Occasional grind in 3rd gear Options

[GotToyota]

Occasionally while driving, my transmission whenever going into 3rd gear. I know the tranny was replaced earlier before I bought the car, but what could the grind mean? I'm going to try to put Synchromesh transmission fluid and see if that could fix it, but what else could it be?

-Matt

[ILoveMySilly97]

So my 3rd gear only grinds when my transmission is cold. But when it's at the correct temperature it doesn't grind at all. It rides perfect. The previous owner put in a new clutch about a year ago. I topped off the tranny with valvoline gear oil after replacing my passenger axle. I was thinking about maybe draining my tranny fluid and fill it up with Penzoil synchromesh. Any clue?

[Special_Edy]

So my 3rd gear only grinds when my transmission is cold. But when it's at the correct temperature it doesn't grind at all. It rides perfect. The previous owner put in a new clutch about a year ago. I topped off the tranny with valvoline gear oil after replacing my passenger axle. I was thinking about maybe draining my tranny fluid and fill it up with Penzoil synchromesh. Any clue?

Yes I would try replacing the fluid first. Make sure to use the correct viscosity, its 75W-90 I think but definately double check that. And dont overfill it. 3/10s of a quart over WILL make it work incorrectly.

Maybe you have something like 125 - 140 weight in there(I cant remember the standard viscositys) which is thicker. The problem would only become apparent when it was mucho cold outside if you had to high a viscosity,.