Leaking bushings??
 

Today I got under my 370Z to do an oil change on it and I was looking under the differential and I seen wet differential fluid dripping down my differential and it turns out my differential bushings failed and are leaking differential fluid. :shakes head: What are the best brand poly urethane differential bushings for our 370z’s that you recommend installing? What other liquid filled bushings are there on our 370z’s that are commonly known to fail? What other bushings should I replace while I am in there?

The whiteline differential kit is pretty popular.

The only other liquid filled bushings are the front lower control arm. The rear bushing. They don't often fail. Some pictures in my SPL thread.

http://www.the370z.com/brakes-suspen...uspension.html

^ I think this will help thanks .

Common problem. I used Whiteline bushing kit.

Z1 has a bushing kits and a bushing tool too. Most people use a sawzall.

on a '17 I would do Z1 subframe bushing collars while you have the rear apart. At that point it is a 20 min job

https://www.z1motorsports.com/transm...r-p-12015.html

Per bushings, if not longer.

I bought the Whiteline poly diff bushing. Wish I had bought SPL solid bushing cause racecar :driving:

:driving:

The Whiteline poly urethane differential bushings fit but have a tighter fit than other aftermarket poly diff bushings. Great recommendation on the subframe bushing collars.

I just had the Whiteline poly urethane differential bushings installed on my Z they were a somewhat tighter fit but we will see how they do.

This might be an option...

Mine did leak toward the driver side where the axle meets the differential. At that time I fixed it under warranty. But now I still feel like my diff is not working right as the car wiggles when the road surface changes ever slightly. It could be because i'm running r888 at the back and Cup 2 upfront.

Let me know if you feel the tail-wiggling symptoms.

Too many differential bushings available at a low enough price,,,to even consider half azzin’
& squeezing silicone/glue into a rotted rubber cavaty.
Almost be like removing differential drain & fill plugs...then pumping grease in diff from bottom until it escapes from ck. port???
If you don’t have proper tools/skills,,,I’m sure there are members on forum who would lend a hand to perform proper fix.

After the Whiteline differential bushing install the rear feels a lot more firm,positive,and planted to the ground. I would definitely replace your differential bushings because it is more of a question of when they will fail? No wiggling symptoms at all. Yes,with all the differential bushing kits available definitely do it right the first time and don’t screw up your installation I would just hate to have to do it twice. If my hands are free I would help out the Z community with a differential bushing installation.

I would say it's your combination of tires. Not the diff.

I have Eastwest coming to the house to change his diff bushing. He wants me to install the SPL bushing with the Z1 cover.

Nah mate. I loosened the 4 points and removed “w-brace” fitted the collars and torqued it all back up in about half hour. I did it at the point in time mentioned. Definitely recommend while you’ve got the back end apart. I also threw my VLSD in the bin at the same time :D

I've read where a couple of people had a hard time getting the aluminum bushing insert into the oem rubber bushing. If it went that quick for you, then good. :tup:

Really? All mine just dropped snug in place. The lower pieces at the rear of the car needed a tap with a small dead blow and some light lube but went in fine.

The one guy who pm. ed me was having troubles. Told him to spray some lube in the bushing and on the insert.

So out of the Whiteline or the Z1 set of rear diff bushings which ones are the least noisy? And which are easier to install?

z1 poly do not noticeably increase sound or vibration. I can't speak for whiteline.

I have installed 2 SPL bushing kits and JL's Z1 poly bushing kit. The SPL diff bushing was easier to install. There really isn't much difference in noise and vibration between the SPL and the Z1 bushing kits.