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Returns & Warranty Policy

At Black Stack Diesel, we want you to get the right part for your truck. Because we ship directly from our distribution partners, returns follow the process below. Please read it carefully before purchasing, and always contact us before sending anything back — returns without prior authorization cannot be processed.

Questions? Email help@black-stack-diesel.com.

How to Start a Return

All returns require prior authorization (an RMA). Packages sent back without authorization will be refused.

To request a return, email help@black-stack-diesel.com within 30 days of delivery and include:

• Your name
• Your order number
• The part number(s) you want to return
• The reason for the return
• For defective or incorrect items: clear photos of the product and the packaging/part-number label

We'll review your request and, if approved, send you return authorization and the correct return address.

What Can Be Returned

We accept returns on items that are defective, damaged on arrival, or shipped in error. To qualify, products must be:

• New, unused, and uninstalled
• Free of any signs of wear, damage, or installation
• In the original, undamaged manufacturer packaging

Opened, installed, or used products cannot be returned.

Because we are unable to accept buyer's-remorse or change-of-mind returns on most items, please double-check fitment, part numbers, and quantities before ordering. If you're unsure whether a part fits your truck, email us first — we're glad to help.

Items That Cannot Be Returned (Final Sale)

The following are final sale and cannot be returned or refunded, except where required by law:

• Programmers, tuners, and calibrators
• Electronic products (unless unopened and returned within 30 days, or received damaged/defective)
• Mounted tires or wheels (once a tire is mounted, the wheel is non-returnable — inspect wheels before mounting)
• Clearance, closeout, and scratch-and-dent items (sold as-is)
• Discontinued products
• Custom items and special orders
• Partial kits
• Apparel

Return Shipping

• You are responsible for return shipping costs unless the item was shipped in error or is defective.
• Original shipping charges are non-refundable unless the original shipment was incorrect or defective.
• Pack items securely in their original packaging — returns damaged due to inadequate packaging may be denied.
• Write your RMA number clearly on the shipping label and ship only to the address we provide.
• We strongly recommend keeping tracking and adding shipping insurance. We are not responsible for lost or carrier-damaged return shipments, and COD/collect returns will be refused.

Refunds

Once your authorized return is received and inspected:

• Approved returns are refunded to your original payment method.
• Please allow up to 10 business days after the item is received for inspection and processing. Your bank may take additional time to post the refund.

Wrong or Damaged Items

Inspect every shipment immediately on delivery. Report any incorrect items or shipping damage within 5 business days of delivery by emailing help@black-stack-diesel.com with photos of the product, the packaging, and the part-number label, along with your order number.

If we shipped the wrong item or it arrived damaged, we'll make it right at no return-shipping cost to you.

Warranty

Most parts we sell are covered by the manufacturer's warranty, not by Black Stack Diesel directly. If a product fails after installation, it may qualify for manufacturer warranty consideration — email help@black-stack-diesel.com and we'll help you start a claim.

Please understand that warranty coverage is provided by the manufacturer, and we cannot reimburse installation or labor costs, paint or prep work, towing or storage fees, vehicle downtime, lost wages, third-party expenses, or any incidental or consequential damages. Replacement parts under warranty may be billed initially, with credit issued once the manufacturer or carrier approves the claim.

Cores

Some products carry a core charge — a refundable deposit on a rebuildable part (the old unit you replace). To receive your core refund, the old core must be returned in accordance with the manufacturer's core-return requirements. Contact help@black-stack-diesel.com for core-return instructions specific to your part.

Questions