I'm getting parts together for the 3.69 diff swap. Been reading about the whiteline bushings & I really do not like the parts about increase NVH. Then the parts about the correct order of the front bushings, small on top, large on bottom, reveres etc to correct pinion angle.

Anyone just replace the rear one? Or are they really that necessary to use at all? I have low miles on my car & the diff I got has ever lower mileage.

 

You can use the stock one with no problem if it's still intact. Eventually on most cars at a certain mileage they begin to leak. If you're not there yet, don't worry about replacing it. Or you can replace it with another stock one when the time comes.

 

NVH effects are very minimal, I wouldn't worry about that.

 

Why spend the time swapping out diffs for more performance and leave the factory POS silicone bushing? You have to drop the diff to make the swap anyway, why not upgrade the bushing as well for a total package? Its gonna fail eventually and you risk the chance of having to remove the diff again to change it out. You'll save time and money by doing it all at once. If you change it out for a poly bushing like whiteline or energy suspension you wont increase NVH at all. Now if you change to an SPL solid diff bushing you will definitely feel and get and increase in NVH.

 

I think I'll not install them......See I have had very bad experiences with poly engine mounts on past cars. Where the mounts tore & then had to be taken out & replaced 3 times. Also increased vibrations big time. Everytime the AC compressor would run the whole car shook. Since I'm in FL I use the AC everyday.
My car only has 22K miles & the new diff has 12K. They look ok. Not like I race the car either.
Thanks for the feedback

 

OP,
Where you at in FL? I have all my parts and I'm doing the swap too. I'll probably be flashing the ecu to Uprev on Monday since it's my day off. What year is your car and what did you do about the driveshaft? I ended up buying 2 08' in MT and AT and swapping back halves. Later on I'll make the drive from Orlando to PST in Tampa for a carbon shaft.

 

You are probably doing the right thing in sticking with OEM. I have not yet changed mine so I can't comment specifically on this platform from experience, but like I have also experienced increased NVH when changing to poly on every single car I've done it on. The laws of physics dictate this. It might not be a negative or a big deal for a lot of the guys on this forum, but it will increase NVH to some degree. Even if only slightly. It's not for everybody.

 

Near Ft Lauderdale. I have a MT DS I'll be swapping the back half to my AT one. 2010 coupe.

 

Took me a bit to get the DS figured out. My car is a 12' and the DS isn't bolted at the center. Keep this updated since you may get yours done before mine, I'd like to hear how yours went.

 

I've had whitelines on G35, there was no NVH increase over stock. Just better feel when accelerating. It's somethign that can be done if you are changing the diff - it will be off anyway. Even when keeping your diff - just a good idea to upgrade those bushings. Stock bushings are crap and are "designed to fail". You can start to see telltale signs of leaking silicone on differential cover belonging to G35-G37-350z-370z with more than 30k miles.

 

^^^ I have the whiteline bushing as well and there has been no nvh increase at all. Also, it's not a polyurethane bushing it is made of a different material. I would change it out while you have the opportunity because the OEM mount will fail. Infiniti wants 1300$ to replace the entire rear subframe assembly just for the bushing.

 

Just replace the old bushings with White Line Theyer great

 

I have the whitelines as well, and the nvh is the same as stock. not to beat a dead horse but just replace them, save some money as the stock diff WILL fail, and sooner than you think.