I did some research, and looks like they are aware of it....there is a TSB out for it.....I'll copy and past below...Notice the First Paragraph...is that what you have?
A/T - Torque Converter Shudders
'07 - '08 Tundra (6 Speed ATM) November 30, 2007
TSB REVISION NOTICE
^ January 4, 2008: Production Change Information has been added. Previous versions of this TSB should be discarded. Introduction
Some customers may complain about an intermittent shudder when lightly accelerating after an upshift between 20 - 45 mph (32 - 72 km/h) or before a downshift between 30 - 65 mph (48 - 104 km/h) when the torque converter
assembly is in flex lockup. Production changes to the torque converter have been implemented to improve this condition. Refer to the diagnostic instructions below to confirm if the torque converter needs to be replaced. Applicable Vehicles
^ 2007 - 2008 model year Tundra vehicles equipped with 6 speed automatic transmission (5.7 L V8 engine) and produced BEFORE the Production Change Effective VINs shown below.
Production Change Information
This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date. * Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Required Tools & Equipment
1. Connect Techstream to the vehicle and perform Health Check. Confirm NO DTC(s) are stored in the ECM (SAE term: Powertrain Control Module/PCM). Are there any DTC(s) present in the ECM (PCM)?
^ If YES - This TSB does NOT apply. Refer to the Technical Information System (TIS) and diagnose DTC(s). ^ If NO - Go to Step 2. 2. Test drive the vehicle and confirm customer complaint of shudder. 3. Use Techstream to take a snapshot when shudder is occurring to confirm if shudder is occurring during flex lockup. Configure snapshot as follows:
30 Second Duration
Trigger Point at Midpoint NOTE
:Refer to the University of Toyota online training class P901C "Techstream InDepth" for information about taking snapshots and graphing snapshots on Techstream.
4. Use Data List and the graphing functions of Snapshot to confirm the following data parameters when the shudder condition occurs: ^ Vehicle Speed ^ Shift Status ^ Lock Up ^ Lock Up Solenoid Status ^ SLU Solenoid Status ^ If the shudder occurs with Lock Up "ON", Lockup Solenoid Status "OFF", and SLU Solenoid Status "OFF", then the shudder is related to torque converter
flex lockup. Go to step 5. ^ If the shudder occurs with Lock Up "OFF", Lock Up Solenoid Status "OFF", and SLU Solenoid Status "OFF", then the condition is NOT related to torque converter
flex lockup and this TSB DOES NOT APPLY Continue diagnosis to identify the root cause for this shudder. 5. Replace the torque converter
. Refer to TIS, 2007 or 2008 model year Tundra Repair Manual:
^ 2WD transmission: ^ Drivetrain - Automatic Transmission/Transaxle
- "AB60EAutomatic Transmission: Automatic Transmission Assembly: Removal" ^ Drivetrain - Automatic Transmission/Transaxle
- "AB60EAutomatic Transmission: Automatic Transmission Assembly: Installation" ^ 4WD transmission: ^ Drivetrain - Automatic Transmission/Transaxle
- "AB60FAutomatic Transmission: Automatic Transmission Assembly: Removal" ^ Drivetrain - Automatic Transmission/Transaxle
- "AB60FAutomatic Transmission: Automatic Transmission Assembly: Installation" 6. Adjust the transmission fluid level in the transmission. Refer to TSB No. TC009-07, "Transmission Fluid Level", to properly adjust the transmission fluid level.
NOTE :Failure to use WS transmission fluid and to properly adjust transmission fluid level can cause transmission shifting issues, M.I.L. "ON", and/or transmission damage. 7. Test drive the vehicle and confirm the shudder condition is eliminated.