Transmission · Automatic 8-speed · 5.3L
400-RL01243B Transmission interchange
400-RL01243B is a Redline transmission interchange code that fits 1 vehicle from 2021, option Automatic 8-speed · 5.3L.
INFERRED
Inferred: matched by vehicle specs. Likely right; confirm before you sell.
Fits
| Year | Make | Model | Option |
|---|---|---|---|
| 2021 | GMC | Sierra 1500 | Automatic 8-speed · 5.3L |
OEM numbers
How to verify
- Check the ID tag or transmission code against the OEM numbers above.
- Decode the VIN to confirm year, model and powertrain.
- Compare the part physically: mounts, connectors and dimensions.
Information is a guide only. Verify fitment before sale. No warranty is given.
Last updated 2026-10-03