rear fender flare is huge. brakes sizes big and small with stock drums. either will be fine for your application. I believe that the 7 1/4 backing plates should just slide right off and right onto the 8 3/4...viola. most importantly, don't forget to add oil...and a little sure grip additive. mike
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Re: 8-3/4 rear end selection question
[Re: moparbroz]
#1078641
09/21/11 01:20 AM
09/21/11 01:20 AM
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Joined: Dec 2005
Posts: 4,280 State of Fascism
52savoy
master
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master
Joined: Dec 2005
Posts: 4,280
State of Fascism
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Quote:
I am looking for an 8-3/4 complete rear-end, or a housing with axels,or if I have to all seperate compenents, etc. As I look though I see ads for small bolt pattern, large bolt pattern, Housing with-out axels, third member only 492 case, 481 case, etc. I am confused!
I have a 1972 Staellite Sebring plus that I am putting a 440/727 combo in (I am removing the 318/904/7-1/4 set-up). My question is what exactly should I be looking for? Bolt pattern? width of axels, case #, sure-grip unit #, ring and pinion set up for daily driver, etc. I know A-body rear won't match up but what about C body or? Any direction would be appreciated!
You need a housing with axles or a complete unit out of a 1971,72 and maybe a '73 B-body will work. E-bodies will bolt in but are over an inch shorter but you could run bigger wheels then.
A-body 55.6" wide and 43" pad width
B-body sedans 62.0" wide and 47.3" pad width B-body wagons 63.4" wide
E-body 60.7" wide and 47.3" pad width
Last edited by 52savoy; 09/21/11 01:24 AM.
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Re: 8-3/4 rear end selection question
[Re: 52savoy]
#1078642
09/21/11 01:07 PM
09/21/11 01:07 PM
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Joined: Sep 2011
Posts: 339 California
moparbroz
OP
enthusiast
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OP
enthusiast
Joined: Sep 2011
Posts: 339
California
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Scored an 8-3/4 out of a 69 Charger for $225.00. Need a sure-grip unit still and the correct length axels. Stoked that I have the housing though. Going to powder coat. What's the correct finish? It isn't gloss black correct?
Hebrews 11:1
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