rpinkstn
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- Sep 9, 2022
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- Location
- Richardson, TX
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- 2017 GT Magnetic Metallic
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I"m looking for input on the best method to align and support the IRS subframe assembly in an S550.
2017 Mustang GT Premium
6R80 automatic transmission
Chasis and suspension are 100% original except for the PP1 strut tower and firewall braces.
The car is a DD and might see a drag strip or road course once or twice a year at local events.
I plan to replace the shocks and struts soon but I want to address the IRS subframe first. What is the best option for aligning the IRS subframe and reducing the amount of movement? Reading through several threads on here as well as manufacturer's product descriptions, I'm not sure which product is the best option for this car. I've looked at the following products from Steeda:
Subframe Alignment and Support Kit (Steeda P/N 555-4450)
Link: https://www.steeda.com/steeda-s550-subframe-alignment-and-support-kit.html
IRS Subframe Insert Bushing Kit (Steeda P/N 555-4045)
Link: https://www.steeda.com/steeda-555-4045-mustang-subframe-insert-bushings
IRS Subframe Replacement Bushings (Steeda P/N 555-4046)
Link: https://www.steeda.com/steeda-555-4046-mustang-subframe-replacement-bushings
I've also seen several threads mention an "IRS cradle lockout kit" although I didn't find one on Steeda's website, only on BMR's website. There are a lot of options that all seem to address the same issues. How do you choose which product is the best option?
Based on my previous experiences with basic GM G-body suspension mods I would just choose the IRS Subframe Replacement Bushings (Steeda P/N 555-4046) and call it done but I found several posts where people said the aftermarket polyurethane bushings were too hard and transferred rear-end noise into the car. I don't know if that's correct.
2017 Mustang GT Premium
6R80 automatic transmission
Chasis and suspension are 100% original except for the PP1 strut tower and firewall braces.
The car is a DD and might see a drag strip or road course once or twice a year at local events.
I plan to replace the shocks and struts soon but I want to address the IRS subframe first. What is the best option for aligning the IRS subframe and reducing the amount of movement? Reading through several threads on here as well as manufacturer's product descriptions, I'm not sure which product is the best option for this car. I've looked at the following products from Steeda:
Subframe Alignment and Support Kit (Steeda P/N 555-4450)
Link: https://www.steeda.com/steeda-s550-subframe-alignment-and-support-kit.html
IRS Subframe Insert Bushing Kit (Steeda P/N 555-4045)
Link: https://www.steeda.com/steeda-555-4045-mustang-subframe-insert-bushings
IRS Subframe Replacement Bushings (Steeda P/N 555-4046)
Link: https://www.steeda.com/steeda-555-4046-mustang-subframe-replacement-bushings
I've also seen several threads mention an "IRS cradle lockout kit" although I didn't find one on Steeda's website, only on BMR's website. There are a lot of options that all seem to address the same issues. How do you choose which product is the best option?
Based on my previous experiences with basic GM G-body suspension mods I would just choose the IRS Subframe Replacement Bushings (Steeda P/N 555-4046) and call it done but I found several posts where people said the aftermarket polyurethane bushings were too hard and transferred rear-end noise into the car. I don't know if that's correct.
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