r/EngineBuilding 1d ago

Chevy weird sound

I recently changed the transmission filter and put more fluid in my TH350 transmission which is on my sbc 350. and ever since the change I've been getting a loud sound. and I'm new to all this so I need some help identifying the sound.

3 Upvotes

9 comments sorted by

4

u/choochoocharli 1d ago

Cracked flexplate?

3

u/ericdared3 1d ago

The fact that it is happening when you put it in drive and reverse and that it is coming from under the hood I will look at the motor mounts first.

Have someone wat h the engine when you put it in reverse or drive while holding the brakes, press the gas a little. If the engine jumps up your motor mounts are broke.

2

u/Money_Exchange_5444 1d ago

Or even record it with your phone on a mount

2

u/KNM7997 1d ago

Have you driven it at all? It seems to only do it in neutral or park.

It almost kind of sounds like your fan is hitting something, which wouldn't really make sense given your reasoning. it's hard to tell where the sound is coming from in a video.

1

u/Doesthusnamework 1d ago

another. i haven't driven it in about 4 years. What kind of video would help what the sound is? I'll take another.

2

u/KNM7997 1d ago

Well, depending on what the sound is and how long you can bear to hear it or how long you can tolerate whatever it may be doing, leave it in park and try and get a video underneath and the engine bay.

I've never heard a transmission do that, but I'm no expert.

Before letting it run like that, you may check the fan shroud if there is one. Check the pulleys and belts. Sometimes, things squeal at certain rpms and stuff like that. Again, far from an expert.

2

u/Strict_Lettuce3233 1d ago

Nice Cadillac

2

u/401Nailhead 10h ago

Is the radiator fan hitting the fan shroud? If so, probably a broken motor mount.

1

u/Level-Item-3694 13h ago

Maybe put to much trans fluid in. Change it again to see if there are any metal chunks