# Service bulletin 99027B

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 6089003
- Published by NHTSA: 2000\-01\-12
- Manufacturer's number: 99027B
- Manufacturer's date: 1999\-12\-01
- Replaces: 99027A
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES

## NHTSA's summary

GENERAL MOTORS HAS DECIDED THAT SOME VEHICLES MAY HAVE THE AUXILIARY TRANSMISSION OIL COOLER OMITTED. \*TT

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Transmission and driveline, Automatic transmission

## Vehicles listed

- 1999 CHEVROLET SILVERADO
- 1999 CHEVROLET SUBURBAN
- 1999 CHEVROLET TAHOE

## Other bulletins for the same vehicles and component

- [PIP3366C](/bulletins/10143757.md), 2018-08-20, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\); POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low \(4LO\) range. Dealers technician\&\#39;s are advised this condition should be deemed a normal characteristic of 4WD low operation.
- [PIP5346](/bulletins/10115081.md), 2017-08-15, Service bulletin: EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES; POWER TRAIN. This Preliminary Information communication provides information to the technician about cooler line fittings that come with the 4T65E General Motors remanufactured transmission may not be the same as Original equipment manufacturer quick connect verses inverted flare. Dealer will need to contact General Motors Technical Assistance Center for further assistance.
- [PIP5340A](/bulletins/10096073.md), 2017-03-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLE THAT AFTER A TRANSMISSION OR TORQUE CONVERTER REPLACEMENT THE VEHICLE MAY HAVE A HARSH 1\-2 UPSHIFT AND THE CHECK ENGINE LIGHT OR SERVICE ENGINE SOON INDICATOR IS ILLUMINATED. IF YOU HAVE DUPLICATED THE CUSTOMER’S CONCERN AND FOUND DIAGNOSTIC TROUBLE CODE P0894 OR P1870 SET IN THE TRANSMISSION CONTROL MODULE PLEASE CONTACT GENERAL MOTORS TECHNICAL ASSISTANCE CENTER.
- [030730056](/bulletins/10005566.md), 2004-03-04, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. 4L60\-E AUTOMATIC TRANSMISSION OIL PUMP FIRST AND SECOND DESIGN IDENTIFICATION. \*TT
- [3259C](/bulletins/10005514.md), 2004-03-02, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. 4L80E, 4L85E WHINE NOISE IN FIRST AND SECOND GEAR. \*TT
- [010730038B](/bulletins/10005162.md), 2004-02-10, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. THE SERVICE ENGINE SOON LAMP IS ILLUMINATED, NO 3RD AND 4TH GEAR, THE TRANSMISSION DOES NOT SHIFT CORRECTLY, THE TRANSMISSION FEELS LIKE IT SHIFTS TO NEUTRAL OR A LOSS OF DRIVE OCCURS. \*TT
- [020730024A](/bulletins/634999.md), 2002-10-11, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT. DIAGNOSIS OF CRACKED OR BROKEN TRANSMISSION CASE. \*TT 2006 AND PRIOR CARS AND LIGHT DUTY TRUCKS. \*TT
- [020417001A](/bulletins/634895.md), 2002-10-10, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. CONCERNS WITH LAUNCH SHUDDER / VIBRATION ON ACCELERATION. \*TT
- [010417001B](/bulletins/629551.md), 2002-04-02, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. SUBJECT REGARDING LAUNCH SHUDDER ON ACCELERATION \(INSTALL NEW ONE\-PIECE PROPELLER SHAFT\) \*JG
- [020417001](/bulletins/629369.md), 2002-04-02, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. SOME OWNERS OF C1500 SERIES EXTENDED CAB PICKUP MODELS MAY COMMENT ON A VIBRATION/LAUNCH SHUDDER WHEN ACCELERATING FROM A STOP. \*TT

JSON: [/v1/bulletins/6089003](/v1/bulletins/6089003)

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