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Old 06-21-2011, 07:29 AM   #1 (permalink)
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Acceleration hesitation FIXED!!

So I bought my 07 3.5 LT in January, and quickly noted that i thought it accelerated kind of crappy when cold and at moderate acceleration. I did a TON of research and a lot of impala owners have this problem, along with a bunch of other GM cars. Most people on here said it was "normal". While it is common, it is not "normal"

Well, it ended up needing the second clutch pack and solenoid replaced. There is actually a bulletin in Alldata. When i took it to the dealer the mechanic couldnt duplicate what i was talking about. But the dealer was very helpull and offered to do the Bulletin fix anyways under warranty. Well, now it works perfect! Shifts more crisply and accelerate way quicker, no hesitation!!

Just thought i would share my story in case someone else is having this same problem.

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Old 06-28-2011, 03:43 PM   #2 (permalink)
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That's great!

My '08 with 3.9 is at the dealer for the same thing, they're having trouble finding what is wrong because there are "no codes". Had to take the tech for a ride instead of paying for another injector flush that they already tried.

Would love to get any additional info, like the alldata scoop. Can you post a link or document or something I can take to my dealer?

Thanks!

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Old 06-29-2011, 06:49 AM   #3 (permalink)
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Print the above post and take it. Dealer can check alldata.

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Old 12-21-2014, 04:40 PM   #4 (permalink)
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Quote:
Originally Posted by 07LT View Post
So I bought my 07 3.5 LT in January, and quickly noted that i thought it accelerated kind of crappy when cold and at moderate acceleration. I did a TON of research and a lot of impala owners have this problem, along with a bunch of other GM cars. Most people on here said it was "normal". While it is common, it is not "normal"

Well, it ended up needing the second clutch pack and solenoid replaced. There is actually a bulletin in Alldata. When i took it to the dealer the mechanic couldnt duplicate what i was talking about. But the dealer was very helpull and offered to do the Bulletin fix anyways under warranty. Well, now it works perfect! Shifts more crisply and accelerate way quicker, no hesitation!!

Just thought i would share my story in case someone else is having this same problem.
What is Alldata?

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Old 12-21-2014, 07:03 PM   #5 (permalink)
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Alldata is an aftermarket service informstion provider. The TSBs they have are all just from GM, any GM tech can access the TSB without needing Alldata.

Service Information Home Publications Number Search New Bulletins Bulletin Search Feedback Help
2007 Chevrolet Impala | Impala, Monte Carlo VIN W Service Manual | Document ID: 2838644
#06-07-30-023E: 4T65E Transmission 1-2 Shift Shudder at Light to Moderate Acceleration (Replace 2nd Clutch Plates and Sealing Rings) - (May 2, 2012)
Subject: 4T65E Transmission 1-2 Shift Shudder at Light to Moderate Acceleration (Replace 2nd Clutch Plates and Sealing Rings)

Models: 2001-2004 Buick Regal
2001-2005 Buick Century, LeSabre
2002-2007 Buick Rendezvous
2005-2007 Buick Terraza
2005-2008 Buick Allure (Canada Only)
2005-2009 Buick LaCrosse
2006-2011 Buick Lucerne
2001-2005 Chevrolet Venture
2001-2007 Chevrolet Monte Carlo
2001-2011 Chevrolet Impala
2005-2008 Chevrolet Uplander
2006-2007 Chevrolet Malibu SS, Malibu Maxx SS
2001-2002 Oldsmobile Intrigue
2001-2003 Oldsmobile Aurora
2001-2004 Oldsmobile Silhouette
2001-2005 Pontiac Aztek, Bonneville, Montana
2001-2008 Pontiac Grand Prix
2005-2008 Pontiac Montana SV6
2006-2008 Pontiac G6 GTP
2005-2007 Saturn Relay
Equipped with 4T65E Automatic Transmission (RPOs MN3, MN7, M15, M76)
This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 06-07-30-023D (Section 07 – Transmission/Transaxle).

Condition
Some customers may comment on a 1-2 shift shudder at light to moderate acceleration. Typically, the throttle plate angle parameter is 12-20% at time of condition with vehicle speed of approximately 24-40 km/h (15-25 mph). The customer may describe the condition as slip or delayed shift into second.

Correction
Replace the second clutch (5) steel plates (625) (24204104), (6) fiber plates (624) (24205361), and (2) oil sealing rings (613) (24209498). Refer to GM unit repair service manual for the year and model of the vehicle being serviced for the 2nd clutch service procedure.

Object ID: 1859782Click here for detailed picture of the image.

Object ID: 48711Click here for detailed picture of the image.
Additional parts needed to complete the repair - a Case Cover Lower Gasket (429) and a Case Cover Upper Gasket (430). These gaskets can be obtained by ordering gasket kit 24206391.

Disassemble ONLY the Oil Pump Assembly from the Case Cover (Complete). DO NOT disassemble the Control Valve Body from the Case Cover. Remove ONLY the Case Cover-to-Case bolts to remove the Case Cover and Valve Body from Transmission Case AS AN ASSEMBLY. To access all Case Cover-to-Case bolts, it is necessary to remove the Pressure Control Solenoid Valve Assembly (322), and 1-2 & 3-4 Shift Solenoid Valve Assemblies (315A, 315B).


Object ID: 1859781Click here for detailed picture of the image.
Important: This service kit does not contain the gaskets and/or seals necessary to service the Case Cover and Control Valve Body, if they are disassembled from each other. Please review the graphic above for Pump Body-to-Case (230), Pump Cover-to-Case (231), Control Valve Body-to-Case (377), Manual Shift Detent Assembly-to-Case (805), and Case Cover-to-Case (433, 434, 435, 436, 374, 379, 380, 384) bolt locations.

Notice: Failure to use all parts as instructed will cause improper function, and possible transmission distress.

Parts Information
Part Number
Description
Qty
24206391
Gasket Kit, Case Cover
1
24204104
Plate, 2nd Clutch-Steel
5
24205361
Plate, 2nd Clutch-Fiber
6
24209498
Seal, 2nd Clutch Housing Fluid Seal Ring
2
88861037 (1 qt – US)
19264717 (1 L – Canada)
DEXRON VI Auto Trans Fluid
10
Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time
K7531
Clutch, Second – Replace
Use Published Labor Operation Time
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

2014 General Motors. All rights reserved.

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