2005 TrailBlazer 4 high and 4 low problems

I recently had my four wheel checked cause it will not transfer in to 4 hi. But, it will transfer in to 4 lo Only for a little bit though then it turns off? The mechanic could not diagnose this as he said that the problem is somewhere between the modulator under the dash and the transfer case solenoid. He told me to take the solenoid to a Chevy dealer to diagnose exactly where the problem was. But, I could not as it costs too much at the moment. it has been two weeks with my solenoid disconnected.

I am now afoot as my trailblazer will not go into park and when i try to shift into park a horrible grinding/clicking noise occurs (what sounds like on the driver side). I have to use my E-brake to prevent the vehicle from rolling. I tried driving in 1st, 2nd, drive, and reverse the vehicle only revs when i press on the gas pedal. I tried getting the vehicle to drive in 4 wheel hi and lo but obviously the solenoid is not connected so that did not work. I don’t know what this may be. Is it the solenoid or is it the transmission. ps. no signs of transmission problems.

The only inkling of if or when of a transmission problem would be when shifted to drive. i would have to keep my foot on the brake until i knew the engine was fully in gear. I knew i had to do this cause I at times hear a soft thump or the vehicle wiggles or moves as if i can see the engine moving. what can the problem be?

ANSWER: You could have a problem in either the transfer case or the transmission. You describe the problem well, but there is quite a few things it could be. Having that solenoid disconnected should not have lead to any trans problems, but you never know. Unfortunately, this is probably going to be an expensive repair. I would highly recommend taking it to a Chevy Dealer for proper diagnosis. You don’t want other shop mechanics guessing at parts and costing you even more money.

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