S550 Rear cradle/diff bushings

[Brent S550]

Hello, looking for some real world experience in relation to upgraded rear subframe/differential bushings. I have a 2019 S550 with bolt ons and E85, will be adding the whiteline KDT953 subframe bushings and superpro TRC4758 diff bushes soon. Are the steeda/bmr subframe braces really necessary as well? Looking to eliminate wheel hop and cut a good 60 foot time without the added parts/weight if not required, thanks.

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[horsepower addiction]

Subframe braces are definitely a good idea. The rear subframe mounting holes are bigger than the bolts so under hard corners they have been known to move. On the strip I don’t know if it would be worth anything

 

[Benjamin Hundred]

I’ve completely built mine out, including the KDT953 and Kelltrac diff bushings. I’ve listed below what I’ve done, very minimal NVH, daily drives like a dream and handles like it’s on rails.
I highly recommend the Kelltrac diff bushings, especially if you’re trying to stay low NVH/daily the car.

• Front GT500 20x11 305/30/20 Continental DWS
• Rear GT500 20x11 315/35/20 Continental DWS
• Front 1" Mishimoto hub centric spacer
• Front BMR SP089 Minimum 1” Drop Springs
• Rear OEM base springs (ride quality and clearance for larger rear tires)
• Both front and rear Eibach bump stops
• Front and rear Steeda Comfort/Active shocks and struts
• Ford PP front control arms
• SR Performance strut tower brace
• 6 Piston Bullitt Brembo brakes
• Whiteline KDT953 subframe bushing replacements
• BMR BK081 LCA Bearings
• Ford Performance toe link bearing
• Ford Performance toe link arm
• New OEM vertical links
• New OEM away bar end links
• GT350 front and rear sway bars (non-R)
• Kelltrac rubber/billet differential bushings
• OEM convertible rear subframe brace
• 

 

[Slow Yote]

If you’re already doing it, you’re going to pull them anyways, spend the little bit of extra money and do it at the same time.

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