my spc's needed a light tapping to get them into the actual diff. however the rear subframe diff mount was a pita

 

Thats why i went Energy Suspension urethanes subframe mounts (much stiffer then whitelines) and SPL alumin diff mounts. Fixes all the problems, barely any noise.

 

Do whiteline do the sub frame mounts? more importantly, how involved is doing the subframe mounts? I'm guessing a bit of a ballache?

I'm thinking of going whiteline diff mounts.

 

Good to know... the damn poly mount makes my Z sound like a diesel and it's coming off when I get back home.

 

Which poly mount? what are you putting back in place of it?

 

I bought whiteline subframe bushings and immediately resold them. They were very soft and much happier with Energy bushings.

Yes removing the oem mounts was a major PITA but worth it.

 

Softer than stock? See, i'd use stock if they were sold separately as i have no real problems with them.

Same for the diff bushing, but i think i'll need to go whiteline there as well.

 

I don't remember but I think it's a 90b or whatever measurement they use for "hardness" and I'm going back to OEM.

 

Hmm, so you can get the sub frame mounts from Nissan, just not the diff mounts?


And i assume that you mean the whiteline were softer than OEM?

 

Though I'm not 100% on this... I don't think you can. I sincerely doubt any Polyurethane bushing is softer than the OEM rubber ones.

 

My impressions of the different rubber subframe bushings:

OEM: Soft, smooth ride, does not translate alot of road noise but does not feel super solid around corners, son of a b#$%& to get out.

Whitelines: 3 Piece bushings, Never installed, when i inserted the metal sleeve into rubber bushings they were still very compliant by hand (sorry i don't have a durometer tester at home ), had elongated voids that would allow significant movement.

Energy Suspension: 3 Piece bushings, Solid urethane throughout, was very difficult to deform by hand without metal sleeve, with metal sleeve pretty much couldn't do anything by hand

I'll stop praising the ES bushings now

 

I wonder if you can fit the whitelines without the metal inserts? I would imagine that once inserted, the whitelines would stiffen up, either that or the set you had were out of compliance.

See i don't need anything harder than stock, but i know i'm screwed getting stock for the rear diff bush.

 

The differential went back in yesterday. The difference is astounding. The car feels alive again. It felt like it had double pneumonia and was mentally retarded.

The nvh I associated with the solid bushings is gone. Amazing what a properly set up ring and pinion will do.

I have 100 miles of break in to do and then an oil change at 1500 miles.

 

Exactly!! I took my time, setup my gears right, and have practically zero drivetrain noise with solid diff and urethane subframe bushings. I get a little whine on deceleration from highway speeds but honestly i lke it.