Aluminum vs Poly diff bushings

[KilluminatiDre]

Pro's and Con's for both please.

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[Dominant1]

Aluminum, lots of Deflection & nvh, poly, less Deflection less nvh, and thats about it.

 

[ice445]

Nvh with aluminum will be god awful. Lowest amount of deflection so nice on track, but you can get 80% there with poly with way less noise. Durometer/shore determines hardness of poly bushings

 

[Gregory347]

Aluminum in the car just 1 week... nvh is extreme, car is my daily driver so they are being removed and replaced with Whiteline KDT934 on Thursday.

 

[Dominant1]

Aluminum in the car just 1 week... nvh is extreme, car is my daily driver so they are being removed and replaced with Whiteline KDT934 on Thursday.

good move, it will be night and day, you gonna drop the cradle?

 

[Gregory347]

Shop that just installed the aluminum inserts is swapping in the Whiteline inserts. Cradle has to be lowered some but not removed.

 

[Jeff's FRC]

I had bmr poly bushings in my diff and the noise was unbearable. Removed them and just run upgraded hardware now.

 

[Jordan @ Lethal]

Aluminum is extremely harsh. Not dailyable. Poly is honestly quite abrasive for a daily as well. I prefer to use stock type busing material in as much of the car as possible for the daily.

 

[Gregory347]

Just to report back on my earlier post... Whiteline KDT934 bushing inserts installed in place of BMR aluminum inserts. Car is smooth again.... vibration and harshness gone.... still have some whining from the diff but it’s nothing like it was....

 

[Dominant1]

Good news, the only way to get rid of the whining completely is to go back to soft rubber, forget that..

 

[WildHorse]

Good news, the only way to get rid of the whining completely is to go back to soft rubber, forget that..

Add sleeves to the stock rubber bushings. I did. Win/Win.

 

[Dominant1]

Add sleeves to the stock rubber bushings. I did. Win/Win.

Like this:

https://ibb.co/12skWzS

 

[WildHorse]

Like this:

https://ibb.co/12skWzS

Yea.

 

[shogun32]

I had bmr poly bushings in my diff and the noise was unbearable.

because the Shore is too high. You want the Whiteline kit.

 

[shogun32]

Like this:
https://ibb.co/12skWzS

the sleeves fix the gap between bolt and bushing but doesn't address the movement of the entire assembly. It stops the breaking of bolts but not the bouncing around/twisting that the diff goes thru.

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