12 Valve Engine and Drivetrain Talk about the 12V engine and drivetrain here. This is for 1994-1998.5 engine and drivetrain discussion only.

Does a gear swap affect the PCM?

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Old Dec 29, 2009 | 11:50 AM
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12V Mike's Avatar
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Does a gear swap affect the PCM?

I've got a chance to trade my 4.10 axles for a set of 3.55s. My truck is a '97 with an automatic. Would the PCM need to be reflashed due to the RPM change?
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Old Dec 30, 2009 | 09:28 PM
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From: Killeen, Tx
I think the only thing you need to do is get a different gear for the speed sensor. I'm not aware of any reflash option on our PCMs. FYI, the speed sensor is mounted on your transfer case.
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Old Dec 31, 2009 | 10:45 AM
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Cool. I just replaced the speed sensor and decided against the axle swap. Too many unknowns about the other axles.
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