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how to: diff bushings

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Old 08-21-05, 10:25 AM
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how to: diff bushings

alright. . . i got these urethane bushings from fdnewbie as a beta test. first of all. . . thanks ramy!!!! they installed great. . . 2nd, i cant drive the car due to some exhaust issues that happened during the installation. it sucks. . . just make sure you dont do custom work BEFORE you make sure the engine and transmission and differential and ppf are in good straight lines. ;(

anyways, the construction is great. . . sorry, i didnt get any pictures of the bushings themselves. . . i thought i had. . . anyways, heres the deal:

first youll need to jack up the car. . . all i did was the rear. no real need for the rest of the car to be up in the air unless youre planning to do something else. . . as i will be doing. :/ take off the catback while youre doing this. . . after the cars jacked up.

then, take off all the covers in the rear. this will show the braces that need to be removed in order to get the job done.





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Old 08-21-05, 10:29 AM
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then, jack up the rear end. . . just support it. . . anyway will do fine.

once supported, loosen the bolts/nuts that hold the diff bushings to the subframe.







i found that going directly below the nuts/bolts was the best and easiest way. . . still tight. . . but the easiest none the less.
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Old 08-21-05, 10:34 AM
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after the diff bushing bolts are out, lower the differential until it rests on the rubber stoppers that are on the subframe or something. . . youll see them.

now, its time to loosen the bushing bracket from the top side of the differential. i found it to be easier to do ALL of them from the passenger side. like so. . .





once you get all 4 nuts undone, take the bracket out through the passenger side. . . this is just about the ONLY side with any room. geh.
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Old 08-21-05, 10:38 AM
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and here you have the culprit. . . the clunk maker. . . the back breaker. . . bleh. . . the diff bushing bracket.



notice the cracked action on my bushings. . .




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Old 08-21-05, 10:45 AM
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now, just find someone with a press. . . that should be easy right???? hehe. . . garfinkle to the rescue.




heres a picture of the nasty old turd. . .



and a comparo. . .





and a picture of what your wife will do once she catches on to the fact that youve spent so much time on your car!!!!!



alright, i hope that was a good enough write up. . . sorry if i missed anything. the installation is obviously the opposite of the removal and pretty much straight forward. i didnt think it was as hard as everyone else mentioned, but i could see how it could turn into a task.

once i get road worthy again, ill take the car out and let everyone know how they feel. one thing i noticed already is how STIFF the diff is. . . and should be!!! my other bushings allowed me to push on it with just my hands. . . moving it about 1/4 inches. yikes!!!

hahaha, anyways. . . i hope this helps some people out there. . .

paul
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Old 08-21-05, 12:58 PM
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and thanks to ramy, here are some pictures of the bushings UNinstalled.




of course. . . they have some pretty hefty pins in the center.
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Old 08-21-05, 04:30 PM
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nice. this was one of my all time favorite mods. im putting on some AM trailing arms from eyecandy this week. i hope it makes it even more fun to drive.
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Old 08-21-05, 05:36 PM
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were you able to notice any kind of a difference after you installed new or upgraded diff bushings? i cant wait to find out what its like.

paul
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Old 08-21-05, 05:45 PM
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yes it cleared up almost all the drive line slop. the car also did not pull to the side in the rear on hard launchs. they make a slight whine noise, but it sounds pleasant at times.
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Old 08-21-05, 06:21 PM
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As an aside, you CAN get to those bolts that mount the bracket to the subframe through the suspension from the side. Pull the wheel and get a nice long extension. Also allows proper torqueing.

I went with the Mazdaspeed bushings... very nice. Shifting feels like moving a lever in a rock, really solid. Good mod, though the trailing arm bushings were better (REALLY feel that clutch engaging )
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Old 08-22-05, 11:59 AM
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yeah, i thought about pulling the wheels off, but decided to just leave it alone. . . haha, lazy i guess.

i cant wait to see what it feels like. . .
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Old 08-29-05, 08:26 AM
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well, the bushings feel great. no more slop. everything feels nice and positive.

the FIRST thing i noticed was when i was backing out of the road that leads to my house. . . there was a definite "whine" sound. i assumed it was going to be a little more noisy. the loudest is while in reverse.

while going down the road, i no longer hear clunks or feel shimmies. the car feels a lot more solid now. there is a TINY bit of whine. kinda low pitched. . . but not too bad. if i had my radio on. . . i wouldnt notice it. OR if i still had tortoise launcher catback on there. . . i doubt id notice it.

i do understand that a major reason for this to be SUCH an upgrade for me is that my old bushings had already failed. i can say this however. . . stockers WILL fail. these. . . should last A LOT longer. . . theyre solid.

over all. . . i love em. no reason to take em out. i dont know what it feels like to have metal in there, but i can assume its not something i really care to deal with. this was nice. . .

