95 GSX shakes when driving

[dsmfreak95]

Hi guys, I just bought a gsx yesterday and noticed on the way home that it shakes extremely bad when I let off the gas (just coasting in gear). I'm not very familiar with the awd models since I've only owned the gst. Could this be because of bad u joints? It goes away when I accelerate and it doesn't seem to be making any noise. Any help would be appreciated.
Vehicle info:
95 Eclipse Gsx
Catback
Lowering springs

 

[foxracing4500]

In for answer. I got a bad shake but at 90mph. Im changing rims and tires this weekend though.

 

[dsmfreak95]

In for answer. I got a bad shake but at 90mph. Im changing rims and tires this weekend though.

Does yours do it all the time? Mine goes away when I'm accelerating or at low speeds.

 

[TAMA_player]

When my car start to do that shaking at 60-90 range, for me it means, time to change driveshaft U joints.

If it is not wheel balancing, there's a big possibility it is worn U Joints.
I also own two pickups (nissan, GM), the symptom and cure is the same.

 

[foxracing4500]

Yeah my problem is only at high speeds. Not that I should be driving that fast but once I take it to drags Its better to know how its going to act then not knowing. 75-95mph. I'll check the U-joints this weekend too.