Pete:
I think my wagon is a 2.65. I've seen the number 2.65 several times in searches.
I just found a post from stevebfl where he stated that the rear of the W124 E320 (1994 and 1995, and perhaps 1993.....anything with the 217HP M104 and maybe the diesels, too) was 2.65 in either wagon or sedan form. The older wagons with the M103 had the higher ratio differentials: 3.27 in 1988 and 1989, and then 2.87 in 1990 thru 1992.
http://www.peachparts.com/shopforum/showthread.php?t=14825&highlight=wagon+2.65
Tom W.:
I know there's a possibility that the differential on the car is fine, but unless it was replaced at some point, it has nearly 300K miles on it or better. And by the looks of things, quite a few of the last couple K miles were
very hard miles. I got it running and drove it down the street. Got it into 5th gear barely....I was going 35 mph and the car was just about to shake itself apart. Over all the noise and play in the drivetrain (flex disks are shot, differential mounts shot, motor mounts, tranny mount, all suspension rubber completely shot) I couldn't tell what was going on with the differential. You may be right and it might be fine. I'll have to take it somewhere and have it opened up to really find out.
I want to do the swap correctly. I want to have this car for 200K plus miles, perhaps another 5 years or more. The last thing I want to do is just toss the parts into the wagon and see what happens.
I'm going to replace everything I can and rebuild what I don't need to replace. I want the car to perform as if this were a factory build when it's all said and done. The idea of having to do something twice because the part is malfunctioning is very unpleasant to me. So chances are, I will be installing a reconditioned differential in the wagon. And if I could buy a new one for a reasonable amount of money, then I figure I would come out ahead in time and hassle saved.
Brian