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  #1  
Old 07-02-2008, 09:33 AM
JWJ JWJ is offline
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Annular vs. Homokinetic axles

I need to replace at least one of my rear axles.

With the recent excellent writeup of the procedure, I searched to see what the advantages/disadvantages were to each type of axle.

But, I could not find any explanation.

Please, someone clue me in.

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1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
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  #2  
Old 07-02-2008, 12:04 PM
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I have not seen an explanation either as to which is better. At least for my year of 300D they say you can use either type as long as you end up with a pair of the same type on your car.
I cannot remember witch name goes to which axle but the axle that has the "cans" on both ends of the axle sell for less then the axles with 1 can on one end and the CV joint near the wheel that has bolts going through it.
If I was replacing 1 axle I would replace it with the same type as the good axle.

It may be that the axles service life is more dependant on how long the rubber boot will last than other factors.
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  #3  
Old 07-02-2008, 12:20 PM
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I have also been wondering about this. Maybe someone can enlighten us, someday I will have too do this job and have to figure it out
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1985 Euro 240D 5 spd 140K
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  #4  
Old 07-02-2008, 12:28 PM
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I am not sure but from what I've heard, the advantage of one of them(I don't know which one though) can be replaced without opening up the differential cover, but the other one does.
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  #5  
Old 07-02-2008, 02:34 PM
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OK, I have been some searching on the difference.

The way I understand it, if the axle has one end with 5 or 6 bolts around the flange next to the differntial, then it is the Annular type axle.

The Homokinetic axle have a can on both ends and no visable bolts.

the Homo axles are the original axles these cars came with, then around 1986 the Annular axles were introduced.

with both type of axles the Diff. cover has to be removed to install them.
But with the Annular axles the cover does not have to be removed the
next time the axle has to be replaced. just remove the bolts on the
flange.

Also doing my axle search, the two axles can be used together on either side. so you can mix and match

I not real clear if the 126 and 123 axles can be used either way. from what I searched maybe the earlier 126 can be used.

Charlie
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  #6  
Old 07-02-2008, 05:20 PM
ForcedInduction
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Annular axles are an upgrade. Once you install them you will never have to remove the diff cover again.
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  #7  
Old 07-02-2008, 05:35 PM
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With proper replacement when due, does anyone expect to replace axles again?

Sixto
87 300D
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  #8  
Old 07-02-2008, 05:44 PM
ForcedInduction
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If you had to replace them once, again is always a possibility. It also makes suspension, rear bearing and differential work much easier.
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  #9  
Old 07-02-2008, 06:07 PM
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Quote:
Originally Posted by ForcedInduction View Post
Annular axles are an upgrade. Once you install them you will never have to remove the diff cover again.
Thanks for the info. I was under the impression that if your car came with "Homo" axles you were stuck with that type. Sounds like "Annular" are only sold now? and they will work on all W123, 240Ds for example?
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
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1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #10  
Old 07-02-2008, 07:54 PM
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Quote:
Originally Posted by Stevo View Post
Thanks for the info. I was under the impression that if your car came with "Homo" axles you were stuck with that type. Sounds like "Annular" are only sold now? and they will work on all W123, 240Ds for example?
Well, after reading the posts describing the differences, it looks like my 80 still has the original homo type axles, and my 82 (which the PO had said he had put a lot of new parts into the suspension) has the annular type. So I guess that would be a "yes" to that question. I had noticed they were different looking a while ago, never thought much of it beyond they were just different year cars (kind of like how the throttle setups varied).
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  #11  
Old 07-02-2008, 10:33 PM
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I have been thinking of replacing the axles on my autocrosser. If I do then I should do the (annular?) which unbolts wo removing the cover in the future.

Are they the same price more or less?

Tom W
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  #12  
Old 07-02-2008, 10:56 PM
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Quote:
Originally Posted by Stevo View Post
Thanks for the info. I was under the impression that if your car came with "Homo" axles you were stuck with that type. Sounds like "Annular" are only sold now? and they will work on all W123, 240Ds for example?
There was one of each on my 240 when I first bought it

Scott
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  #13  
Old 07-02-2008, 11:35 PM
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Quote:
Originally Posted by Stevo View Post
and they will work on all W123, 240Ds for example?
Both will work in any W123. If you have the homo axles all you need is the flanges to use the annular.
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  #14  
Old 07-03-2008, 12:56 AM
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Thanks for all the input, I know this job awaits some time and place on down the road

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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