I know where there is a W108 LSD rear axle,
I saw it on the ground
He knows what he has and what it may be worth.

OK, I compared everything again and took pictures.

- The 4.5 rear axle is a 3,27 as shown by the markings on the center casing and on the ring.

- The 250 left axle tube fits on the 4.5 center casing.

- I took a picture of both axle tubes to show that the 4.5 has the fitting for the cooling tube, not the other one.

- The two center elements with differential inside are the same. I did not unfasten the 4.5 ring as I don't want to mess with it, but by putting the other 3,92 ring on top of it, all the bolts coincide. They have the same reference on their head, so I assume the diameter of the thread is the same.

- The two rings have a different shape though, so both ring and pinion should be swapped at the same time.

- I do not have the 250 center casing with me so I could not compare the offset of the pinion. But distance between the two bearings of the central section with the differential inside is the same.

I must surely be missing something but so far my conclusion is the same as yesterday. I believe the central sections can be swapped. But I cannot confirm both central casings are the same, though both left tubes can be interchanged. I believe that the crowns and pinions may differ, but they must be machined in a way that all other elements, including central casing, can be used (but again, I could not compare central casings).

Time ago, I had to replace the sliding sleeve on my 6.3 and got one which was too small. I was told later it was out of a 220. I do not know if this was a ponton or a 111. So smaller rear axles exist for sure, but from the 250 at least, they all seem to have the same size. May be all changed with disc brakes and 14 inches rims.

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One more picture:

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I could never get the 4.5 gears to fit in the 250 case...even though the axle tubes will bolt up.
The pumpkin case was too small..I will do some more checking.

__________________
A Dalton

The crowns may be of a similar diameter but the orientation of the teeth seem to be different. As such, if you tried to fit the 4.5 crown and differential in the center casing while the 250 pinion was still in there, the crown may not have matched the pinion and the diff may have not been able to enter entirely.

I hear what you are saying, but I tried with the cases stripped.
The intention was to get some 3:27 gears into the 113 chassis case/pumpkin without having to change the whole axle assembly from the 4.5 280SE/SEL...
But we could not do it cuz it would not go..and I know others who also came to the same conclusions.

So , that is the extent of our attemps...we now just go with the whole axle b/c of that problem ..it would be easy if we could just use that stock case.That was many years ago when we ran into that problem, and it was with 113 rears [ w/o tube]...maybe there is another case size I do not know about..

Maybe you can give me the exact measure across the two lower axle tube bolt holes , center to center ??
I have a 113 250 rear right here.

__________________
A Dalton

The 3.27 axle swap is very popular with 113 owners and they always swap out the complete axle. It seems common knowledge with them. Why do you want to put 3.27 gears in a 6cyl axle?

__________________
Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT

Arthur, the measure across the two lower axle tube bolt holes , center to center is 3 1/2 inches. Measure across two diametrally opposed bolt holes center to center is 9 1/16 inches.

Tony: I do not want to put 3.27 gears in a 6 cylinder axle but an LSD in a 4.5 axle. I was wondering if a 6 cyl axle could be a donor. I dismatled this 250 axle to get the sliding sleeve in the right joint and went on checking if it had an LSD which unfortunately it had not.

I repeat: I do not have the 250 center case with me so I could not check the offset of the pinion. And I'm not trying to make a point because putting a 3.27 in a 6cyl axle is not relevant to my project. Simply, 4.5 axle equipped cars owners may be interested in knowing that 6 cyl LSD may fit in their car and that less stressed center sections without play in the pin may also fit.

Ok

I will check that in the AM...


That 3.5" is the same ..[ 89mm]

__________________
A Dalton