This is the long underbody converter assembly for the 4.3 litre vans, measuring 46.5 inches overall with four sensor ports covering pre and post converter positions. Body and tubing are stainless steel over a ceramic substrate, and the outlet is a flange connection. It bolts in with no cutting or welding, and ships with two gaskets and a clamp plus inlet gasket and hardware. This is the federal EPA part.
Specifications
| Type | OEM-grade direct-fit catalytic converter (federal EPA) |
| Position | Secondary (underbody) |
| Material | Stainless steel body and tubing, ceramic substrate |
| Outlet | Flange |
| Overall Length | 46.5 in |
| Sensor Ports | 4 (pre and post converter) |
| Included | 2 gaskets, 1 clamp, inlet gasket and inlet hardware |
| Installation | Bolt-on direct fit, no cutting or welding |
| Series | OEM Grade |
| Finish | Stainless |
| Outlet Type | Flange |
| Tube Material | Stainless Steel |
| Clamps Included | Yes |
| Hangers Included | No |
| Legality | Not legal for sale or installation in California, Colorado or New York. |
| Part Number | 280429 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2023 | Chevrolet | Express 2500 | Base |
| 2021-2023 | Chevrolet | Express 2500 | LS |
| 2021-2023 | Chevrolet | Express 2500 | LT |
| 2021-2023 | Chevrolet | Express 3500 | Base |
| 2021-2023 | Chevrolet | Express 3500 | LS |
| 2021-2023 | Chevrolet | Express 3500 | LT |
| 2021-2023 | GMC | Savana 2500 | Base |
| 2021-2023 | GMC | Savana 2500 | LS |
| 2021-2023 | GMC | Savana 2500 | LT |
| 2021-2023 | GMC | Savana 3500 | Base |
| 2021-2023 | GMC | Savana 3500 | LS |
| 2021-2023 | GMC | Savana 3500 | LT |
Which vehicles does this fit?
- It fits the Chevrolet Express 2500 2021-2023, Chevrolet Express 3500 2021-2023, GMC Savana 2500 2021-2023, GMC Savana 3500 2021-2023. The full year, make, model and submodel list is in the fitment table on this page. This part is for the secondary (underbody) position.
What comes in the box?
- 2 gaskets, 1 clamp, inlet gasket and inlet hardware.
What does installation involve?
- Bolt-on direct fit, no cutting or welding.
Is it legal in my state?
- Not legal for sale or installation in California, Colorado or New York.
Shipping
- Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Special order items follow a lead time we confirm with you individually before the order is committed.
- Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
- Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
- Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
- Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
- Product images may be representative. The SKU and specifications in the listing are what ships.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Returns & Refunds · Warranty
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