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Old 01-25-2011, 08:02 PM
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Better shifting Transmission with SCT X3?

I just got the x3 and I like the power, BUT the transmission shifts like crap. To much jerking for me. Not only was it the canned tune, but also the free Spartan tunes. I reduced the line pressure and still too hard for me. Is there a tuner out there that can make the SCT shift exactly like a Stock truck? I am not looking for power, only fuel mileage. The truck is all stock but a small lift and 315's, I also have all the gauges ready to go on the truck when it is tuned right. Matt.s SRL tune says it is the best shifting tune around. Is this right? Is there anyway to tune the motor without messing with the trans? Let me know thanks
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Old 01-25-2011, 08:27 PM
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Did you set the Revs per mile correctly to your size tires? What about the gear ratio? Did you give the tranny a chance to relearn?

If all of the above was set ok, you could try reading post #13 on down, from this link.
suncoast superduty rebuild? with a slight 2-3 shift flare - Page 2 - TheDieselGarage.com
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Old 01-26-2011, 03:53 PM
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the spartan tunes shifted hard on my truck too, i put matts tune on and it shifts 10 Times better, but like Lilpooh said make sure you put some miles on before you go out and beat the snot out of it or any tune will shift funny
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Old 01-26-2011, 09:01 PM
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I had the exact same problem. Look at my thread labled "Innovative Tunes" and read it.

The transmission is going to relearn itself or at least mine did. I had THE exact problem and hated it. I left one tune on and just drove and drove and drove. Tranny shifts like butter now and I love it.
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Old 01-27-2011, 06:51 AM
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My transmission would take along time making shift to 1-2 when cold ...sometimes damn near a city block @ 3000 rpm then it would shift or if I lifted slightly on the throttle it sometimes would help ...
Running my tunes from Vivian, this has disappeared on ALL tunes I have tried so far..
But I gave her , tire sizes , & axle ratio,etc... when she setup my tunes .... don't know if that made a factor ? .....but my sticking shift problem has gone away !
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