I got the typical rear end clunk and it is obviously the rear brushings. How many miles of non-hard driving do you think I can go before this gets more serious? What happens if I don't fix it for a while...cost too much man.

 

Well man the day I bought my 93 I was totally aware of the noise however I knew nothing about RX-7s and their little "quirks", I was so in love with the car the clunking didnt matter to me. That was about a year and a half ago and I now know MUCH MUCH more. I started "trying" to fix the clunk about 6 months ago with new M2 trailing arms, didnt do the trick, real recently I pulled the wheels and looked at things for myself, I noticed my toe link bushings are shot so I have a set of Pettits on the way also I noticed the pillow ball "bushings" were bad on the upper control arm. Keep in mind I have driven with the annoying clunking for well over a year and it hasnt gotten worse and the car still handles well however I feel with the new pillow ball bushings and Pettits installed its going to be sort of compareable to my old 99 Miata, only alot more power!!! Anyways, in short I am saying no it wont hurt more, its already broke, cant get more broken(worn out rubber bushings that is). Hopefully I gave you some good advice, sorry for rambling...

 

Oh and I have driven it for about 9K miles and it wasnt so NON-HARD driving, a couple trips to the track too!!

 

good point about it not being able to get 'more broke' OneBadRx7.

IMO, the only thing to worry about is the possibility of uneven tire wear.

 

That is also true and had noticed that, nice call.

 

Hey Jimmy I just noticed you were from Iowa, where abouts?? I'm in Dubuque, let me know, later.

 

It might also lead to your alignment shifting on a regular basis. I find that my alignments are only good for a couple weeks now ... I suspect that the bushings are at fault for this. From what I've read from other forum members, the rear "ka-thunk" is easily remedied with replacing the differential bushing ... ala unobtainium bushings or whatever you might choose.