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CV and Axle Cross Reference

I recently needed to sort through a bunch of CV's and axles to find the right one for a customer. To help me figure out what was what....I ended up arranging and labeling parts.

Since I have seen many questions come up on this subject...I decided to document the results and share them here.



Picture is worth a thousand words...diameter of the CV is the outer diameter of the outer race...Width is the width of the outer race.

Axle length is measured from end to end and axle diameter is the OD of the splines.

Comment or corrections welcomed.
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Tom Butler
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Old 03-10-2011, 02:49 PM
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Thanks Tom, good info and I have to look for a pair of Turbo axels
Bruce
Old 03-10-2011, 03:04 PM
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Hi Tom -

Great info. I did the same thing recently - albeit on a much smaller scale - for my axle mix & match.

CV Joint and Axle/Half Shaft Compatibility

All good info!

Tom D.
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Old 03-10-2011, 03:06 PM
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Tom,

GREAT, thank you.


Can you count the splines?

Can you add the differentiation between the ’69-’71 108 mm and the ’72-’75.5 thinner version.

Can you measure the thickness of the inner race and note if they are symmetrical.

Do you have access to 914-4 and 914-6 (they are different).

The SWB should be labeled ’65-’68 as in the table.

Tom
Quote:
Originally Posted by Tom '74 911 View Post
here
helped with a good post (#12).
CV Joint and Axle/Half Shaft Compatibility


Thanks again.

Best,
Grady
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Old 03-10-2011, 03:13 PM
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corrected pic

thanks Grady

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Old 03-10-2011, 04:32 PM
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Tom,

What a great compilation!

do you have a scale to weigh these components on?
Old 03-10-2011, 05:07 PM
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Randy and Grady

I'll what I can do to add the information you've requested.
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Old 03-10-2011, 05:50 PM
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CV Compatability

Tom,
In your picture showing the CV joints side-by-side the 108mm one for the 85.5 - 89 shows a raised lip on the spider, which I believe faces the inside of the joint. The one to it's left, for the 100mm 75.5 - 85.5 does not show the lip. I'm not sure if this is because the photo is of the outside of the CV or if the 100mm one does not have the lip.
Which is correct for the 100mm 75.5 - 85.5?
Jack
Old 03-11-2011, 03:54 AM
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Grady's subtle hint made me realize that there is a difference between the '69-71 CV (thinner) and the '72-75.5 CV (thicker). I went back and discovered I had both types on the shelf. I updated the chart and the photo with the added CV. I also weighed each CV and axle and included that data in the chart.

I am still not clear which axle goes with the the '69-71 thin CV. If I had to guess, I would say it is the same axle as the later 85.5-89 CV. Does anyone know?

Jack....The 85.5-89 has the raised lip as shown on the inner race. The 75.5-85.5 does not have this lip on either side of the race.


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Old 03-11-2011, 12:21 PM
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This is a GREAT REFERENCE! Thanks Tom.

Now...

Since each transmission has different flange requirements can we start another thread with similar information for the output flanges on the 901 911 and variants of the 915 transmissions? I know I still get confused on the fine/coarse spline output flanges.

Thanks.
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Old 03-11-2011, 12:37 PM
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[wt] = grams?

also I'm not sure re the 2 wt. columns in each row?

thx much for doing all this
Old 03-11-2011, 12:39 PM
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Tom,

It is the other way around:
The ’69-’71 is thicker and the ’72-’75.5 is thinner.

I think an important measurement will be the axle length (distance) for seating the thick vs. thin CV joints.
I think I recall the axles being the same overall, just cut differently.
We need to figure this out.


There is a typo in the chart: 923 not 932.
This is where Porsche’s ‘bean counters’ thought they could get away with using the 923 (2-liter 912E) 100 mm part on a 2.7 911S and 3.0 SC.
Not so, IMHO.

We need to find someone with Dealer info ca. ’80-’84 about the 100 mm CV joints.
There was an ‘unannounced’ ‘non-recall’ to deal with the loose axle issue.


Can you measure the ball diameters?

Is the ’85.5-’89 108 mm, 6-bolt the only one with an asymmetrical inner race?
Which way does it go?
This is a 928S axle assembly and I think the 911 version still has a 928 P/N.


I’ll go pull an axle out of my 914-6 racer and see if I can find a 914-4 version around.
I recall the six uses the same 28-spline, 30 mm diameter as the ’69-’75.5 CV joints.
I have the ’69-’71 thick version on the racer’s 914-6 axle shafts.
The four is the same diameter but a different number of splines (stupid VW-Porsche thing).
Those will make worthwhile additions.


