Quick Answer
Replace the plastic third member on your F10 or H10 axle with the Vanquish aluminum version for added strength and rigidity. Follow these steps to avoid stripping threads or misaligning the ring and pinion.
Why Upgrade to Aluminum?
The stock plastic third member on F10 and H10 axles can flex under load, especially with larger tires or a heavy rig. The Vanquish aluminum third member eliminates that flex, keeping the ring and pinion meshed correctly for longer gear life and more consistent power delivery.
It also includes machined aluminum bearing retainers that add rigidity to the axle housing. While the swap is straightforward, you need to pay attention to bearing fit and fastener torque to avoid damaging the new parts.
Installation Steps
- Disassemble the Axle: Remove the wheels and tires, then pull the axle shafts. Unbolt the plastic third member from the housing. Carefully remove the ring and pinion as a set, noting the shim placement on the pinion. Keep shims organized by position — mixing them up changes gear mesh and can cause noise or binding.
- Transfer Bearings and Gear Set: Press the ring gear onto the aluminum third member using the original bolts and thread locker. Install the pinion bearings into the new aluminum bearing retainers, then slide the pinion into the housing. Use a bearing press or a socket that matches the outer race — hammering the bearings can brinell the races and cause premature wear.
- Install the Third Member into the Axle Housing: Place the assembled third member into the axle housing. Align the bolt holes and thread the supplied bolts in by hand before tightening in a cross pattern to 15-20 in-lbs (1.7-2.3 Nm). Do not overtighten — aluminum threads strip easily. Use a torque wrench if available.
- Check Gear Mesh and Rotate Freely: Rotate the input yoke by hand. The driveline should spin smoothly without binding. If you feel roughness, the shim stack may need adjustment. A slight resistance is normal for new gears, but any tight spot means you need to re-shim the pinion depth.
- Reinstall Axle Shafts and Final Assembly: Slide the axle shafts back into the housing, install the C-clips or retainers, and secure the axle covers. Reinstall wheels and tires. Before running the truck, turn the wheels by hand to confirm the axle shafts do not bind against the new third member.
Product Used in This Guide
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F10/H10 Aluminum Front Axle Third Member: The Vanquish Products F10/H10 third member is a direct replacement for the rear plastic third member used in all F10 and H10 axles. It is compatible with plastic and aluminum housings and includes machined aluminum bearing retainers. You get a drop-in upgrade that strengthens the axle center section without modifying other components, and the included bearing retainers prevent the ring gear from shifting under load.
F10/H10 Aluminum Front Axle Third Member
