F@#&!!! My rear diff bushing is leaking! - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #1 of 40 (permalink) Old 05-05-2010, 02:31 PM Thread Starter
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[email protected]#&!!! My rear diff bushing is leaking!

I'm so mad! Z!o: My 91K mile '03 has been absolutely problem free, not one problem, until now! I got a strange urge to look around under the car after I got home last night and I saw the infamous black liquid on the rear subframe!

Has anyone dealt with this issue? I absolutely can not spend the $1300 to have Nissan replace the rear subframe. It is my understanding that the bushing is not sold separately. Has anyone tried these:

SPL PRO SOLID DIFFERENTIAL BUSHINGS For NISSAN 350Z :: Rods, Arms, Bars :: Suspension :: 03-UP 350Z (Z33) :: Nissan :: Speed Alliance

I have no idea how to install these and it sounds like a daunting task to me. Do you have to drop the rear subframe to install this? Can I do this with common hand tools, a jack, and a couple stands?

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post #2 of 40 (permalink) Old 05-05-2010, 02:53 PM
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by rear subframe, do you mean the whole differential? ...yes, you gotta drop the diff...
Here's the dealio, those stock bushing are soft so they can break (enter you). You have a couple options.
1. Those solid bushing you posted are awesome (so I hear, I have looked into them myself). They are a PITA to install (actually, mostly the old ones are a PITA to remove). IF you do it yourself, that is your cheapest and best performing option.
2. Just buy a whole new differential. You can get a whole vlsd pumpkin for 3-400$ All the will require is dropping the old pumpkin and putting the new one in its place.

Hope this helps a little...


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post #3 of 40 (permalink) Old 05-05-2010, 03:00 PM Thread Starter
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Well, I just found this:

SPL solid diff bushings - stop your wheel hop! - MY350Z.COM Forums

So I guess I'm gonna give this a go sometime this month.

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post #4 of 40 (permalink) Old 05-05-2010, 11:28 PM
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I did this install with the car up on stands in my driveway. My pics of the tools i used are on the second last page of the thread. It's not that hard of an install at all, just be prepared to use alot of elbow grease.

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post #5 of 40 (permalink) Old 05-06-2010, 01:01 AM
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I picked up a solid bushing, and I'm going to have it installed in the near future.

It's annoying me that Whiteline does a polyurethane replacement for the front diff bushings, but it the rear bushings that have a reputation for dying. I waited a year for them to release it when they told me they were working on it, and then it turns out its the wrong fucking components.

monk13 - where's your install thread?

"I swear, officer, its all factory options!"


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Understeer is when you hit the tree with the front wheel.
Oversteer is when you hit it with the back.
Horsepower is how hard you hit the tree...
Torque is how far you drag it...
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post #6 of 40 (permalink) Old 05-06-2010, 03:01 AM Thread Starter
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Scathing: The install is discussed in the thread that I posted above in post #3. Whiteline didn't make a urethane rear bushing for the diff because urethane will "cold flow" over time due to pressure. With the weight of the diff constantly on a urethane bushing, it would sag over time.

Willy: The bushing is press fit into the subframe and Nissan sells the bushing WITH the subframe...for $1300! So you have to drop the diff AND the subframe if you intend to use a press to remove the bushing the "proper" way.


I am going to get the bushing and give it a go sometime this month. I know that the bushing is awesome, but I am concerned about just getting the rear bushing and leaving the squishy front stock bushings in. Some people were discussing in that thread about how they thought that the stud could shear off the back of the diff due to torque put on the diff front squishy stock bushings allowing the diff to rotate. I know it's not likely but I really don't want solid bushings on the front too due to gear noise. Maybe I should get the Whiteline bushings for the front?

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post #7 of 40 (permalink) Old 05-06-2010, 09:20 AM
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Quote:
Originally Posted by scathing View Post

monk13 - where's your install thread?
I didn't do an install thread as such, just added to the thread already there. If I had thought about it previously I would of made up a detailed one with millions of pics, but at the time I was pissed at the Mrs, and working on the car was a great escape.

