Car shaking when accelerating at 40 MPH

Thank you for the response! The rear bearings are good I just checked them today. I jacked car up on jack stands and chocked rear wheels. Put the car in drive and let wheels spin. The shaking is there but not as bad as i'm assuming because there's no load on the drivetrain. It's coming from the front I think the passenger side. Checked for bent rim old school style. There's a wobble in the wheel. Swapped front wheels and that wheel wobbles too. Took wheels of completely no shaking. Narrowed it down to the wheels. Upon inspecting the mounting side of wheel I noticed that the backs are corroded badly. The alloy is pitted and not even in many spots where it mounts. I have the chrome 10 spoke wheels i'm assuming they are made from aluminum. The fact is all the wheels are like this I guess from age and yes in Pennsylvania they use a ton of salt on the roads! I don't think the front wheels are mounting perfectly flat on the hub. I'm not sure why this didn't flag when they were balanced. I torqued the lug nuts to 120 ft. Lbs which I usually do at 100lbs. And it did seem to help it's not shaking as bad. Maybe this is why at speeds over 45-50 the shaking goes away? Like a balance problem that corrects itself after speeding up? I'm thinking about higher torque for lug nuts but I'm not sure how high I can go. I do know that my back-alley tire place puts those lugs on with an impact and sometimes I can't even break them with a breaker.

Thank you! I will try this. I've been underneath the car since my last email looking at things again. I put car in neutral and jacked up side I feel it's coming from. Turned wheel back and forth by hand while watching CV joint. There is some play i'm worried about with the joint that goes into transmission. I will try to get it on video and send it. I know some play is normal but i've got a gut feeling that mine isn't normal and the axle is jumping around. I can show you this on video with the car sitting still. Trying to find a way to mount my phone to record while driving so I can see if the shaking corelates with a jumpy axle.

Here's a short clip of the play transmission side. Does not appear to be coming from output shaft but rather the connection and cup to the axle. Everything is seated. It was a $50.00 axle so maybe it's junk, don't know. No clicking either from joints.

Yes, it is play at the input shaft but it seems to all be in the cup. I checked the shaft when I had the axle off, and it didn't move. It is fully seated. I looked at reviews online for the brand I bought and there are similar complaints about that inner joint. I ordered a new axle by car quest and spent more money for this one. I will return the other to rockauto. The shaking is coming from the engine jerking on the mounts. I believe the jerking is being caused by that inner cv joint. I had front end up and in gear and accelerated and just slight shaking. I then power braked to create some torque and sure enough there was the shake. I have a video of it I can send you later. I'll update you later this weekend after I replace the axle. Thanks for your replies!

Well, put the other axle in today. There were some obvious differences between the CarQuest and the track motive. The most obvious was the length. The track motive I had on was about an inch longer than the CarQuest and the inner cup was smaller. I chose to put the CarQuest on because t hats what I put on the other side about a month ago. The stub shaft just fit really loose inside the track motive. It fits great now and it's much tighter and no play anymore. It was a wise choice. But, sad to say it did not fix the problem. Still shaking from 30-50 under acceleration. I had stub shaft in the Trans and checked for play and there was maybe 1mm play but would that little bit of play in the Transmission because that much throw to shake the whole engine? I don't know what else to do. I forgot that I did have struts off and knuckles when I did ball joints and did not have front end alignment after thar I just marked everything. Also I loosened axle nuts and retorqued them on both sides. I am hearing slight humming now. Maybe I'll throw some dollar signs at the hub bearings or should it be front end alignment?

I'm attaching video before I changed axle. You can see in video first seconds running car no power braking. Then I power brake and you can see car steering to shake also exhaust and everything. I just really hope it isn't the tranmission. Never had any problems with it. Had car from brand new. Was taken care of.

Yes, new one on. Did not fix. Going to try a hub bearing driver's side. Would a transmission problem cause this? Also going to see if advance auto will swap drivers side axle. That one is new as well but maybe there is something wrong with that one?

Found the problem. The driver's side axle is bad. I just replaced it 2 months ago, so I never thought it to be a problem. Thought to myself today I'll just replace it under warranty to rule it out. Took it off and the inner joint was toast! Couldn't believe it. Anyways put the new one on and the problem fixed!