Looking at buying a really nice 2004 5spd 2wd with 77k on it. Just noticed some Trans whines a little in 1st and second. Very Faint. Common? I have read to change the fluid to Redline. Had V6 Mazda MX6 5 speed and did this. I put GL5 Valvoline in it first and wouldn't shift very notchy and grind on down shifts. Switched to 2 MTL's 75-90 & 1 MT90 and it was buttery smooth.
I have read here that this happens with these trans but is there any reliability issues? If it last 150k or more no biggy if it makes a little noise.