I have been doing some searching on differential bushing upgrade and i ended up buying the JIMLAB BUSHINGS Teflon bushings. Now i have them in my hand they the seem way two hard. I smack them together and they sound like a solid hard ceramic type of noise. I just wanted to get some opinions from guys who have them before i install these on my diff. I do no racing on with my FD except aggressive street and highway pulls I want to make sure these bushings wont be too harsh and wont give me vibration.

 

I can't say directly because I've never used them but the consensus seemed to be they're way too hard, even the race guys were pulling them out.

 

Don't bother unless you want to drill all the control arms for grease fittings and lube them every few weeks. Go with something like super pro. Its not that they are too hard, its that they clunk unbearably.

 

They are POS. Search under my avatar and you'll see why. Lesson #1 grasshopper: don't buy bushings designed by a Microsoft software engineer. Especially one whose RX7 has been on blocks for 12 years.

 

The diff bushings from www.rx7.com work very well, highly recommended.

 

aaah great. now i gotta sell these and buy other ones.............dammit.

we should have a parts rating poll section on the forum. Unless there is one and i don't know about it.

 

Nope, just the 'search' function and spend some time researching.

 

The diff bushings are fine but in my opinion for track use only. The driveline and tire noise is much louder, no slop at all but you must be smooth to avoid violent instaneous driveline shock.

I think Pettit Racing sells a similar diff bushing and they do not recommend them for any kind of street use.

 

So what do you guys think i should get. i do mostly daily driving and highway pulls. stock or rx7.com or other ?
fritz pm me if you have a set for sale.

 

third pic down:
http://www.rx7.com/store/rx7/fddrivetrain_rearend.html

I've been running these for years and love them. Solid rear end, zero noise. My dad is having a set installed in his FD next week, and his R1 is a lightly modded street car.

 

Does any shop or any one has a set of the rx7.com in the tristate area? I hate waiting around for parts

 

thanks for the feed back guys,I should have done heavy researching before buying these.I just ordered a set from rx7.com and they will be here soon. thanks

 

The stiff diff bushings don't need lubrication. The diff isn't designed for movement anyways.

 

Install the bushings. You will be pleased with how much more stable the rear end will become. The differential isn't designed to move around. When the factory bushings start to wear, the rear diff will shift changing the rear suspension geometry making the vehicle feel less stable in cornering and acceleration. I've had these bushings 4yrs on my street fd. With stock exhaust, you will hear a slight rumble from the rear since your loosing the rubber isolation. But it's not loud at all and you will easy not notice it a day or so later. Just remember though, when you install these bushings, you will also notice any play in your differential assembly. It's more like a thump in the rear in on/off throttle situations. All this means is the shims in the diff need replaced and or adjusted. The stock fd does have this play in the diff, you just never notice it with the factory bushings. With the solid diff bushings you will if it's excessive. To check for this, all you have to do b4 hand is raise the rear and put on the parking brake. Then use you hand and rotate the drive shaft back and forward. Mine moves quite a bit. That's the play you will feel. I'm getting ready to remove mine shortly to adjust it.

 

I think he was confused and was referring to the control arm bushings.

 

Sorry to derail, but does ANYONE know what happened to Jimlab's V-8 Monstrousity???

I searched but could not find anything. When I was more active on this forum, I think it had more pages than David Hayes' 3 rotor ordeal.

Thanks

 

If you'd done a little more research, you might have discovered that there's no difference between the diff bushings sold by Rotary Performance and mine. In fact, they blatantly copied my bushings (confirmed by Ari) and started selling them. Just FYI.



Dramatic sensationalism aside, anyone considering stiffer diff bushings should first check the condition of their motor mounts. Stiffer differential bushings will quickly reveal problems with broken or burst (they are liquid filled) motor mounts, which can be damaged by age and leaking oil. They should be replaced in tandam, since the drivetrain is supported only at the front and rear of the car.

I had it deleted. I changed my mind enough times that much of the information was no longer relevant to the project (although probably still of use to anyone wanting to learn more about cars), and because a few asshats I could name were continually crapping in it.

 

well i will compare both once my rx7.com bushing come in. Jim i should have done more research on these but the problem is that they feel so hard and sound more like solid porcelain when i knock them together. I could be wrong but i will see what happens.

 

Ok a little update. I just received the rx7.com diff bushings and as "JIM"stated "they are exactly the same" . The only difference i see between the two is the material used (Teflon)vs(nylon)but the rx7.com bushings are just as hard as the jimlab bushings.

And to correct what i said before about the ceramic sound they make when i smack them together was only because the metal sleeves where inside. The rx7.com bushings make the same sound when i smack them together when the sleeves are in and when the sleeves are not in the bushings they sound like plastic.

The jimlab bushings look better than the rx7.com but i will take rich (GoodfellaFD3S) advice since he has been using these for quite sometime. thanks guys

 

They're both made from Nylon.

Nylon is an acetal plastic. Although it can compress slightly it doesn't take kindly to sharp blows, so stop whacking them together.

 

I've got JL Diffrential bushings in two of my cars. No problems with them. I also run my diff brace, tranny brace and girdle also.


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