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Originally Posted by Gregski
I am not saying you should do this ie run 30 weight motor oil in these transmissions but I have heard old timers recommending this trick to quiet them down, so I just wanted to try it and give you guys a report, other than that, love this gear box
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Any benefit to running it over-full? IIRC, there is an HD transmission that the big diesel guys run with Cummins conversions and such. Maybe it is the NV4500? Anyway, I think they run it a full quart "over-full". Unfortunately, I don't know enough to actually recommend this. Just wondering aloud and bummed that your cool setup is giving you fits.