Fixing Speedo for 4.11's without messing up custom tune??
03-08-2008, 06:33 PM
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Fixing Speedo for 4.11's without messing up custom tune?? I've got a 93 TA with a 94 or 95 OBDII PCM so I should be able to correct for the 4.11's with a handheld programmer, hypertech etc, however the car was already dyno tuned for its current modifications and I don't want to screw with that. So my question is whats the cheapest device to change just the gear ratio and not affect anything else??
