Wilwood's Forged Dynalite rear drag kit mounts a four-piston forged Dynalite caliper over a drilled rotor that rides on an aluminum hat, built for the Big Ford New Style rear axle flange. Compared with a stock rear setup, the kit's lightweight components include drilled .35" thick rotors, an aluminum hat, and forged Dynalite calipers, which cuts unsprung mass at the rear. Owners on user forums compare the stopping power favorably with larger performance setups, though they also note it is not built for hard track abuse.
Fitment is the first thing to check. The kit's spacing is designed for use with a 2.50" axle offset, and the manufacturer advises verifying your axle housing flange and axle offset before purchase. Big Ford housings with Olds-Pontiac flanges need a different kit, as the manufacturer's instructions point out. Search terms that match this part include big Ford new style 2.50 offset rear drag brake kit, Ford 9 inch drag brake kit drilled rotor, and forged Dynalite 4-piston rear caliper.
The manufacturer describes this kit as a direct bolt-on for the Big Ford New Style housing flange with a 2.50" axle offset, and lists Ford 9" rear ends among its applications. Because aftermarket housings sometimes use different flanges, the manufacturer advises confirming your flange and offset before ordering.
No. The manufacturer states the kit is not supplied with hydraulic lines or fittings, so you may need to buy additional lines, which Wilwood sells separately.
Yes. According to the manufacturer's assembly instructions for this Big Ford New Style kit family, the rotor and hat must sit flush against the axle flange, or excessive rotor runout may result.
The manufacturer states that this kit should only be installed by people experienced with disc brake systems, so this is a job for a confident DIYer or a shop. Start by verifying the flange and offset, then disassemble the original rear brakes. Use the manufacturer's sequence to fit the bracket and rotor, hold the assembly with lug nuts finger-tight, and torque to specification. Because no brake lines come with the kit, plan your hydraulic routing and fittings before you start. Verify that the hat seats flush to avoid runout, and bleed the system once plumbed.
