How Can We Help?

Use our OEM Cross-Reference tool — enter the number stamped on the part or box and we'll match it to the exact JAK'S part. If it doesn't return an instant match, call or text (720) 445-6249 and a specialist will cross it by hand.

All major credit cards, plus Shop Pay, Apple Pay and Google Pay at checkout. Approved trade/fleet accounts can buy on net terms — ask about opening a fleet account for volume pricing.

Yes. Shops and fleets get dedicated pricing and a direct line to a specialist. Contact us to set up an account.

Yes — pay monthly with Shop Pay Installments on eligible orders. The available options show on the product page and at checkout.

In-stock parts ordered by 3:00 PM MT on a business day ship the same day. Built-to-order items (like performance heads) ship after the build. Full details on our Shipping Policy page.

Orders over $1,000 shipping to the lower 48 get free standard ground freight, applied automatically at checkout. Expedited and air upgrades are billed at cost.

Sign in and open Track Order to see live status and carrier tracking for every order. You'll also get a tracking email as soon as it ships.

Note the damage on the delivery receipt before signing, photograph it, and report it within 5 business days. We file the carrier claim and ship a replacement — see Shipping Damage & Claims.

A refundable deposit on parts built around a rebuildable core. Send your old, drained, matching casting back within 60 days and we refund the core charge. Details on our Core Charge Policy.

Most new, uninstalled parts can be returned within 30 days with an RMA. Call or text us for an RMA number, then ship it back. See the full Returns & Refund Policy.

Built-to-order heads (Stage 3 / Stage 6) are non-returnable once machining starts, but defects are always covered under warranty. Not sure which stage fits? Call a builder first.

The Cross-Reference tool shows compatible engines for any number. For a final check, text a photo of your part tag to (720) 445-6249 and we'll confirm fitment by hand. Engine serial number (ESN) matters on kits and heads.

We cover Caterpillar, Cummins, Detroit, Mack/Volvo, Paccar and International. Shop by engine or cross a number to confirm.

PAI Industries parts carry a 2-year, unlimited-mileage warranty (3 years on the High-Performance tier). JAK'S Performance heads carry our own workmanship warranty. Full terms are on the Warranty & Returns page.

Call or text (720) 445-6249 with the part or serial number. We work the claim with the manufacturer for you — approved claims ship a replacement fast.

Always. You're talking to experienced diesel techs, not order-takers — before and after you buy. Reach out anytime.