Header Headache Help - Second-Gen Firebird Problem Solver
5 - Automatic Trans Anatomy
The vacuum modulator on an automatic transmission controls part-throttle up-shifts, and the original unit installed onto the Turbo 400 was much larger in diameter than some of those found on the smaller Turbo 350, so it may not be compatible with most headers. A common cure is to install a smaller Turbo 350-style modulator or an aftermarket adjustable unit and reroute its vacuum source accordingly.
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