Difference between 8.2 and 8.5 differential - Team Camaro Tech
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post #1 of 18 (permalink) Old Oct 30th, 06, 12:48 PM Thread Starter
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Difference between 8.2 and 8.5 differential

How can I tell which is which,I've done a search and noting that says what to look for.Any help would be great.Thanks guys...
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post #2 of 18 (permalink) Old Oct 30th, 06, 01:18 PM
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Re: Difference between 8.2 and 8.5 differential

Check out the link below. There's a ton of differential information.
They're pretty easy to tell apart, the 8.5 rear has the square lugs that are visible on the bottom corners of the pumpkin where the 8.2 has none. The 8.2 would be a factory 1st Gen 10 bolt and the 8.5 would have most likely come from a Nova.


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

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post #3 of 18 (permalink) Old Oct 30th, 06, 03:13 PM Thread Starter
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Re: Difference between 8.2 and 8.5 differential

Thanks, that's just what I was looking for.
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post #4 of 18 (permalink) Old Oct 30th, 06, 05:08 PM
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Re: Difference between 8.2 and 8.5 differential

Cool. Always assumed I had the 8.2" 10 bolt in my 68 Camaro but just checked using the identification info in the link and I have the 8.5"

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post #5 of 18 (permalink) Old Oct 31st, 06, 07:50 AM
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Re: Difference between 8.2 and 8.5 differential

8.5's from some Novas can be made to fit right under a 1st gen, that's most likely where yours came from ... the 8.5's are considered stronger than the 8.2's ... also there seem to be more gear choices availible for the 8.5 as they were install in vehicles up through 2000 or so.

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post #6 of 18 (permalink) Old Oct 31st, 06, 09:17 AM
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Re: Difference between 8.2 and 8.5 differential

72-75 Nova 8.5 rearends are direct bolt in for 67-89 Camaros. I've heard that the driveline may need to be shortened though.

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post #7 of 18 (permalink) Old Oct 31st, 06, 09:28 AM
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Re: Difference between 8.2 and 8.5 differential

Here's a pic of an 8.5, 3:73 posi under my 69 Camaro. Direct bolt in. Great diff and alot less than a 12 bolt.



Here's a pic of a 8.2. The diff cover is an easy way to tell the difference too.


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Last edited by madmax87; Oct 31st, 06 at 09:40 AM.
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post #8 of 18 (permalink) Old Nov 1st, 06, 02:10 PM
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Re: Difference between 8.2 and 8.5 differential

Please do not go by diff covers ...Those are interchangable they will bolt on to either housing. The casting is the only true way to tell. Look at the first picture 7 and 5 o'clock bolts. See the 8.5 casting triangles...That is on all 8.5 rear even up till now 2000 etc. May look abit different but will all have extra casting flashing that hangs out like that. Also if you look at the casting collar where both axles are press into the center section will have (4) equally spaced bumps too All of them 1973 1980 GN 1996 Impala and all the 10 bolt 8.5 trucks will have these casting similiars. The Yokes will all have 4 bolts and 2 straps system to hold in the u-joint. If it has u bolt to hold the u -joint in it is NOT a 8.5 for sure. ope this extra info helps. Jim J D RACE.COM

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post #9 of 18 (permalink) Old Nov 1st, 06, 02:20 PM
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Re: Difference between 8.2 and 8.5 differential

zzzzz are the yokes interchangeable? I just got a rear end and found the driveshaft is now about 1/2" too long. I determined I got an 8.5 rear end by the yoke, and the triangles. What I thought was a good deal turns out to be a great deal. I can always have the driveshaft shortened but I was just curious. Scott

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post #10 of 18 (permalink) Old Nov 1st, 06, 03:51 PM
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Re: Difference between 8.2 and 8.5 differential

3"

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post #11 of 18 (permalink) Old Nov 1st, 06, 05:50 PM
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Re: Difference between 8.2 and 8.5 differential

The 8.2 yoke will not fit the 8.5. The 8.2 has a 25 spline pinion and the 8.5 has a 30 spline pinion. If you get a yoke from a '71 to '75 8.5 rear end it will have the 1310 u joint and your drive shaft should work without modifications.
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post #12 of 18 (permalink) Old Nov 3rd, 06, 02:38 PM
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Re: Difference between 8.2 and 8.5 differential

Here is a picture of a mult leaf 10 bolt from a 69 Camaro that I thought is a 8.5 but it has the u bolts to hold the u -joint. It has the larger size bolt heads to hold ring gear and looks like it has triangles. gear ratio is about 3.55
Is this a 8.5?
thanks

Last edited by JOE58; Jul 11th, 09 at 07:00 PM.
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post #13 of 18 (permalink) Old Nov 3rd, 06, 05:26 PM
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Re: Difference between 8.2 and 8.5 differential

Can't tell from this angle. Can you post a picture from the other side? If it has 3/4 inch heads on the ring gear bolts and a 1 1/4 inch pinion nut then it should be the 8.5.
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post #14 of 18 (permalink) Old Nov 4th, 06, 03:01 PM
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Re: Difference between 8.2 and 8.5 differential

thanks for the reply big GH
here is another picture. I think its a 8.5 but it has the u bolt on u joint not the strap/bolts on u joint.

Last edited by JOE58; Jul 11th, 09 at 07:00 PM.
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post #15 of 18 (permalink) Old Nov 4th, 06, 04:47 PM
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Re: Difference between 8.2 and 8.5 differential

That's a BOP 8.2 10 bolt. It has no c clips and is a little stronger than the Chevy 8.2, but it isn't an 8.5.
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