Steeda S550 Mustang IRS Subframe Alignment Kit


We were lucky that our 5 in-house S550 Mustangs all came with the rear sub-frame aligned properly from the factory. But, what we noticed was a lot of people out there were not as lucky. The team here at Steeda went hard to work when we started fielding calls of the rear sub-frame being misaligned from the factory. So here you have it, Steeda®s new S550 IRS sub-frame alignment kit!

The S550's subframe mounting holes are very large compared to the subframe mounting bolts. Since there is a large difference in bolt and hole size, the subframe can be misaligned from the factory up to 1/2" left to right.

The Steeda S550 Mustang IRS Sub-frame Alignment Kit is made from CNC-machined Delrin to avoid putting two dissimilar metals next to each other, preventing corrosion. Delrin is also less weight than aluminium or steel inserts and therefore keeping performance in mind. The Delrin sleeves slide into the sub-frame mounting holes and fill the extra space left between the subframe mount and bolt from the factory.

Our Steeda S550 Mustang IRS Sub-frame Alignment Kit guarantees that the sub-frame will be bolted to the same location every time it is lowered. Eliminating the need for unnecessary alignments.

Note: An alignment is needed upon installation due to the fact it could have been misaligned from the factory and with it now being squared in the chassis, some adjustments might need to be made.

Product Benefits

  • Aligns subframe to chassis
  • No increase in NVH
  • Easy to install
  • No permanent modifications
  • Lifetime warranty
  • No additional hardware needed
  • Normally in stock in the UK
NOTE: If you use the BMR CB005 Kit you can choose our CB compatible Alignment kit


Part Number: 555 4438

Perfect to Install alongside our Springs and the Steeda S550 Mustang IRS Subframe Bushing Support System

Save on install by doing it all together with one alignment on everything after install and a rock solid fantastic set up is ready to go!

1. Store Orders General Information

All orders are subject to product availability. As U.K. stock of items increases, more and more products are available for delivery within 3 working days. However many items that we offer might only be available at the manufacturer and can take time to get in for you.

Wherever possible we aim to fulfil all orders within 15 working day's. In instances like this we will inform you and aim to keep you updated.

In extreme instances some products may be manufactured to order, in these instances delivery times can be over a month from the purchase date. We will contact you to let you know if this is the case before we place the order with the manufacturer.

In any case, please feel free to contact us for updates on your order once it is placed.

2. Services General Information

When booking services with us the booking date will reflect stock availability. In some cases we may require a deposit from you at the time of booking.

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