I finally realized that there was no Kickdown switch for the TH400 in the Blazer, so I got around to ordering one and putting it in. It makes a world of difference when you can stomp the gas, and the ole boy actually moves a bit quicker rather than just making more noise
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Pretty simple to install, just bolted it up to the accelerator bracket under the dash and run a hot wire into one spade and a wire from the other spade to the solenoid on the driver's side of the transmission right by the pan.