Copy n pasted from the other thread:

Quote:
Bumping this thread again. Spent the last couple of days doing some work on my Z, and these bushes were on the list. This thread was very helpful due to the fact that I knew I didnt have to press the bushes out. In hindsight however maybe I should of as they were a MAJOR PITA. I ended up ghetto rigging a press of sorts for the subframe bush, and belting the absolute crap out of the diff ones. The ghetto rigged press will probably come in handy for others so heres a couple pics.

Tools: Big G clamp and a 2 1/4" socket (had one handy but something else of similar size will do)


Socket placement


Clamp placement


Put the tool that comes with the kit on the rear side of the bushing and use it to center the clamp. Start winding the clamp in. IT WILL BE TIGHT, I got around this by putting a big spanner on the end of the clamp and using that as extra leverage. The socket is big enough to fit over the lip that the bush sits in, and will catch the bush as it falls out.

I really should of thought to of taken photos as I was doing it, but I got a little tunnel vision and wanted it done. Hopefully it gives the DIYers out there a few ideas.

Shane.
Quote:
A socket that large wouldn't be easy to come by for most people unfortunately, Luckily both myself and my next door neighbor work on a mine site and seem to acquire the odd bit of massively over sized tooling...

I probably could of gotten away with not sanding, as the couple of ridges that were there were tiny, but I gave it a quick hit with a sandpaper attachment thingy for the old hand drill (READ: a couple seconds, as I didnt want to take much off the surface. see pic)



I also used the freezing the bush thing as well.
I have been running these bushes for around 20,000 km's now, and have had no drama's. Fire away with any questions desired. Or if anyone in Perth wants a set installed, and is willing to use their car as a tech-write up- demo car, let me know.

Shane

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post #8 of 40 (permalink) Old 05-06-2010, 05:49 PM
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Originally Posted by idrm350 View Post
I'm so mad! Z!o: My 91K mile '03 has been absolutely problem free, not one problem, until now! I got a strange urge to look around under the car after I got home last night and I saw the infamous black liquid on the rear subframe!
Ok. I didn't know we had liquid in any of our bushings. I did have some dark gray fluid on my diff and rear subframe once (after a two-day event). But after asking around, I was told that I had boiled my differential fluid and it had "vented" all over the diff.

I changed the differential fluid the same weekend and all has been well since. (3 events and one two-day school).

My times have been consistent (on our test & tune track) before and after I noticed the issue, so if something else was at play, neither my times, nor my "seat dyno" have noticed.
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post #9 of 40 (permalink) Old 05-06-2010, 05:54 PM
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Originally Posted by Z1NONLY View Post
Ok. I didn't know we had liquid in any of our bushings. I did have some dark gray fluid on my diff and rear subframe once (after a two-day event). But after asking around, I was told that I had boiled my differential fluid and it had "vented" all over the diff.

I changed the differential fluid the same weekend and all has been well since. (3 events and one two-day school).

My times have been consistent (on our test & tune track) before and after I noticed the issue, so if something else was at play, neither my times, nor my "seat dyno" have noticed.
...that was my next question... So what???...is the difference noticeable??

...BTW, here is a step by step DIY for an LSD and those bushings... I have been studying the past few weeks because I intend to do both...

DIY: Cusco LSD Type RS+SPL Solid Bushings (Home Install) - MY350Z.COM Forums


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post #10 of 40 (permalink) Old 05-06-2010, 06:10 PM
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...that was my next question... So what???...is the difference noticeable??

...BTW, here is a step by step DIY for an LSD and those bushings... I have been studying the past few weeks because I intend to do both...

DIY: Cusco LSD Type RS+SPL Solid Bushings (Home Install) - MY350Z.COM Forums

Can anyone confirm or deny that the Z has liquid-filled bushing for the subframe? (or anywhere for that matter)
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