So today I just pulled my drive shaft out, drained and pumped new fluid into the tranny. Replaced the diff fluid as well.

The tranny was leaking, and it was low on fluid when I did this. But I filled it up all the way, I dont really hear anything until Im going about 45 or 50 mph. The tranny shifts good, it shifts better than before, no grinding and smooth as butter.

Do you know what this humming could be? It sounds like its coming from the front

I had the arse end up when I took the driveshaft off and replaced the seal so no fluid came out. I knew I was low on fluid, so I lowered the car then jacked up the right side a little and pumped new fluid in. It was .75 liters short of being full.

If it is a main shaft bearing, would anything happen if I just drive it on the freeway and deal with the noise? I want to drive it during the summer a little here and there, then hide it during fall winter and spring, then I can probably drop a 5 speed in.

Edited July 9, 201016 yr by 71Nissan240Z

Is it possible you overfilled it? What weight gear oil did you use? It is a 4speed & not an automatic, right?

I would have drained it & replaced with Redline product, including the diff.

I used 90W oil. I dont think there is a way to over fill since I stopped filling as soon as it started coming out the hole. Its a 4 speed manual, I dont want to fill it with something so expensive if the tranny is on its way out.

It is entirely possible to overfill.

The Nissan transmissions take a MEASURED amount of lube, you do not fill until you reach the fill hole!!!! 1.7litre for 4sp, 2 litre for 5sp. (ZX BW T5 may be different...)

I did recently install new front brake pads, could one of the calipers be sticking?

Are you listening to the World Cup while you work on the car?

Are you listening to the World Cup while you work on the car?

huh? I was watching it on TV though.

Im probably just going to look for a 5 speed to throw in if my tranny is starting to wave the white flag.

Edited July 10, 201016 yr by 71Nissan240Z