The Advance Adapters 4L80E (2WD) to Atlas Adapter (SKU AS-0401) is a 4.25" adapter built specifically for the 2WD output shaft configuration of the GM 4L80E automatic transmission. That 2WD-specific fitment is the key detail here — this adapter is matched to that particular output shaft length, so confirming your 4L80E is set up as a 2WD-configuration unit is worth doing before ordering.
What's included:
- Adapter, 4L80E to D300 (51-0401)
- GM T400/4L80E Gasket (716510)
- Bolt, 10mm x 1.5 x 35mm SHCS 12.9 Zinc (720028)
- High Collar Lock Washer, 7/16" (724324)
This is a lean, purpose-built kit — adapter, gasket, and mounting hardware, sized specifically for the 2WD 4L80E output shaft length in a 4.25" adapter format.