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I had the exact same experience. I have a 98 24valve now.I put bigger injectors, exhaust and a quadzilla box in it, now it blows the V10 away. AND it still gets 13mpg, even towing an almost 15,000lb trailer!

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Hmmmm... maybe I need to look into a box for mine.
I've heard if I don't go too crazy with it mileage (and power [Tim Taylor voice] Ohhohhohh, more power... [/Tim Taylor voice] ) will increase but if I get too wild with it, it will puke the trans.


Tim

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The 48RE trans (03.5 to 07) will take a "little" abuse from mods. The 47RE or older RH for that matter, were a HUGE weak link. I smoked two stock torque converter in my 01 with a basic Edge EZ chip. I had a spare 47RE that I put $1400 into (triple disc converter, all new bearings and thrust washers, new input shaft, valve body kit, clutches/steels). I have 80k on that trans and it will hold my power level just fine....matter of fact I ended up putting some bigger injectors in it and that increased my mpg. The BIGGEST issue with these trucks are they are waayyy detuned in stock form so that the drivetrain will survive. Many people spend the $400-$600 for the "instant" hp/torque upgrade of a downloader that takes 5 minutes to install, but won't go the extra mile to insure that the trans has also been upgraded. That's a big reason that the transmissions got such a bad rap in these trucks.

....I'm waiting for someone that will make a stand alone trans controller for the 68RFE (six speed behind the 6.7 engine) so that I can look at sticking one in my 01.

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