BIG THANKS TO FDNEWBIE FOR LETTING ME TRY THESE OUT!!!!!

paul
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Old 08-29-05, 10:53 AM
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Do you notice any vibration in the higher RPM range? (~6,000+)
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Old 08-29-05, 11:06 AM
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i havent had any issues like that. ill run it up a few more times just to make sure, but i havent felt ANY major vibration. . . just heard the noise. thats all.

these bushings can be squeezed, they arent hard like metal or even plastic. . . just harder than the stockers. i dont know what the durometer reading is for them, so. . . :/
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Old 08-29-05, 07:00 PM
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I NEED a set...FDnewbie, want another test subject???
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Old 08-29-05, 09:21 PM
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Originally Posted by rotorbrain
over all. . . i love em. no reason to take em out.
Paul, whatcha smokin? Now that you've tried 'em out, take 'em out and give 'em back! :rofl I had ya going there for a sec, didn't I?

NP Paul. I'm glad you like them, and I was confident you'd do an excellent and fair writeup about them. You proved me right Thanks for the writeup and your impressions!

And the reason they're not hard is cuz they're made from made of 90A polyurethane, which is the expensive high-grade material.

Originally Posted by TeamChin
I NEED a set...FDnewbie, want another test subject???
Thanks for the offer, but I already sent another set to Phil (Herblenny), which is one more set than I anticipated. One of the main reasons is these bushings are a huge PIA to make, since urethane is so hard to cut accurately. These CANNOT be machined. They must be done by hand using a grinder, so they're done one set at a time.

The grinder has tolerances of 1/1000th of an inch (.001), so it's very accurate. But I think +-.005 is good enough for bushings, which is why Paul got a set with .005 difference from each other.

~Ramy
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Old 08-29-05, 09:51 PM
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Originally Posted by FDNewbie
Paul, whatcha smokin? Now that you've tried 'em out, take 'em out and give 'em back! :rofl I had ya going there for a sec, didn't I?
hehe, ill get em back to you ASAP. . . I PROMISE. . .

Originally Posted by FDNewbie
NP Paul. I'm glad you like them, and I was confident you'd do an excellent and fair writeup about them. You proved me right Thanks for the writeup and your impressions!
i figure im good for SOMETHING on this forum. . . or maybe some of my slightly sarcastic remarks tickle someones fancy. hahahaha

Originally Posted by FDNewbie
And the reason they're not hard is cuz they're made from made of 90A polyurethane, which is the expensive high-grade material.
eee-eee-eeee. . . . ::pulls on shirtneck::. . . . . thanks?!?!?

Originally Posted by FDNewbie
Thanks for the offer, but I already sent another set to Phil (Herblenny), which is one more set than I anticipated. One of the main reasons is these bushings are a huge PIA to make, since urethane is so hard to cut accurately. These CANNOT be machined. They must be done by hand using a grinder, so they're done one set at a time.
when i saw them i was pretty surprised that they were done by hand. . . very nice workmanship.

Originally Posted by FDNewbie
The grinder has tolerances of 1/1000th of an inch (.001), so it's very accurate. But I think +-.005 is good enough for bushings, which is why Paul got a set with .005 difference from each other.
heeeeeeeeeeeeeeeeeey, why i oughtta!!!!!!

seriously. . . i wouldnt have known if you hadnt said that just now. they both went in just as expected and felt like they had the same fit.

GOOD WORK. lets see some more!!!

paul
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Old 08-30-05, 11:38 PM
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Nice Write up Paul!

I'm going to pull it out soon... maybe this weekend and install the bushings.
By the way, Bushings looked great and definitely quality work.

I will also take tons of detail pics. I'm currently trying to pull an engine from another car and put my new engine in. Phew!
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Old 08-31-05, 08:17 AM
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looks like your work is cut out for you phil!!!! have fun. . . the diff bushing replacement wasnt nearly as bad as i thought it was gonna be.

paul
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Old 09-07-05, 07:04 PM
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To anybody in this thread who has recently replaced their bushings - I might be interested in buying your old ones -
https://www.rx7club.com/showthread.p...=1#post4747981
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Old 09-07-05, 08:27 PM
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Will these be offered at a lower cost than rx7.com diff bushings which is at $120/set?

I freaking hope not since I got a set sitting right here.

I'd be interested in other suspension bushings. Poly don't require as much maintenance, don't they?
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Old 09-07-05, 10:13 PM
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The rx7.com bushings are plastic; these are urethane. We're working on making a few (very very few) complete sets, as the amount of manual labor required is simply making it not very worthwhile lol. We may have a small amount of material left to make one or two more sets of diff bushings only. Price is still TBA, depending on how long the material we have left lasts.

Thanks
~Ramy
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Old 09-08-05, 10:19 AM
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mmmmm. . . ramy. . . COMPLETE sets???? mmmmmmmmmmmmmmmmmm. . . me likey. hahaha
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Old 05-27-07, 01:42 PM
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Pics dont work - any chance of getting them back up?
cheers
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Old 06-02-07, 10:43 PM
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Originally Posted by BobfisH View Post
Pics dont work - any chance of getting them back up?
cheers
Please!
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