Good used rear end differential as shown. This one looks like it was worked on or replaced. No leaks from any of the seals and they are still soft. Look at the condition of the ring gear. Everything looks good inside. If your rear end is howling, replacing it with a good used unit is the best way to do it. These rear ends can be very expensive to overhaul PROPERLY.
Product Details
If you have a 123 240D or 300D non-turbo and desire better fuel mileage for freeway driving, then I recommend you replace your rear end with this lower-ratio unit. I have done this on a number of 240D four-speed manual cars, and it makes a great conversion. On the 240D automatic, you will lose low-end acceleration on takeoff - you will have to decide what you need most. When placing this in a 300D non-turbo, adjusting the shift points will not significantly impact power. You will notice a lower engine speed at 70 mph, which is a notable benefit.
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Late W123 Chassis Differential Rear Axle Seal
We recommend you always replace this seal when removing and replacing your rear axles. You will need two of these if you are working on both axles. Seal fits on either side of the rear differential that uses can style rear axles. They will fit rear ends with ONLY can-style axles.