Ultimate IRS - Mazda RX-7 FD3S Tubular Subframe Cradle

This is a complete bolt-in rear tubular subframe for the 1993-1995 Mazda RX-7 (FD3S) chassis. This is 100% chromoly, so it is not only lightweight but extremely strong. The bare stock stamped steel subframe is around 30 lbs, this bare subframe is 12 lbs heavier, weighing it at only 42 lbs. This small 12 pound weight gain is a small price to pay for the increase in chassis stability and strength. The stock subframes have been known to tear, especially when upgrading to an 8.8 rear end and welding in bars.

This is available for use with Stock differential, Ford 8.8" differential, and Ford 9" as well. No matter what differential you chose the OEM control arm pickup points will still be in the factory locations. For guys who already have an 8.8 rear end, this subframe will work with existing Ronin 8.8 kits. So if you already have the Ronin kit, you can direct swap out this subframe for your stock modified one. You can then sell your modded 8.8 subframe and recoup some of the costs. If you have one of my first FD3S 9" rear kits, this setup will also work with that as well.

This will make the entire IRS suspension more rigid. Removing the play and twist from IRS suspension systems is key in making it work better.

The subframe cradle uses all the factory mounting locations to the chassis and  stock locations for all suspension arms. This is also designed to work with the factory spindle. You can use all factory control arms other than the lower control arm (that has the eccentric bolt) - this subframe does not use the eccentric bolts, so you will need to have an adjustable arm there to adjust camber.

For the differential, it also uses the stock mounting locations, so you can use stock differential or an aftermarket rear end kit like my 8.8" or 9" kit. For example, you can see my FD3S 9" kit in the pictures.

BARE $4650
SATIN BLACK $4850
CUSTOM COLOR $4950