71 Nova 10 bolt rear end 8.2 or 8.5? - Chevy Nova Forum
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Old 26th-November-2006, 09:54 PM   #1
57 BelAir

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71 Nova 10 bolt rear end 8.2 or 8.5?

I'm still trying to determine what rear end I have in my Nova. I've taken it down and found it has a 30 spline pinion and the square notches on the carrier as indicated in Nova Resources site for an 8.5 carrier. I'll try to insert a few pics I've taken. Also, the ring gear maesures 8.5 inches. I guess this is an 8.5 rear but, the ring and pinion indicates 71 as the year. I'm just not sure?

I guess I can't post images? Thanks Mac
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Old 26th-November-2006, 11:25 PM   #2
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All the 71's I've come across had 8.2's...but withouth knowing the full history of the car, it could easily be an 8.5" (it's not like they're rare).
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Old 26th-November-2006, 11:32 PM   #3
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try this:

http://www.novaresource.org/axle.htm

it should help you out.

Eric
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Old 27th-November-2006, 08:44 AM   #4
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If it has 30 spline axles, it's not original. All of the 1971's (AFAIK) got the 28 spline 8.2" rear axle.

What is the date code on the passenger side tube?
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Old 27th-November-2006, 09:48 AM   #5
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1971 Nova rear end code

The passengers side axle tube has these letters and numbers: JD G340 2.

Tha axles are 28 spline, the pinion is 30 spline. The Nova Resource differential page shows a carrier housing with 2 pronounced square lugs or blocks on the bottom indicating it's an 8.5 rear, my carrier has these lugs. The open carrier has a GM6 and 495N opposite the ring gear mounting flange. There is also an L 2 1 on the carrier housing which if I'm right, mean the housing was manufactured December 2nd 1971. The numbers on the ring gear are: 2 GM 3984828 13 40 71 2 the pinion numbers are: 71 3984829 13 40 GM
Thanks for the help guy's
Mac
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Old 27th-November-2006, 10:36 AM   #6
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The 13 and 40 indicates a 3.08 ring and pinion ratio. I think those 71 numbers on the gears are date codes. The "340" is the housing date code which is December 6. You may have one of the last 1971's made and GM used a new for 1972 "JB" 2.73 ratio 8.5" ten bolt rear axle with 3.08 gears. Who knows? Stranger things have happened at GM.

What engine/trans combo did the car have from GM?
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Old 27th-November-2006, 10:56 AM   #7
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http://i21.photobucket.com/albums/b2...10BOLTID-1.jpg
check this one out
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Old 27th-November-2006, 12:05 PM   #8
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[QUOTE=57 BelAir;400380]The passengers side axle tube has these letters and numbers: JD G340 2.

That looks very simular to mine. Its a 71 with a JD G096 2 code and 90 degree tabs. Everyone says 71's usally did not come with 8.5 but I'm sure mine is (have not had it apart yet)

Later
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Old 27th-November-2006, 12:05 PM   #9
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http://i21.photobucket.com/albums/b2...10BOLTID-1.jpg

You have to copy the link off the actual page. It gets shortened on here when copied and pasted.

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