Then you should do the governor pressure solenoid and transducer like Cerberusiam suggested or do that plus a recalibrated valve body from somebody like Suncoast or a shift kit with a through cleaning of the VB.
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'04 2500 4x4 Regular Cab Laramie, HO 305 w/48RE and 3.73 gears, Smarty and TST stack, FASS, aFe Stage 2 intake, HTB2 62/65-13, ATS IC, CFM Plus, full 4" exhaust, DIY full billet trans, Suncoast V/B, ATS TQ + Co Pilot, Weld wheels w/ 35" Toyo AT. 511 HP, 984 TQ, 13.635 ET @ 99.44 mph.
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