Alright so about 2 and a half weeks ago I put in Redline SuperLight Shockproof into my differential because of the wonderful things Icemark and a couple others said about it. Now, everything was great for about 2 weeks, and then all of a sudden on monday/tuesday I started getting some weird vibrations from the rear. It does NOT happen all the time, and when it happens it ONLY happens on tight turns at low speeds WHILE accelerating. It has never happened on turns with no acceleration, never happened when not turning, never when going fairly fast (only slow), and it's only on sharp/tight turns. Any ideas what this might be? Does it sound like it's my differential? Could the redline SuperLight Shockproof have affected it?

So any ideas/suggestions would be appreciated. Like, should I change out the fluid to something else (like amsoil synthetic), or is my differential shot?

 

Also, this is probably just one huge coincidence, and I REALLY doubt it has anything to do with my problem, but I'm throwing it out there anyway. The vibrations have also never happened when I'm in my car by myself, it has only happened when someone has been in the passenger seat. Once again probably just one big coincidence, but still I'm putting it out there.

 

When is the last time you changed the drive shaft? the u joints can be going out, it happened to me and 100 shot of nos snapped it

 

Never changed those myself, no clue if the previous owner did. Is there a way to check these and confirm if they are "going out" or if they are actually the problem? Is there even any way to check the differential and check if that's the problem? It seems like it would be hard to know exactly what part is "going out" from checking them if they aren't actually fully broken yet. Any ideas?

 

bump

 

the only real way is to change it out, the whole driveshaft has to come out cause for some reason mazda pressed the ujoints into the shaft which sucks cause its expensive to replace

 

sounds like it might be your u-joints to me, I found a place that sells replacement staked u-joints for our cars

http://www.euro-drive.com/U-Joints.htm

they should be about $40 canadian each

 

Is there any way to check the U-joints and know if they are the problem for sure? Or is the only way to tell if they are actually broken?

 

hahah rearend vibrations!!!!!11!!