Thanks for putting up with my ‘hints’.
For the first time, we have a real opportunity to get all this ‘right’.
The next step will be the flanges.
This is a real ‘bag of worms’ that needs sorting out.
I used to have much of this info but it was lost 25+ years ago.
Most of this is from my lame old memory.

Best,
Grady
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Old 03-11-2011, 01:04 PM
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Randy...Weight measurements are in grams...In each row, the first is the CV weight and the second is the axle weight.

Grady... I have the early LWB thick and thin backwards??....I'll check and correct
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Old 03-11-2011, 03:03 PM
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This clears up a mystery for me. I narrowed the rear track on my '72 by 10mm each side and just happened to come across a pair of axles at a swap meet that are 9mm shorter than the originals. No one could identify them for me but they are almost certainly the '69-'71 bits.
regards,
Phil
Old 03-11-2011, 04:27 PM
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I knew this was in print somewhere:
Quote:

AXLE DRIVESHAFTS – LIGHTER VERSION

General

Beginning October 6, 1971 production, all 911 models have new and lighter axle driveshafts (approx. 0.9 kp
[sic] (2 lbs.) lighter).
The CV (constant velocity) joints are 0.8 mm (0.31 in.) narrower (dimension A). As a result, the axle shafts are 8 mm longer.

Installation note:

From 1969 models on, old-type drive shafts can be replaced with the new version on an individual basis from 1969 models on.
[sic]

When installing the newer axle shafts, it is necessary to use the new socket head bolts, M 10 x 48, as well as new supporting plates.



Dimension A – new driveshaft version = 32 mm
Dimension A – old driveshaft version = 40 mm
© 1971 Dr. Ing. h.c. F. Porsche K.G.
From 4810.21, Supplement XXXI, 1974, p. 3.1-1/1.

Someone had difficulty finding a German-to-English translator and proof-reader that day.



The reason for the new "supporting plates" (‘moon plates’) is the new version tin cover has profiles for clearance of the balls and the old style did not.
The moon plates changed to clear these profiles.
These are other subjects of investigation.

Interesting is the then-current culture of touting a “Lighter Version”.
Almost unique to the late ‘60s to early ‘70s.
After the 1972 model, the ‘bean counters', took over.



Tom, does your ‘shelf’ have tin boot covers, ‘moon plates’, bolts, Schnorr washers, circlips, conical spring washers and boot clamps?
How about stub axles and transmission axle flanges?

Best,
Grady

PS: For the newer Pelicans reading, some may ask “Why is this degree of trivia important?”
Over the years and for many reasons Porsche changed various sub-systems.
Usually this was to apply more modern technology.
Occasionally it was to reduce manufacturing cost.
Rarely the result was less-than-satisfactory.

Pelicans commonly want to either improve the technology in their cars, return to original after some PO change, or correct some of Porsche’s (rare) mistakes.
Documenting these changes and retrofit ability is important for this.
G.
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Old 03-12-2011, 01:20 AM
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Thank you guys, you have no idea how big a help your posts have been.

Before starting a new thread I hope someone can answer a few questions I have about the 911 wheel hub and wheel stub axle as used on the 85.5-89 year cars.

What is the wheel bearing size, OD, ID and length?
What is the spline used on the wheel hub, OD and number of splines?
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Old 05-04-2011, 02:16 PM
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Quote:
Originally Posted by tom1394racing View Post

Tom,

I have a GKN 911-332-923-01 CV joint ordered from Pelican in my hand and the outer race width is 32mm, not 36mm as you list. Can you verify your measurement?

Based on the above information, does anyone know what the differences are between the 911-332-030-01 and 911-332-923-01 CV joints other than the 2mm width difference (30mm vs 32mm) in the outer race.

My race car has the GKN 930-332-037-08 axle kit. According to WorldPak, that axle kit comes with the GKN 911-332-030-01 CV joints. Yet, as best as I can tell from looking at fiche, the Porsche OEM axle kit comes with 911-332-923-01 CV joints. Also, everyone lists the 911-332-923-01 CV joints as the correct part for the '89 Turbo. The 911-332-030-01 CV joints are for certain 964 and later cars.

Thanks,

Scott
Old 01-20-2015, 08:29 PM
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I pulled one off the shelf and rechecked it.



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Old 01-21-2015, 11:30 AM
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Thanks for what you do Tom. You are very much appreciated.

Henry
Old 01-28-2015, 05:08 PM
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Tom,

Are you sure that thing is a 911-332-923-01?

Scott
Old 01-28-2015, 07:29 PM
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