4L80E Reference

OEM 4L80E-Direct-Drum 4L80E HD Direct Drum: Symptoms, Specs & Install

Name: 4L80E HD Direct Drum (OE# 4L80E-Direct-Drum)
SKU: 4L80E-Direct-Drum
Availability: InStock

If you searched for 4L80E-Direct-Drum, this is the part. 4L80E HD Direct Drum for the 4L80E. Below: failure symptoms, electrical specs, install procedure.

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What it does

Heavy-duty direct drum replacement. Resolves the known 4L80E direct drum cracking failure mode.

Fitment

1991-2013 GM HD trucks, vans, and motor homes with 4L80E or 4L85E.

Common failure symptoms

Cracked direct drum, no 4th gear, slipping under tow, metal in pan

Electrical / install specs

Forged steel HD replacement.
Required for any 4L80E rebuild on a tow truck or motor home.

Run a resistance check before condemning. Bad wiring, corroded harness pins, or a failing PCM driver can cause identical symptoms.

Replacement procedure

Transmission out of vehicle
Disassemble center planet section
Remove old direct drum
Inspect input shaft splines — replace if worn
Install HD direct drum
Use new sealing rings
Reassemble per spec
Refill with Dexron VI

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