2004 Buick Lesabre. Had a transmission flush and filter change.
04 Buick Lesabre shifts rough sometimes from 1st to 2nd feels like a slight shudder, been told need another transmission. Had it flushed,has helped some. Has 225 60r16 tires when door panel says 215 70r 15 tires. Some models came with the 225 option.
I was wondering does or can computer shift points need to be changed, I've heard with different tires computer needs to be reset or it throws shifts, speedometer and odometer off. The flushing showed no signs of debris in the pan. Was wondering does it need an additive or do some Buick just tend to have that noticeable shift, tends to do more if I push the gas harder than normal.
Answer: Hello and thank you for the tip / donation. The tire size concern would not have anything to do with this shifting, although it would be a good idea to have the reprogramming done. This would need to be done with a dealer scan tool.
There are a few possibilities for the shifting concern. First, since the flush seemed to help, i would suggest doing that again, but use the newest GM trans fluid - Dextron 6.
2006 BUICK LUCERNE CHECK ENGINE codes P0758 P0753 P2761. Question: REPAIRED WIRING TO AC CLUTCH THAT HAD BEEN RUBBING ON THE AC FREON LINE AND BROKEN. PROBLEM STARTED AFTER THE REPAIR I HAVE LOOKED AT THE WIRING HARNESS AND DO NOT SEE ANY CHAFFED AREAS. I CLEARED CODES.
PROBLEMS SHOWS UP AFTER ENGINE WARMS UP MAY BE 10 MINUTES OF DRIVING, WHEN CODES ARE CLEARED WHILE WARM PROBLEM COMES BACK. WHEN COLD IT DRIVE NORMAL UNTIL WARM. OIL LEVEL IN TRANS IS AT CORRECT LEVEL. I HAD THE CAR JACKED UP ON THE PASSENGER SIDE AT A 25 DEGREES WHILE FIXING AC WIRING AND STARTED CAR MAYBE DIRT MOVED IN TRANNY? WIRING DAMAGED.
Answer: I would check the transmission connector and terminals at the transmission. While you had the car jacked up and doing the other repairs, that may have stretched that transmission harness. Make sure the plug is tight. Wiggle the wires while the car is running to see if you can cause the problem.
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