1973 280c whining rear end.

[spamman450]

Hi everybody, i purchased a 1973 280c last August and have been driving and wrenching on it ever since. The car is in great condition and is a pleasure to drive. My only concern is the rear end is making a whining noise. I would like to replace it and am wondering if a rear diff form a 240D would fit. I have a spare one in my garage. I understand that the ratios are different. the 280 has a 3.92 and the 240 a 3.69. I am ok with the gear difference just curious if they are swappable?

[Frank Reiner]

Yes, the center sections interchange.
The ratio is stamped in the lower right corner of the back face of the housing (not the cover). 3.69 was used in 74-76 280s. Do you know if you have a 722.2 trans (1st gear start), or a 722.1 trans (2nd gear start). Both are four speed.

[spamman450]

Thanks for the info. I believe it starts in second gear. I will check the paperwork later. Really is a fun car to drive.

[kraakevik]

You might consider draining the differential and trying whatever modern lubricant Mercedes recommends first--they are remarkably reliable and robust--I've had one last over 500,000 miles


Tim Kraakevik
kraakevik@voyager.net