Shaking car :(

[VSPantha]

Hi All.
I've developed a shake/vibration in my car. It's most noticeable in 3rd gear, feels like something is either off balance or loose. I can feel a bit of movement under my left foot on the footrest at any speed from 30km's upwards... it gets a shake up in 3rd at around 50km/hr.... and even in OD at 100k's it doesn't feel right.
Unsure what it might be... wether it's an engine or tranny mount... or the harmonic balancer... or the centre bearing... or even maybe something in the front suspension.
The big problem I have is that I don't have a trolley jack... or stands.... and it's an SS with FE2 so it's not the most comfortable thing to get underneath to work on. Anyone give me some clue as to how I can check any of the above to try to get a better understanding of what might be going on without being able to jack up the car? Or would I just be better off taking it in to get looked at?

[Brett_jjj]

Mate you will have to get under there to check the stuff you have mentioned,suspension,centre bearing,uni joints etc.Maybe borrow or buy some car ramps.They are fairly cheap and well worth it.Buy them and do it yourself,or pay someone else to look at it.Its up to you.