Description
ARP | 5.9L 12 Valve – Cummins 14mm Main Studs
Fits: 89-98 (5.9L) 12-valve cummins trucks
These ARP main studs are made from 8740 chromoly steel and have a 200,000 psi tensile-strength rating.
They are precision centerless-ground and thread-rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance.
The kits come complete with hardened washers and high-strength hex nuts.
Please note – If your Engine has 2 factory oil drains you will need the 12mm Main Stud Kit
Shipped Australia-Wide
- Dispatched from within Australia with tracking.
- Same-day dispatch on in-stock orders placed before 11am AEST, Monday–Friday.
- Shipping is calculated at checkout based on size, weight and your delivery address.
- Estimated delivery 2–7 business days depending on your location.
Freight question? Call us on (07) 5619 7869.
ARP | 5.9L 12 Valve – Cummins 14mm Main Studs Fits: 89-98 (5.9L) 12-valve cummins trucks These ARP main studs are made from 8740 chromoly steel and have a 200,000 psi tensile-strength rating.
Double Duty Diesel — Manufacturer Pass-Through Warranty
Double Duty Diesel parts carry the original manufacturer's warranty:
- Fluidampr — Lifetime warranty on harmonic balancers
- MAHLE / Clevite — 12 months on bearings, gaskets, sealing components
- Dynomite Diesel — 12 months on stock-spec injectors and pumps; performance/race spec varies
- Power Driven Diesel — 12 months on turbos and bundled tuning kits
- Returns must be notified within 30 days of delivery
- Parts only — installation not covered
Workshop fitment available at Willys for transmissions, injectors and engine internals.
Read the full Double Duty Diesel warranty terms →
Warranty claims are coordinated through Willys Workshop. Email sales@willysworkshop.com.au or call Warana (07) 5619 7869 / Oxley (07) 3377 3421 with your order number and a description of the issue.