722.315 out of an '85 300TD. This transmission was making an audible growling noise (think bad unitized wheel bearing in a newer car - not a grinding or harsh noise, just a growl/howl) that corresponded to engine speed, but was drowned out at highway speeds. Was more noticeable inside than under the hood. It needed to come out to replace the pump seal, anyway, so I'm trying to determine whether there's any indicators in the pump or if it could be a plugged filter or bad torque converter.

All manuals I can find say "If front bushing has wear or damage, replace pump." All I see is evidence of light rubbing by the torque converter snout - no apparent damage or severe wear. Opinions?

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".