Wilwood Hub-Vented Rotor 69-70 Impala Drum /Dsc 5x4.50/4.75
Converting a 1969 or 1970 Chevrolet Impala from front drums to disc brakes, or upgrading an older disc swap to a bigger vented rotor, starts with the hub. Wilwood part 270-12038 is the forged billet aluminum front hub Wilwood machines for the Impala drum spindle, and it is what the rotor adapter and vented rotor bolt to. If you are searching for a lighter front hub that keeps your factory spindle and lets you run modern brakes behind 16 or 17 inch wheels, this is that part.
On the factory car, the hub and brake drum (or hub and rotor on disc cars) are heavy iron pieces. In a Wilwood conversion the hub is a separate aluminum part that rides on tapered wheel bearings on the stock spindle, carries the wheel studs, and holds an intermediate adapter plate that the rotor bolts to. Wilwood designs this hub for vented rotors 0.81 inch thick on an adapter plate, and it can also take Wilwood aluminum rotor hats for custom builds. Because the rotor is no longer cast into the hub, you can change rotor diameter later without changing the hub.
The hub is forged from billet alloy and then CNC machined so the bearing bores and flange run true on the spindle. It is double drilled for both 5 on 4.50 inch and 5 on 4.75 inch lug patterns, which matters on an Impala build where owners often switch to Ford-pattern aftermarket wheels or keep the GM pattern. The listed weight is about 3.1 lb, much lighter than the OE iron parts it replaces.
The 1969-70 Impala was built with both drum and disc front brakes, and the spindles differ. This hub is listed for the drum spindle on 1969-70 cars; distributor data also shows the same part number used on 1968-70 Impala disc spindles and 1969-82 Corvette in Wilwood kits. Pull a wheel and check whether you have a drum backing plate or a caliper bracket, and measure the spindle bearing journals if the car has been swapped before. If you are rebuilding the drivetrain too, our Turbo 350 identification guide helps you confirm which automatic is behind the engine.
Listed fitment: Chevrolet Impala 1969-1970, drum spindle, 5x4.50 and 5x4.75 lug patterns. This is the hub only. Wilwood sells it as the hub for its Impala front kits, where the complete kit adds the caliper, bracket, rotor, adapter and bolt kits, along with 1/2-20 Grade 8 studs, bearings and grease seals. Sold alone, the hub comes with its bearing races and a screw-on aluminum dust cap; plan on supplying the bearings, seal and wheel studs your build calls for, and match them to the races installed. If you are unsure about a modified car, send us the year and VIN and what is on the spindle now. Classic GM drivetrain parts for the same era are under TH350 and TH400.
If the old drums are rusted to the hubs, the 8.5-ton hub, drum and rotor puller pulls them without beating on the spindle. New hard lines for a disc swap are easy to make with a brake and transmission line flaring kit, and a Mityvac vacuum and pressure kit handles one-person brake bleeding.
| Brand | Wilwood |
| Part number | 270-12038 |
| Fits | Wilwood Hub-Vented Rotor 69-70 Impala Drum /Dsc 5x4.50/4.75 |
| Vehicle fitment | Chevrolet Impala (1969-1970) |
| Type | Wheel Hubs |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
It is listed for the 1969-70 drum spindle. Distributor data also lists the same part number for 1968-70 Impala disc spindles and 1969-82 Corvette in Wilwood kits, but check your spindle and bearing journals before ordering, or send us the year, VIN and what brakes are on it now.
The hub comes with bearing races and a screw-on aluminum cap. Wilwood's complete front kits add bearings, seals and 1/2-20 Grade 8 studs; when you buy the hub by itself, plan to supply those parts to match the installed races.
It is built for a vented rotor 0.81 inch thick bolted to an intermediate adapter plate, or for a Wilwood aluminum rotor hat on custom builds. Rotor diameter is set by the adapter and caliper bracket in the kit you pair it with.
Yes. The flange is double drilled for both 5 on 4.50 inch and 5 on 4.75 inch, so you choose the pattern when you install the studs.
Use a high-temperature wheel bearing grease rated for disc brakes, pack the bearings fully, fit a new seal, and set preload to just-free. Recheck the spindle nut after the first drive.
