Clunk in the rear when I shift...
 

...what can it be? Diff mount? Transmission mount? I know my front diff mount is not as tight as it should be; I didn't torque the two bolts (you know, THOSE two bolts) because it was bloody impossible to stick a torque wrench in there.

So what could be the problem? Thanks for helping out!:D

sounds like a diff mount to me

I get that too...usually when I'm at a standstill and I shift to first gear.

When i downshift it get a nice clunking sound, im sure its unhealthy...

Broken diff mounts, all of you. :)


https://www.rx7club.com/forum/showth...hreadid=164843

mine was doin sumthing like that..my shop says its the u joints on my driveshaft..i think we have to replace the whole driveshaft..so i hear..u cant redo the u joints.

You can get a driveshaft from mazdatrix that has replaceable u-joints. Problem is, it's like $300 or something like that.

if you have lowered your car the sub frame may be hitting body that is what i had between shifts when i used a rear camber adjustment rod that was set at almost a perfect 0 but had to give a little negative about 0.5 to 1.0 on both rears to stop the clunk

i also had a broken rear diff mount just before that..and the guy that did it did not mount 1 of the link bolts on back correctly.... but it got fixed when 5000 miles later i did a tyre rotation and check the wheel and there was suspention/wheel play

I am pretty sure it's not a broken diff mount. It might be worn out, but it's definitely not broken the last time I checked (2 weeks ago).

i would say check your driveshaft or differential

Same noise, same problem some time ago. Rear U joint.. Not cheap replacement. Yes, you will need a new drive shaft.

A bad U-joint will usually resonate in the driveshaft and give a "tink" sound as you start out.
A "clunk" of "thump" is usually something shifting position in the suspension.

With a clunk - thunk here
and a tink - clank there
Old McDonald had a 7, E I E I O..

Are you feeling OK? :)

Where do you get upgraded Diff Mounts? Do they make any or Is It the bushings themselves that are available through aftermarket?

What about clunking in the rear while in gear and moving? I noticed this on my friend's GXL but it needed a new tranny. Is the rear end shot too or could it be just the tranny jerking?

M'trix sells an aftermarket front diff mount. Thats what I have. No noticable difference, except for the fact that it hasn't broken yet, of course.
http://www.mazdatrix.com/g8.htm

Thanks. Kind of strange that the competition one Is half the price of the stock one! With the absence of the weight/block on the front of the competition Diff Mount, Is that to say It's not needed when Installed?

In my experience that would be a broken rear subframe. especially common on modded higher HP cars. Solution depends on how it broke, eithe a new subframe. or repair the old one. For any car that will be making substantial power, you should go through the subframe, and gusset all the weak points. While you have it out replace all the bushings with competition pieces. Hope this helps, Carl Byck

Yes.
And anything is cheaper than the dealer. ;)

With the absence of the weight/block on the front of the competition Diff Mount, priced cheaper than the dealer and am confirmed I do need one, I'll add this to my list when I Install my upcoming Energy Suspension Kit.

sounds like ur rear is gone!! need replacement!!

u can goto ur local junkyard and get a rearend for cheap!!

....:confused: Do you know what you're talking about?

BTW does anyone know what that counter weight on the front diff mount is for? Vibration reduction perhaps?

Im getting a rear clunk in my FD. Was told it was the diff mounts, I changed them, still get the same clunk.....
Its when i engage or disengage the throttle, and when shifting at high rpm.....

Wow... Almost a 9 year revival. And for an FD in the FC technical section.

You're experiencing some sort of differential clunking. I don't have any experience with the FD's. Perhaps there's a pinion snubber thread in the FD technical section...?