A/T - 2-3 or 3-2 Shift Clunk Information
TSB # IB07-05-S004Issue Date: JUNE 2007
Affected Vehicles:
2003-2008 Isuzu Ascender (US/UT)
2007-2008 Isuzu i-290/i-370 (TI) with 4L60-E Transmission
2006 Isuzu i-280/i-350 (TI) with 4L60-E Transmission
Service Information
This bulletin has been updated to include the 2007-2008 model year Ascender and pick-up.
IMPORTANT:
For 2005 model year vehicles, refer to SB05-05-S003 or newer.
Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.
During a 2-3 upshift the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft which can result in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be more apparent on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
This is a normal condition.
No repairs should be attempted.
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