My 2003 cr-v ex with 5 speed started doing a vibration/shaking thing at lower speeds under heavy load. Under light load its fine after about 30mph its fine even under heavy load.
Car has new half-shafts both sides and it made no difference. Put new tires on and it made no difference....wondering what it could be?

 

Sounds like U-Joints. Mine did the same exact thing and I had to replace them just a few weeks ago. the bearings inside the caps were all worn and rusted.

 

the u-joints on the drive line for the rear?

 

http://www.theujointstore.com/44310.html
you need two of them

 

I am having the same issue. Its normally when I shift into 2nd accelerating under light/moderate load and goes away after about 25-30mph.

Guess I'll need to invest in U-joints.

 

hows your engine mounts?

 

Make sure when you are replacing the ujoints you follow this video:
http://www.youtube.com/watch?v=nJIL1vJDILY
It has 17 parts, watch all of them.

 

I used those same vids when I did mine. Worked great. My symptoms were mostly vibration at high speeds though.

 

Have the same issue, had to re-balanced tires, alignment and finally change out to new front axles... Still had a little bit of shake on low speed then it gone over 25-30km.
If only I know it was just the U-Joints could of saved myself some money....

 

Yeah, changing out the U-joints is pretty simple with the right tools and a little help. Did mines in 2 hours with help from my buddy.

 

Vibrations under accelaration that goes away when coasting are caused by the CV axles or driveshaft..

Had that problem with mine. Also shook turning left under accelaration only, ended up being a bad left axle joint.