Transmission Assembly for 2025 GMC Sierra 3500

6-Month FREE Warranty Included:

We offer an industry leading 6 months / 6000 miles warranty on every part type we sell. All of our engines and transmissions carry a 6 months / 6000 miles warranty. Claims on engine warranties are limited to manufacturer defects in the pistons, heads, block, crankshafts, rockers, and oil pumps. Though additional parts and accessories may be attached upon purchase, coverage does not extend to sensors, switches, cables, electronics, belts, hoses, water pumps, or manifolds, nor damage caused through overheating or improper lubrication. All warranties are null and void if:

• The vehicle is converted from a private passenger use to commercial or fleet use, or is used for racing or other competition or off-road recreational purposes, or used for ride share or delivery.
• Failure is caused by abuse, misuse, or modifications.
• Failure is caused due to not following the OE's maintenance schedule.
• Failure is caused by using the part for any use other than what was intended or recommended by the manufacturer.
• The part fails or becomes defective due to the vehicle being involved in a collision.
• The part is installed or operated outside the United States.
• The installed heat tab center is melted or removed.
• The part is sold "as is" as indicated on the packing list or in a statement of terms on the website.

Fast Shipping Nationwide:

We offer FAST shipping on all orders to the U.S. continental 48 U.S. states. We can ship anywhere in the contiguous U.S. including residential and commercial addresses. We do not require a core charge or the return of the engine core. If you need a lift gate, we also offer it for free upon request at checkout. Our standard delivery time is 3-5 business days after processing your order, which takes 2 to 3 days for LTL items. Want it faster? Shop for items nearest you.

Canadian Orders:
Currently we do not ship to Canada. We can ship anywhere in the 48 continental US states.

Alaska/Hawaii/Puerto Rico orders:
Orders outside of the continental 48 states (Alaska, Hawaii, and Puerto Rico) may be subject to additional shipping charges for extra freight costs.

Can I change my shipping address after I placed my order?
We are limited on our ability to change a shipping address on an order. The only address change we can allow, is a change from residential to a commercial address (within the same geological area—35 miles or less). Once we receive your request, we will review the requested change, and either approve or disapprove. We have this policy in place to combat fraud on orders. If the shipping address change is after your order ships, a change of shipping address fee may apply and must be paid via credit card. We will send you a link for processing your payment.

Shipping LTL items to my house
We can ship LTL items (Engines, Transmissions, Rear Axles, Transfer Cases, and more) to both residential and commercial addresses. For most commercial deliveries, the carrier will simply show up during normal business hours to make delivery; however, they may call to schedule a delivery. For residential addresses, the carrier will call a day or 2 in advance to schedule a delivery. It is very important to schedule the delivery, as the carrier will not make a delivery without it. You will also need to make sure someone 18 or older is there to receive the order. Failure to schedule delivery with the carrier will result in your order being returned back to us. You will be issued a refund less the original freight charges and the cost to redirect back to our facility. Redirect fees usually start at $150.

Why is shipping so high on airbags?
Airbags are considered hazardous material by the US Department of Transportaion and require special and additional handling for safe shipment.

Refusing Delivery of an Order
If you refuse delivery from the carrier, the part will be returned back to one of our facilities. Once received, it will be processed and a partial refund issued. Your refund will be less the original freight and the return costs.

Why can’t I ship airbags to my New York Address
New York state law bans the installation of used airbags in vehicles; therefore, we cannot ship into the state of New York.
In addition to New York, we can't ship airbags to any address outside of the continental US.

Parts being sent back UPS, FedEx, or USPS

• When you are shipping the part back to us, you can use UPS, USPS, or FedEx.
• We would recommend insuring the part in case it gets damaged during transit back to us, as you’ll be responsible for paying for the replacement.
• Packaging your part
  • Use the original shipping box if it is still structurally whole and will protect the part in transit back to us.  If not, please use a new box.
  • Ensure there is enough packing material to protect the part.
  • Remove all other tracking labels attached to your shipment.  You can strike through them with a black marker or put blank labels over them. We’ll provide you with a shipping address and an RA #. Please ensure that the RA # is written on a separate piece of paper along with your order number and place it in the box. This helps our warehousing team identify the correct order for the part.
• If you are returning the part within 30 days of your original order date to get a full refund, you must make sure the part is shipped prior to the 31st day.
• Returns that are shipped between the 30th and 45th day will be accepted if it is shipped before the 46th day from your order date; however, there is a 20% restocking fee that will apply.
• Once you ship it, please provide the tracking number back to us at customerservice@allusedparts.com.  Include your order number in the email.

*Note: Some part types have shipping restrictions based on their size or fragile nature. We have different options to accommodate the shipment of these part types, and will work with you to find the best solution.

