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Old 09-24-2013, 07:57 PM
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HemiLonestar HemiLonestar is offline
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You won't be able to trans tune that 99 at all. It will probably allow you to lift any rev or speed limiters, but that's about it. You'll have 87, 91 towing and 91 tunes (based on octane). 87 pulls timing, 91 is fun, 91 tow ups it a bit but doesn't advance the timing as much (IIRC). I get better mileage with the 91 tune than I did with the 87 (when I can keep my foot out of it).
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