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Trailblazer 2007 ss on occasion the transmission slams into 1st and then seems to go right into 3rd, brought it to dealer but they cannot duplicate the problem so...
Re: Trailblazer 2007 ss on occasion the transmission...
It sounds like you have an intermitent shift solenoid failure.This is what would cause your failure. You may possibly have an electrical failure also. I hope this helps.
Thank You,
Roy
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No it would not ! you probably have a 2-3 Shift Solenoid (SS) problem !
You trailblazer has Vehicle Speed Sensor (VSS) located on the tail shaft of the trans . this sensor supply's info to the PCM for vehicle speed . Your trailblazer also has a Input Speed Sensor (ISS) if this were bad it would cause erratic shifts all gears ! Does your vehicle have a check engine light lit or any other type light like a yellow wrench or service vehicle soon ? Your best bet is to take it to AAMCO or some other ASE certified repair facility !
From what you are describing, it is possible either the 3-4 actuator is no longer playing with the 3rd & 4th clutch packs, only way to know for certain is to hook up the good ol' pressure gauge to trans. system, yeah, you think the Chevrolet dealer should know this right?
To disable the Traction Control and Stabilitrak depress and hold the button under the large engage button on the shifter. There may be an issue with the idle speed adjustment for operating with the TC/S enabled.
Best guess is that you have a leak in the transmission oil cooler which is located inside the radiator. It's forcing coolant into the transmission. If that's the case, it may have already damaged the transmission
the trailblazers have a issue with the fan clutch. it normally has to be replaced. ide take it to a dealership. its not a easy task to replace the fan clutch if thats the problem.
It is an internal trans problem. I build transmissions for a GM dealer. It is going to be the input carrier, forward sprag, and 3rd/4th clutches. I have seen several. Get it to your dealer. That truck has a 100,000 mile powertrain warranty. That includes the trans. Good Luck.
The 1st thing to do is have a test run on the transmission control module to see if any trouble codes are present, next have you ever serviced the transmission, fluid and filter change, should be done at 60,000 miles, on occasion this can cure problems like yours.
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