For the price of the trans pan, valve body, and separator plate gaskets, the firmness and quickness of GM Turbo 400 upshifts and downshifts can be dramatically improved, according to Darrell Young's ...
It's the 4L80E that’s become the go-to choice for backing a big-power/big-torque engine, and for good reason. With its roots in the TH400, which was used with GM’s biggest-torque big-block engines of ...
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