Allan R

Look above that and it says "full - 2004". The only way you fill these is by emptying them first, unless that was just his way of verifying the level was good by sticking his pinky into the bung and check for fluid?

As I suggested, the carrier and axles may have been swapped. That's why I asked if the axle shafts had holes to undo the 4 securing bolts.

Do you have any pics that show the inside of the carrier with the pin and spyder gears showing better?

70cutty

Take wide angle picture and post it . Or pull the yoke and count the spline.

Allan R

Problem is the car is all back together right now if I understood from earlier. Pics would have been nice whilst it was apart. Now the next easiest way is to check those axle shafts. C clip types will not have those axle flange holes.

Ces

Yes, mine has the little square bumps like yours.
Four of them


image_zps7879274b.jpg

sammy

out of my 72 cutlass S that is now in my 71 W30...

Ces

I'll ask my guy who opened it and took some pics...

Ces

Sorry I'm having trouble seeing what side of the case I'm lookin at.
Please advise.
And yes, it's all back together now and mechanic has gone home so it's closed for the next few days if not longer.

70cutty

8.5 olds guaranteed. Pull the yoke and count the spline. I learn a lot from Jim just talking to him on the phone.

Ces

Looks like mine.
What is it?
An 8.5 ?

Ces

I'm starting to wonder if OPGI meant to say they've only heard of 8.5's in these cars and NOT 8.2's.

70cutty,
What about my pinion nut length matching the 8.2?
And the c clips we saw inside ?
I thought these were only found in 8.2's.
No one has responded to those questions yet...

My audio guy is finishing a repair right now.
Once he's done, I'll take more pics.

sammy

it is a 8.5 10 bolt o type axle...3.42 gear just by the count method...

70cutty

When jaunty asked if you seen the c clip you said no.

Allan R

That's the bottom of the differential, looking from the front to back. Note the position of the circular cutouts at the bottom.

Ces

I don't remember doing that and never meant to say that.
I did post a couple times that I DO have c clips.

Either way, I have c clips and the pinion nut specs of the 8.2.

Can any one tell us if the 8.5 had c clips?
Can an 8.5 have the shorter pinion nut that I have?

Thx

Ces

Ok I'll get on that tomorrow.
Very long day.
Thanks again.

70cutty

Pull the yoke and count the spline 8.5 30 spline, 8.2 27 spline.

Ces

Ok. But do you mean 28 spline? I haven't seen anything about a 27!

70cutty

Have you seen the c clips or are you just going by what the guy said?

70cutty

I was talking about the yoke, not the axles. Earlier I was looking at the pictures on the computer, just wandering how did you confirm that this is 8.2??
Sorry I am posting this from my phone from Philippines, not the greatest connection.

Ces

I see here in the new Summit catalog,
the 8.5 has c clips. And comes with 28 or 30 spline.
image_zps49b52aec.jpg
My confusion continues....
I'll Just have my mechanic pull the wheel and count the teeth.
Then I going to find the casting number Allan showed me.
Then I'm likely going to contact Jim.

Thanks again, CO.

Ces

My extremely competent Mechanic identified that my rear end does have c clips. No I did not see them. But it's irrelevant now as I see both the 8.2 and 8 .5 can have c clips

Ces

Sorry I do not understand this question if this is a continuation of something you posted earlier please put it altogether at once for me:
because it's like the more we discuss this the more confused I'm getting.
The more people I talk to the more opinions vary or straight up contradict one another....

I ended up having to give my mechanic $280 yesterday and I still don't know what rear end is in my car

70cutty

What you are looking at is spline count for the axles.
Disconnect the driveshaft, pull the yoke out and count the splines. 30 splines 8.5 guaranteed.

70cutty

Make this easier on your self, call Jim tomorrow, send him some pictures and see what he says. Jim is like rear end Jedi master.
Sorry about my posting like I said internet connection sucks here.

I firmly believe that you have 8.5 BOP rear end with bolt in axles. Those little square bumps are only on BOP bolt in axles.

70cutty

$280 to basically change the fluid and gasket and take a peek?? If so you need a new mechanic my friend. I pay $60-$80 for that.

Ces

Oh ok cool thx.
I'll do that.

Here's opgi listing Auburn and Eaton posi rears for 64-71, and 64-72, respectively, Cutlass models showing 8.2 ONLY

image_zps4ce2858b.jpg

image_zps13070869.jpg

70cutty

If I wasn't out of the country I would help you, to the extent of my limited knowledge. FYI I paid $350 to get my rear end hot tanked, put it all new bearings,seals, posi and gears. That was for labor, Jim supplied the parts. Your competent mechanic is a rip off.

70cutty

Any news about the rear end

Ces

Contacted Jim. We're working on it.
I'll be sure to let you know what he says.
Thx

monzaz

The rear end is a 10 bolt 8.5 Corporate gm

It has BOLT IN AXLES
The pictures you showed on this site are all 1o bolt 8.5. Carrier caps with the diamond casting and arrows high on passenger cap and low pointing out on the driver side cap. Then there is the casting BUMPS on the cast collar where the tube presses into the center casting on each side. The Pinion nut will be 1 1/4 socket
The yoke will use 4 bolts and 2 straps.
The rear cover is correct for the OLDS rears all the way to 1971 - 1976

THAT IS NOT A 10 bolt 8.2 c-clip CHEVY rear.

Done.

Jim
J D Race

70cutty

I would go back to that extremely competent mechanic and ask for your money back.

Ces

Awesome man, thanks so much.
I'll be in touch about a posi setup.
Much appreciated !