Delica L400 Manual Hub Upgrade (Aisin FHM-002) — Install & Tips
Delica L400 manual hub upgrade using Aisin FHM-002 selectable hubs on a 1997 Mitsubishi Delica L400 (4M40 2.8 diesel). This walkthrough covers removal, fitment, and function checks — plus why manual hubs are a smart upgrade (less driveline drag, potential mpg gain, and reduced wear when unlocked).
What’s covered
Prep & safety (chock, jack stands; wheel-off optional)
Remove OEM drive flange: snap ring, cone washers, flange bolts
Clean/inspect splines & gasket surface
Light grease, install Aisin FHM-002 base, star-pattern torque (to service-manual spec)
Dial cap orientation (FREE/LOCK), cap screws, threadlocker
Function check in 2H/4H with hubs FREE/LOCK on stands
Post-install re-torque after first drive
Why manual hubs
Reduce front axle/diff rotation in 2H → less wear & potential fuel savings
Quieter cruising; can improve steering feel in some setups
Lock hubs before dirt/snow/water so 4WD is instant at the lever
Notes
Verify spline/count & vehicle compatibility before ordering (Delica L400/Pajero/Montero applications vary).
Use medium threadlocker and torque to factory spec.
Don’t run 4H with hubs left FREE unless you understand the limitations (front axle won’t be driven).
Chapters (edit to match)
0:00 Intro & parts overview (Aisin FHM-002)
0:35 Tools & prep
1:10 OEM flange removal (snap ring, cone washers)
2:40 Clean surfaces & spline check
3:15 Aisin base install & torque pattern
4:10 Dial cap orientation & fasteners
5:00 Function test (2H/4H, FREE vs LOCK)
5:50 Road notes & re-torque
Keywords: Mitsubishi Delica L400, 4M40, Aisin FHM-002, selectable hubs, freewheeling hubs, manual locking hubs, front hub install, Pajero/Montero hubs, 4x4, DIY, off-road maintenance