Manufacturer communication — 2006 GMC YUKON DENALI XL

Fitment confirmedReporter type: ManufacturerPOWER TRAIN

Relation to the target vehicle

The source's vehicle field includes the trim.

Model year: Match 2006 — Source vehicle field
Model: Match YUKON DENALI XL — Source vehicle field
Trim: Match Denali — Source vehicle field

What the manufacturer’s document says

PIP3259J ・ fault and correction ・ names this vehicle

Applies to

Applies to 1999-2007 GMC Sierra and Yukon XL (among other listed GM trucks and vans) with the 4L80E (RPO MT1) or 4L85E (RPO MN8) transmission (note: the Yukon XL range runs to 2007).
the passage
1999-2007 GMC Sierra, Yukon XL with 4L80E (RPO MT1) or 4L85E (RPO MN8)

Fault

The 4L80E/4L85E automatic transmission may have a planetary gear whine noise in first and second gear, typically louder in first gear than in second.
the passage
The 4L80E/4L85E automatic transmission may experience a condition of planetary gear whine noise in first and second gear. The planetary gear noise is typically louder in first gear as compared to second.

Finding the cause

Steps to confirm (in the document’s order)

If the noise is judged abnormal and the transmission was built after 9-01-03, perform the Rear Unit End Play Check (SI Document ID # 52027).
the passage
If it is determined that a vehicle has an abnormal amount of noise and the transmission was built after 9-01-03, perform the Rear Unit End Play Check (SI Document ID # 52027).
The correct end play is between 0.127-0.508 mm (0.005-0.020 in).
the passage
The correct end play is between 0.127-0.508 mm (0.005-0.020 in).

Correction

Repair

If end play is out of specification, inspect and replace the output planetary gear set (661 - Output Carrier Assembly and 650 - Sun Gear) as necessary.
the passage
If end play is out of specification, inspect and replace the output planetary gear set (661 - Output Carrier Assembly and 650 - Sun Gear) as necessary.
Set the rear end play with the correct selective thrust washer (674), targeting between .010 and .015 in.
the passage
using correct selective thrust washer (674). Target between .010"-.015".
If end play is within specification, replace the transmission assembly, referring to bulletin 02-07-30-029A before ordering it.
the passage
If end play is within specification, replace the transmission assembly. Refer to bulletin 02-07-30-029A before ordering the transmission assembly.

Caution

This planetary gear whine can be characteristic of the 4L80E/4L85E; compare the vehicle with an identically built vehicle (same GVWR) before attempting any repairs.
the passage
This planetary gear whine noise can be characteristic of the 4L80E/4L85E. The vehicle should be compared to an identically built vehicle (same GVWR) for comparison before attempting any repairs.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

Communication summary
本予備情報通知は、1速・2速でプラネタリギアのホイーン音が発生する可能性のある車両について、技術者に情報を提供するものです。技術者は同じ車両との音を比較すべきです。技術者はトランスミッションの製造日を確認する必要があり、09/01/2003以降に製造された場合で、車両に異常な音量があると判断された場合は、リアユニットエンドプレイ点検を実施してください。エンドプレイが仕様外の場合は、出力プラネタリギアセットを交換してください。エンドプレイが仕様内の場合は、トランスミッションASSYを交換する必要があります。 Machine translation (unreviewed)
This Preliminary Information communication provides information to the technician about vehicles that may have a planetary gear whine noise in first and second gear. Technician should compare the noise to a like vehicle. Technician will need to check the build date of the transmission, if it was built after 09/01/2003 and it is determined that a vehicle has an abnormal amount of noise, perform the rear unit end play check. Technician will replace the output planetary gear set if end play is out of specification. The transmission assembly will need to be replaced if the end play is with in specification.
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Source

Source: NHTSA Manufacturer Communications
Source reference: 10112681
Received by source: 2017-08-15
Incident date: Unknown

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