1-2 Slip Bump Or Harsh Shift With Low Mileage - keywords hard rough
| Subject: | 1-2 Slip Bump or Harsh Shift With Low Mileage |
| Models: | 2007 Buick Rainier |
| 2007 Chevrolet Avalanche, Colorado, Express, Silverado, Silverado Classic, Suburban, Tahoe, Trailblazer |
| 2007 GMC Canyon, Envoy, Savana, Sierra, Sierra Classic, Yukon, Yukon Denali, Yukon XL |
| 2007 Hummer H2, H3 |
| 2007 Saab 9-7 |
| Equipped with, 4L60E (RPO M30), 4L65E (RPO M32) or 4L70E (RPO M70) Automatic Transmission |
THIS PI is being updated to add transmission models. Please discard PIP3989.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment on a 1-2 harsh shift or a slip bump on a 1-2 shift. These comments will typically occur on vehicles that have less than 100 miles.
Recommendation/Instructions:
Shift adapts have been given much greater capability. These adapts can greatly improve 1-2 upshift feel but need upshifts to work. Make sure the vehicle has at least 100 miles of varied driving conditions before attempting to evaluate the 1-2 upshifts.
If the harsh shifts continue after at least 100 miles of varied driving refer to the latest version of PIP3170 for possible causes of harsh 1-2 shifts. When inspecting the 1-2 accumulator assembly it is important to note that all transmission models use an inner spring (104) but many models do not use an outer spring (54). For the 2007 model year the following is a breakdown of spring usage by transmission broadcast code:
These models use 2 springs (104 & 56).
7CAD
7CBD
7KAD
7KZD
7SDD
7SFD
7SLD
7TDD
7TFD
7TFD
These models use 1 spring (104 - inner only)
7CFD
7CHD
7CJD
7CLD
7CMD
7CSD
7CVD
7CWD
7KCD
7KFD
7KLD
7KMD
7PCD
7PKD
7SBD
7SJD
7SKD
7SZD
The following models have two 1-2 accum springs
8CAD
8KAD
8SFD
8SLD
8TFD
8TLD
The following models have one 1-2 accum spring (inner only)
8CFD
8CJD
8CLD
8CVD
8KFD
8KLD
8SJD
8SKD
8SUD
8SWD
8TKD
8TWD
8TZD
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
