A/T - Harsh Light Throttle 1-2 Shift
TECHNICALBulletin No.: 09-07-30-017B
Date: April 29, 2011
Subject: 1-2 Shift Flare with an End Bump or Harsh 1-2 Shift at Light Throttle (Install New 1-2 Accumulator Valve Kit)
Models:
2003-2007 Cadillac Escalade
2003-2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003-2007 GMC Sierra, Yukon, Yukon XL
All Equipped with 4.8L or 5.3L Engine (RPOs LR4, LM7, L59, LM4, LH6, L33)
and 4L60E Automatic Transmission (RPO M30)
Please Refer to GWM/IVH
Supercede:
This bulletin is being revised to add a condition to the Subject and Condition Information. Please discard Corporate Bulletin Number 09-07-30-017A (Section 07 - Transmission/Transaxle).
Condition
Some customers may comment about a 1-2 shift flare with an end bump or a harsh 1-2 shift at light throttle.
Cause
This condition may be caused by the 2-4 band apply time extending through the 1-2 accumulator stroke.
Correction
1. Verify the customer's concern.
2. Remove the valve body. Refer to Valve Body and Pressure Switch Removal in SI.
3. Remove the coiled spring pin (360).
4. Remove the 1-2 accumulator valve sleeve (372).
5. Remove the 1-2 accumulator valve (371) and the 1-2 accumulator valve spring (370).
6. Install the new 1-2 accumulator valve kit, GM P/N 24255821.
7. Install the valve body. Refer to Valve Body and Pressure Switch Installation in SI.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer