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Old 03-01-2008, 09:45 AM
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1970 Nova

Its in great shape looking for a posi rear ead what would be a good place or car to find one that will fit. If I HAVE to I will buy a new one but hey why not save money and get a rear end that already has one in it. Thanks for the help!

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Old 03-01-2008, 12:42 PM
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upgrade your 10 bolt to the newer 30 spline center & axles. you could get a 30 spline 10 bolt posi used out of a impala ss or out of a pickup 10 bolt rear. then buy aftermarket axles or re spline some 30 spline axles out of a newer vehicle. as a example look on ebay for 10 bolt posi.
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Old 03-02-2008, 12:13 PM
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Or, if you would like, any 1st generation Camaro ('67-'69) would also fit. Since your looking, check under the SS cars-came 12 bolt equipped. The posi ones will have a red plastic tag on the cover to "use Positraction fluid only."
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Old 03-02-2008, 05:05 PM
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You would be better off trying to find a Ford 9" rather than a 12 bolt. The 12 bolts to fit your Nova are high dollar, anywhere from $1000 to $1500 is not uncommon. They are fairly rare as people building clones have snapped them up. Ford 9" rears are all over the place and pretty strong with parts available everywhere.

Vince

Last edited by 302 Z28; 03-02-2008 at 05:49 PM.
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Old 03-02-2008, 07:04 PM
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An 8.5" rear from a '72-'79 Nova would fit if you shorten your driveshaft a little, or use the one from the donor car if it's available. You probably have monoleaf springs, and '72 SS cars and all '73-up have multileaf. Again, you can rob springs and mounting parts from the donor car and use them on yours. Most of those will not have posi, and most will be highway geared, but there are a boatload more 8.5" posi units running around on the used market than there are 8.25" like you probably have.

That said, what you need to do really depends on what you want to do with the car. Full race, the 9" would be a good idea. If you're just gonna cruise it, stick a posi in the 8.25" and you should be OK.

Get the U-bolts from the later car and replace the T-bolts that mount the leaf springs to the axle. With T-bolts, the perches can break off and drop that corner of the car to the ground. And get the perches fully welded to the axle tubes, and the axle tubes welded to the center section.
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Old 03-08-2008, 07:23 AM
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1970 nova

thank you very much for the info it has helped alot I would like a ford 9 at the rear plan to spend a few on the motor.My question now would be where to look for a 9 what kind of trucks, cars maybe I doubt it but you never know. I figure u pull yards are the best but not sure what to look under thank you for the help!
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Old 03-08-2008, 08:28 AM
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A 9" can be found in a lot of vehicles. The trucks, vans and the big cars mostly had 9". Just look for a removable front carrier instead of the rear cover that you normally see. The 8" looks just like the 9" but the big difference is if you can get a socket on the bolt below the pinion its an 8".
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Old 03-08-2008, 10:11 AM
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Quote:
Originally Posted by fireman147
My question now would be where to look for a 9 what kind of trucks, cars maybe I doubt it but you never know.
A 1970 Nova rear end measures 60 inches wide, measured this way.



Most Ford truck rear ends are wider than 60 inches. They also have the larger Ford truck wheel pattern ( 5 on 5.5 ). The perfect rear end and almost a bolt in is the 57 to 59 Ford car rear end. It measures 58 inches wide. It has the popular 5 on 4.5 wheel pattern. I installed a 57 Ford rear end under my 69 Nova SS many years ago. But admittedly, the 57 to 59 rears are getting a little more difficult to find than when I did mine ( 1970 ).

Mustangs and other Fords also have the 9 inch series rear ends in the 58 to 60 inch range. Look here for a online list of possible donor vehicles.

http://www.mustangsandmore.com/ubb/F...imensions.html
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