Is it worth repairing or replacing the transmission on a 2020 GMC Sierra 3500?

As a general rule of thumb, a transmission replacement on a 2020 GMC Sierra 3500 (full-size truck segment, vehicle value roughly $14,935–$19,009) is usually worth it when the installed cost stays under about $7,637 — roughly 45% of what the vehicle is worth.

What years of GMC Sierra 3500 does a remanufactured or new transmission fit?

Based on vendor-verified fitment data across 83 listed transmissions, remanufactured and new transmissions for this model cover the 2001–2006 model years. Always confirm your exact VIN or engine/transmission code before ordering, since fitment can vary by submodel or engine.

2020 GMC Sierra 3500 Transmissions

Remanufactured transmissions that fit the 2020 GMC Sierra 3500. Each unit below is matched to this vehicle, warranty-backed, and shipped with freight quoted at checkout from Peak Powertrain.

Available Transmissions (10)

Remanufactured Transmission T6L90E6620T4A
Price
$2,625.00
Condition:
remanufactured
Remanufactured Transmission T6L90E6620T2
Price
$2,625.00
Condition:
remanufactured
OE + 6L90 Remanufactured Automatic Transmission
Price
$2,890.00
Engine:
6.6L
Condition:
remanufactured
OE + 6L90 Remanufactured Automatic Transmission

2020 GMC Sierra 3500 Transmissions

Available Transmissions (10)

Remanufactured Transmission T6L90E6620T4A

Remanufactured Transmission T6L90E6620T2

OE + 6L90 Remanufactured Automatic Transmission

OE + 6L90 Remanufactured Automatic Transmission

2020 GMC Sierra 3500 Transmission Market Context

Is replacing the transmission worth it?

Frequently Asked Questions

Remanufactured Transmission

Remanufactured Transmission

6L90 Remanufactured Automatic Transmission

6L90 Remanufactured Automatic Transmission

6L90 Remanufactured Automatic Transmission

6L90 Remanufactured Automatic Transmission

Other GMC Sierra 3500 Years