Superior tranny oil, Slight tranny sound....how to make go away? Options

[mepstein]

Sure the good doctor is right as he is referring to the 914 trans which he must know' better than anybody,so whats the secret to Swepco ? which the 911 guys all say improves shifting ,etc in those transmissions,no one seems to mention use in the 914 box that I thought was rather similar in design (IMG:style_emoticons/default/confused24.gif) .
Oil samples can't always be trusted ,last large vessel I ran had a massive gearbox failure due to worn out thrust bearing ,a recent oil sample showed no elevated levels of the bearing material in the oil,end result was a 6 month layup and around 1 million to rebuild it.

Our guys have rebuilt dozens of 915 boxes and only use the GL4 80-90 dino oil.

Some data is better than no data. If you do an analysis on a regular basis you should have seen something.

There is no secret to Swepco, I've run it and it's a good oil just super expensive for anything but race cars.

@mepstein have you tried Motul?

The customers might but ever trans at the shop gets the regular stuff. I wish I had the chance to watch Russo rebuild the 962 trans. Half the internals were titanium. I was busy with other stuff (IMG:style_emoticons/default/headbang.gif)

[second wind]

So I drained my transmission and replaced with Valvoline 80-90 and a quart of Lucas Oil Conditioner.......I believe the sound has gone away. I was low on the tranny oil which could have been the issue, but having fresh fluid in there is a big plus. I also switched out my nylon shift rod bushing at the transmission with a brass one I had bought years ago. They call the metal "oilite" or something like that. I have been doctoring the original nylon bushings with aluminum tape and such to lessen the slop in the bushing, but this time I glued the new brass bushing in with JB Quik. My car has never shifted better!! All gears are like butter now. Fifth to fourth used to take a bit of a nudge and light double clutch....but now just a normal shift. All good on this end and thanks to everyone who offered their help.
gg