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Message: [QUOTE="SpartanDieselTech, post: 1282033, member: 22311"] I scorched the C35R and C456 clutch packs in my 15. Didn't break, persay, truck was still driving fine, but down on power. I've added appropriate apply and hold pressures for those clutches in the performance files that will go to production for the 15/16 trucks, but heavy abuse with +225 or more HP files will take its toll on those clutch packs over time. Edit to add- My 2015 F450 with 4.30 gears deals with the 4-5 upshift drasticallly better than my SRW 350 did with 3.55 gears and the same 600RWHP calibration. The additional gearing removed some load. You take a 3.55 geared truck, on bigger than 35" tires, and do some heavy boost launches at the track and/or repeated WOT runs resulting in a wide-open 4-5 upshift repeatedly, and the stock transmission is on borrowed time. This applies to anyone's tuning on the 2015/2016 trucks making mid-500 or more in power. [/QUOTE]

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