30-Day Money Back Guarantee:
You may return any item in its original condition for a full refund within 30 days of order date, less shipping charges. It typically takes us approximately 3-5 business days to process a credit back to your account and 2-3 business days for the credit to appear on your account.

Return & Cancellation Policy:
You can cancel your order before it has shipped. If your order hasn't shipped, we will cancel your order and issue a full refund. We cannot guarantee that we can stop every order from shipping. If we cannot stop the shipment then you will have to start a return order process. All returns and cancellations can be started at our Order Management page.

Replacement Policy:
Received a defective part? To start the replacement process, please visit our Order Management page.
It is company policy that we receive the original auto part back before sending you a replacement auto part. The original auto part must be returned using the provided shipping label. The shipping cost for both the original and the replacement auto part is a cost attributed to the shipper at hand. Note, if these auto parts are not shipped back within 30 days of the delivery date of the replacement part, the buyer's credit card is subject to a recharge for the initial cost of the original auto part (minus the initial shipping cost) If you have any questions about the shipping back of the original part, please contact our customer support from the Order Management page
If you would prefer, you can request a refund of your purchase, and we will arrange for the return of your part.

Terms:
All returns and cancellations may be subject to shipping charges, unless caused by our error or cancelled by the customer prior to shipping. All returns are to be processed through our Order Management page.

Disclaimer:
-Some of our units (used engine, transmission, axle, etc.) may come with wear parts and accessories but are not guaranteed in the sale. They will need to be replaced before installation. Common items that are not guaranteed include but not limited too nuts, bolts, links, seals, bushings, ball joints, brackets, bezels, wiring, cables, sensors and other applicable items depending on the part. If they are not serviceable, such as a pressed-in ball joint, they will be guaranteed.
-We cannot guarantee color on any part we sell. The purchased item may need to be repainted, refinished, or reupholstered for proper color match.

Packing your order for a return
To ensure a smooth and timely processing of your order upon its return to us, please follow these steps to prepare it for shipping. This will help prevent any potential issues during transit and expedite the processing of your order once received.

Parts being returned back via LTL (engines, transmissions, rear axles, etc.)

• We would recommend insuring the part in case it gets damaged during transit back to us, as you'll be responsible for paying for the replacement.
• Place the part on a pallet. If the pallet isn't included with the part, you can usually obtain one from a nearby big box store (hardware store, grocery store, flooring store, etc.)
• Attach the part to the pallet. When it was shipped, the part was securely fastened to the pallet using rope or straps. If you use ropes, ensure that the rope is tied tightly and won't shift or move on the pallet. If the part isn't properly secured or isn't on a pallet, the carrier may refuse to pick it up.
• We'll provide you with a shipping address and an RA #. Please ensure that the RA # is attached to the part so that our warehousing team can identify the correct order.
• If you are returning the part within 30 days of your original order date to get a full refund, you must make sure the part is shipped prior to the 31st day.
• Returns that are shipped between the 30th and 45th day will be accepted if it is shipped before the 46th day from your order date; however, there is a 20% restocking fee that will apply.
• Once you ship it, please provide the tracking number back to us at customerservice@allusedparts.com
• We don't recommend or endorse any carriers. Please research and choose the one that suits you best. Some of the major carriers in the US include FedEx Freight, Old Dominion, XPO Logistics, SAIA, Estes Express, and R & L. Additionally, there are Third-Party Logistics (3PL) providers that act as intermediaries between shippers and carriers. One such provider is Echo Logistics, and you can obtain a quote from them.

Parts being sent back UPS, FedEx, or USPS

• When you are shipping the part back to us, you can use UPS, USPS, or FedEx.
• We would recommend insuring the part in case it gets damaged during transit back to us, as you'll be responsible for paying for the replacement.
• Use the original shipping box if it is still structurally whole and will protect the part in transit back to us.
• We'll provide you with a shipping address and an RA #. Please ensure that the RA # is written on a separate piece of paper along with your order number and place it in the box. This helps our warehousing team identify the correct order for the part.
• If you are returning the part within 30 days of your original order date to get a full refund, you must make sure the part is shipped prior to the 31st day.
• Returns that are shipped between the 30th and 45th day will be accepted if it is shipped before the 46th day from your order date; however, there is a 20% restocking fee that will apply.
• Once you ship it, please provide the tracking number back to us at customerservice@allusedparts.com

Returns due to the part being damaged or the wrong part.
If we are covering the cost to ship the part back to us, you will need to follow the instructions above to get the part ready to ship back. You will not be required to pay for insurance on the part, as it will be covered by our account; however, it is your responsibility to properly pack the part.

Refusing Delivery of an Order:
If you refuse delivery from the carrier, the part will be returned back to one of our facilities. Once received, it will be processed and a partial refund issued. Your refund will be less the original freight and the return costs.