need help with 116 diff part number

[Pooka]

I have a 116 differental from a 1973 450 SE with a part number of 116 350 0401. It is a limited slip.

Anyone know the ratio on this? I cannot find any reference to this part number anywhere.

Pooka

[DeliveryValve]

Look facing the cover, on the lower left corner, you should see the ratio stamped on the flat surface. Typically that area is covered with dirt, grease and rust that you can't see it.

Disregard the other arrows and bolt sizes. I took this from another source.

[Pooka]

Thanks for the info, but now there is a new mystery.

All that is stamped into the flat surface is an "S". I will take some photos tomorrow and post them.

This also has cooling fins on the cover plate, and the cover place is cast aluminimum and not stamped steel.

This also has the tag on it that says "Attention: Use special oil".

Photos to come.

Pooka

[DeliveryValve]

I believe you have a 2.65 ratio differential. The w116 with a limited slip (hence the special gear oil for the clutches) usually was a 2.65.

But to be certain of the gear ratio, remove the cover and count the teeth on the ring gear, and divide by the teeth on the pinion gear to get the ratio.

[250 Coupe]

Um... turn the input and count the output turns?

Can't help with the oil but someone at w116.org might be able to, there are a bunch of 6.9 owners there.

Michael

[Pooka]

The numbers are on the back part of the diff housing! They were just covered up with dirt.

The numbers listed are: 058967 2.07

So this would be a 2.07 gear ratio?

There is also an S stamped below the number. Could this mean "S Class" or "Super" or ?????

This came off a 1973 450 SE many years ago.

Pooka

[DeliveryValve]

Originally Posted by Pooka

...
So this would be a 2.07 gear ratio?

...

I am going to venture out to say that it is not correct and in fact it is stating 3.07. I don't think a 2.07 was ever offered on the w116. So I believe you have one of those rare 3.07 LSDs.

[Pooka]

Delivery valve,

You are right. I was thinking that 2.07 was, shall we say, somewhat outragious. I had to put the microscope on it to be sure, but it looks like a 3.07 when I do.

The numbers were right where you said they were, too. I did not see them before as they were covered with dirt, but when I took some photos of the "S" that is also stamped there I could see the code under the dirt. It looked like sort of a 'ghost' image, if you know what I mean.

A lot of scrubbing with solvent and a brass wire brush and the numbers were revealed. I felt like Indiana Jones.

Do you know what the other numbers are, the 058967 that precede the 3.07? I am guessing a production sequence number.

Anyway, much thanks. By the way, with a handle like Delivery Valve, are you in the pipeline business?

Pooka

[mercmad6.3]

what are you going to use the diff for?
be aware that the LSD oil is seriously expensive and only mercedes oil is good enough,don't try using regular #90 with lucas or what ever additives.

[DeliveryValve]

Originally Posted by Pooka

....
Do you know what the other numbers are, the 058967 that precede the 3.07? I am guessing a production sequence number.

Anyway, much thanks. By the way, with a handle like Delivery Valve, are you in the pipeline business?...

I don't know what those number are, maybe production numbers or serial numbers?


No I am not in the pipeline business, but know a thing or two about it since I live in an oil drilling area. A little trivia here that doesn't relate to this anything in this thread.........

The Palin Alaskan pipeline is so massive that it will be using an 1/8th of the world's steel supply.

Steel pipes are in short supply and are getting expensive, and the move to using plastic or poly material for the smaller piping is increasing..... Just a little fact and you can do what you want with it!