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Power Strokes
6.4 Aftermarket
MCC / DIY Tuning for 6.4
Transmission line pressure
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[QUOTE="Kind, post: 1355435, member: 410"] I've been fighting shifting issues and didn't know why. I've been adjusting shift firmness tables but it only helped so much... It still never helped engaging the gears, predominantly the 3-4 shift. Anything over 30% throttle and it would just flair and never engage unless I let off. I have always been hesitant to adjust the line pressure tables because I had read that the shift firmness tables is what would help most and also read not to mess with the line pressure tables to much. But after seeing the maximum commanded pressure under the values tab set to 375 I figured I had room to tinker as the stock H&S trans tune was only commanding a little over 200 at full throttle. I asked Forrest what he sets his too and then felt more comfortable messing with the line pressures. I initially bumped all the gears up 20%. Noticed it helped... So I did the only reasonable thing to do, add more. I've always been a fan of how the old Spa*tan 6.4 files shifted and was looking more for that, especially with the way this truck builds power. I added another 20% on top of the 20% I already added and that was much better. So far I'm a lot happier with how it goes through the gears crisply and confidently. The roads up here are still very cold and slick so I haven't pushed to hard yet but it seems like these setting will work very well for me. Stock H&S line pressure tables [ATTACH=full]162872[/ATTACH] My 40% increase tables [ATTACH=full]162873[/ATTACH] [/QUOTE]
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