Our '94 FD is currently at Neptune Speed in Huntington Beach having its rear pillow ball bushings replaced. Wanted to do a complete job, but I understand that the "lower arms" (trailing arms, I think) have bushings that cannot be ordered separately from the arm. The arms are expensive, around $731 a pair, and I elected not to have them replaced. All other bushings are to be replaced with Mazda OEM parts. Question: What is the likelihood that the rear end will still be noisy due to just those two bushings being 117K old?

 

https://www.atkinsrotary.com/Suspens...28-28-52Y.html

 

I guess that means you think we will hear those old bushings, even though all the others will be new. I saw that part listed on Atkins Rotary, but it's a "competition" part. Apparently there is no Mazda OEM equivalent, at least according to our tech, who is replacing the other pillow *****. I would have to buy the whole link to get the OEM bushing, which is unacceptable to me. The price is right, but will the FD128-28-52Y actually work and be quiet??

 

They are 40% stiffer than factory and still made out of rubber. You will not notice any additional NVH.

 

I installed those in 2005 - noticed no add'l noise or harshness and they are still OK.

 

It really depends on the state of that bushing and how worn it is. Mine showed some wear when I replaced the rear bushings iirc but I wound up doing all of them with the Mazda Competition bushings. No observable increase in NVH.

Both the stock and Mazda Comp bushings appear to be available at Mazda Motorsports. Looks like Atkins has them too. I'm sure Ray Crowe can get you the stock bushing.

 

I find only FD128-28-52Y (competition) at Atkins and no listing of an OEM part number such as FD01-28-52Y or FD15-28-52Y for a 93-95 RX-7. The listing has changed since I almost bought from them, but still nothing there.

 

These should be the part numbers for the original, oem bushings - unless my eyes are failing me...
This is the big inner bushing FD01-28-460
The middle and outer bushing is FD01-26-230

 

" These should be the part numbers for the original, oem bushings - unless my eyes are failing me...
This is the big inner bushing FD01-28-460
The middle and outer bushing is FD01-26-230"

Yes. The job is finished now and wife is happy; no more "clanking." The bushing in question apparently resides in the "trailing link" which is illustration no. "28-500B," part no. "FD15-28-50X," in the lower left corner of the image you posted. But notice that no part number is shown for the bushing through which the "28-312" bolt passes. Apparently that means that Mazda thought the bushing was not replaceable. And a new pair of those links costs $731. Too much for me, anyway, when there is nothing wrong with the links themselves. And I guess staying with the existing links/bushings has not impacted NVH, at least according to my wife.

 

FWIW, the parts below were replaced on our '94 FD after 117,253 miles. Done by Neptune Speed in Huntington Beach, CA.
Yoshiya took 15% off the Huntington Beach Mazda dealer's list prices; numbers reflect that. No bushing replacements were done on the car's front end (yet).

FD01-26-220 - $109.36 x 6 = $656.16
FD01-26-230 - $89.89 x 2 = $179.78
FD01-26-250 - $9.56 x 12 = $114.72
FD01-28-42Y - $92.68 x 2 = $185.36
FD01-28-460 - $129.84 x 2 = $259.68
FD01-28-461 - $10.96 x 2 = $21.92
FD01- 28-8C0A - $95.12 x 4 = $380.48
FD01-28-710A - $87.18 x 2 = $174.36
FD01-28-890A - $119.59 x 2 = $239.18 (differential mounting bushings)
Silicone plug (intake elbow air bypass) $6.50 - (fixed boost leak from split rubber cap at AWS tap)
Tax at 7.75% = $171.91
Total parts cost = $2390.05
8.6 hrs labor @ $154/hr = $1324.40
Grand total = $3714.45

 

For future reference, hardrace makes complete replacement arms for the rear and front. They are very good and allow for FAR more adjustment in all alignment settings. They don't make any noise and are available with rubber bushings or spherical depending on preference. Also much cheaper and a lot less labor intensive than replacing bushings since you're simply replacing the entire arm and then getting an alignment.