I will be replacing the transmission soon on my '93 W124 300D soon and I was wondering what else I should consider doing while I have the old transmission out.

Right now my speedometer/odometer aren't working. This happened four days ago. I don't know if it has something to do with my completely worn out transmission or not.

I also have noticed that my injector pump oil leak is getting a bit worse lately. Is it easier to get to the bottom of the IP with the tranny removed?

I may have another oil leak in the area but if I do it's not much.

In fact, I don't leak/use much oil at all. I have to add about a quart every 5-7K miles. I usually change the oil at around 8K.

I already replaced shifter bushings.

The "harmonic balancer" on the drive shaft aft of the transmission recently rotted off while going down the road. I have asked about this before but nobody knew what I was talking about.

It is a very thick steel ring that is attached to a bracket in it's center via very thick rubber. The bracket is held on the drive shaft by the flex disk bolts.

I no longer have it attached to the drive shaft and I don't know if it will cause any future problems.

I have a new transmission mount that I will affix when I install the new(used actually) transmission.

Flex disks look very good.

I don't know what else to check.

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1993 W124 300D
-297K on the clock as I type this.