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Go Rangers!!
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3,159 Posts
I just bought a 3815 off a member on here, and I updated it on the net and the update was a free "pack" it allows you to see all kinds of stuff and do a bunch of data logging, for example after the update you can see 0-40 0-60 0-70 0-80 0-100 times. You can see air intake temp, engine temp, fuel pressure, read your o2 sensors, do quarter mile times, and a bunch more shit.

There is no reason to get the 3865 for your truck, I have the exact same thing as you 2003 QC 4.7. Supposedly the 3865 has a bunch of new tranny tuning capabilities on it, what sux is we cant tune our trans, 4.7 trans is not able to be tuned until 2004.

That said I would def get the 3815, you can find them used for under $200. Well I did.
 
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