Rumbling noise on acceleration?

[Fiat88]

Don't really know what is causing this but have an idea. When I start out from a dead stop I get a rumbling noise and slight vibration near the automatic trans shifter before its shifts into the next gear. Does this mean my auto trans is messed up? I do get a clunk when I shift into reverse also.

Trans filter and fluid are new but I do have a small trans leak still so I always check on the level. Front motor mounts are new but the trans mount needs replacing. Would a bad trans mount do this?

The only thing thats strange is the noise I remember became more apparent when I had a new muffler put on.

Any ideas whats going on here? Thanks.

[4uall]

I know exactly what that is..........................................it is the trans holding back all the immense power of your Fiat

No idea sorry

[131]

Tailshaft uni joint/s and/or centre bearing would be my first point of call.

[So Cal Mark]

also could be the trans mount has failed, letting the trans bounce up and down under load. I'd look at the driveline and mounts soon

[Fiat88]

Thanks guys will check it out.

[markintheair]

I actually have the same problem, only difference is that i have a 5-speed instead of an automatic. Thought it might be a problem in the differential.