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Street Race Truck More... The Toolbox
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$98.71
$79.96
MSD 8739 Two Step Module Selector
MSD 8739 Two Step Module Selector

MSD 8739 Two Step Module Selector

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MSD 8739 Two Step Module Selector
MSD 8739 Two Step Module Selector
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We estimate this item will ship on or before December 24th.
Part # 5478739
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 5 business days for MSD to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.

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GTIN Code:
085132087396

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HolleyDAYS are here again! SAVE up to 20% on this part and hundreds of other Holley brands during the 2018 HolleyDAYS sale 11/15/18-12/31/18.

The MSD Module Selectors allow you to choose two or three dif­ferent rpm limits that can be activated at different times. With this ability, the possibilities are endless.As an example, well use a drag car with a Three Step Module Selec­tor plugged into the rpm socket of a 7AL-2 Ignition. The different rpm modules are activated when 12 volts are applied to a corresponding wire. By connecting one wire to the line-lock circuit, one module will be activated during the burnout. This helps keep tire temperatures consistent. When the line-lock button is released, the limit turns off. When youre on the starting line, you can activate the second limit through the clutch or trans switch. This provides a steady and consis­tent rpm for firm holeshots every time. When no modules are selected, the remaining high limit is active to protect the engine in the event of driveline failure. The Two Step works the same, but only with two different limits.The Module Selectors can also be used with an MSD Timing Control. By plugging the Selector into a retard module socket, you can acti­vate different retard amounts at select times. This is a great feature for engines being upgraded to a multi-stage nitrous system. With the addition of an RPM Activated Switch, you can use the Two Step to activate a shift light at different rpm.The Module Selectors must be used with an MSD Soft Touch Rev Control or a Timing Controller with a high-speed retard module. No rpm or retard modules are supplied.

Installation Instructions (PDF)

  • Allows a launch rev limiter and a high speed rev limiter
Some parts are not legal for use in California or other states with similar laws/regulations

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