3
verified units in stock
2020 Used Chevy Silverado 2500 Transmissions For Sale
Three verified 2020 Chevy Silverado 2500 transmissions are on the shelf today. Every one of them sits behind a 6.6L and every one is an automatic — but two are gasoline trucks and one is a diesel, and that single word is the difference between the right gearbox and an expensive mistake. Each unit is VIN-matched to your truck, shift-tested under load by ASE-certified technicians and photographed before it ships, backed by up to a 3-year warranty and 30-day money-back. Free freight, all fifty states.
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Shift-Tested & Verified
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Free Nationwide Shipping
2020 Silverado 2500 Transmission Fitments In Stock
All 3 in-stock 2020 Silverado 2500 transmission fitments, one card per build. Displacement will not sort this page for you — all three are 6.6L. What sorts it is fuel and drivetrain. Read the cards, then let the VIN confirm it at the order step.
Running a diesel 4x2? We hold the gasoline truck both ways but the diesel only in four-wheel drive today — text us the VIN and we will source it rather than sell you the wrong box. Need a different part for the same truck? 2020 Chevy Silverado 2500 engines are stocked separately, or step back up to all 2020 Chevy transmissions.
Why Buy a 2020 Chevy Silverado 2500 Transmission from Auto Power Source
Every gearbox on this page came out of a low-mileage 2020 Silverado 2500 donor, was logged against that truck's VIN the day it landed, and has waited indoors in a climate-controlled warehouse rather than out in the weather. None has been rebuilt or reshelled — it is original Chevy hardware. Before any unit is listed, our ASE-certified technicians take it through its full gear range and then put it on the road with weight behind it. On a three-quarter-ton truck that last part is not a formality: these transmissions spend their lives towing, and a unit that feels fine empty can still be finished.
The Silverado 2500 is the one truck on the 2020 Chevy shelf where the displacement tells you nothing. All three of our units are 6.6L — so a customer who reads the badge, checks the litres and stops there has narrowed three options down to three. The fork that actually matters is fuel: two of these trucks burn gasoline, one burns diesel, and they do not share a gearbox. Then drivetrain splits it again. We hold gasoline in 4x2 and 4x4, and diesel in 4x4 only. Text us the VIN and we will tell you exactly which of the three you need — or tell you straight that yours is one we need to source.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 2020 Silverado 2500 Transmission Options: Compared
When the transmission lets go on a 2020 Silverado 2500, there are four ways forward. The honest version:
← Swipe sideways to see all columns →
| Option |
Cost |
Reliability |
Warranty |
Fitment Match |
| Used OEM (this collection) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ 2-4× more |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM is where the value lands — factory hardware with a real warranty behind it, and none of the dealer markup on a new-in-box unit.
2020 Silverado 2500 Transmission Buying Guide
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Settle fuel before anything else. Gasoline or diesel is the first cut on this truck, and it is the whole ball game. Both of our engines are 6.6L, so litres will not separate them — on most other 2020 Chevys displacement does that job, and here it does not.
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Then settle 4x2 versus 4x4. We stock the gasoline truck both ways and the diesel in four-wheel drive only. A 4x2 and a 4x4 unit differ at the output and the transfer interface — they are different parts however well the engine matches.
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On the diesel, order off the option code. Our diesel listing carries opt MGM and ID OMKF. Heavy-duty trucks were built to order and the codes are what confirm the match — not the trim, and not the year on the title.
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Take the towing history seriously. Three-quarter-ton trucks earn their living under load, so mileage alone understates the wear. It is the reason we road-test every unit with weight behind it rather than just cycling it on the bench.
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Ask us for the donor VIN. We release it on request for any Silverado 2500 transmission in stock, so you can check the mileage and history yourself rather than taking our word for it.
Our ASE-certified technicians verify every one of these points against your VIN before any transmission ships.
📞 Not sure whether your 2500 left the line gasoline or diesel? Talk to our team live, 24h Mon-Sat.Call 1-877-313-8995
Frequently Asked Questions
What is the warranty on a 2020 Silverado 2500 transmission?
Up to 3 years, depending on the specific unit. The exact term is shown on each product page.
What does shift-tested mean?
ASE-certified technicians run the unit through its full gear range under load and check for slip, flare and harsh engagement before it is cleared for sale.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent before payment.
Do I need my VIN?
On this truck, effectively yes. All three units are 6.6L, so displacement cannot separate them — the VIN is what settles gasoline versus diesel and 4x2 versus 4x4.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
Why is this cheaper than a dealer replacement?
It is used OEM out of a low-mileage donor Silverado 2500 — the same Chevy engineering, minus the new-part markup.
When can I reach customer service?
24 hours a day, Monday through Saturday.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
No 2020 Silverado 2500 transmission is offered for sale until it has cleared all six:
1. VIN-MatchingWe read your VIN to settle the two facts that decide this truck: whether it burns gasoline or diesel, and whether it drives two wheels or four.
2. Tested & VerifiedASE-certified technicians shift-test the unit through its full gear range, watching for slip, flare and harsh engagement.
3. Shift & Road VerificationDriven with weight behind it. On a three-quarter-ton truck this step earns its keep — a tired converter will idle quietly all day and only confess under load.
4. Visual InspectionCase, bellhousing, pan, cooler lines, harness connectors and every mounting point go under the light.
5. Photograph & CatalogMulti-angle photos reach your inbox BEFORE the freight is booked. Your approval is what moves the pallet.
6. Palletize & ShipStrapped to a heavy-duty wooden pallet and freighted to your door at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the car the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 2020 Silverado 2500 transmission leaves our warehouse, we send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. That sits on top of 30-day money-back and up to a 3-year warranty.
✉ Email Us at info@autopowersource.com
