So I have a 05 Impala SS an I just got done with a rebuild it spun a rod bearing cylinder #6 the engine only had 101000miles on its clock I bought the car from carmax in 09 ive owned it from 27,5xxmiles on the clock an im the second owner it come all stock not a mod on it ran perfect then around 80,xxxmiles the lim coolant elbows gave out so no big deal I replaced them an the second pair leaked so I put the aluminum lim gaskets an elbows of course then everything was fine until it spun a rod bearing at 101000miles right after i put on a front plog and rear ported stock manifold along with a 3" catless dp from zzp an it started knocking so I tore the motor down completely then found cylinder #6 rod bearings almost in pieces but still together the crankshaft was scourned all to hell along with the head im suprised #6 piston was not cracked, chipped, etc but I figured I did not catch the coolant leak my lim gaskets that failed looked horrible for cylinders 2,4,6 not a big suprise after thinking about it but my real question is with the rebuild the engine idles, cranks, boost, etc perfectly my aeroforce gauge shows -17.5-18.5 vacuum in drive and -19-20 in park which seems normally no vacuum leaks I even sprayed brake cleaner around all of my vacumm lines an what do you know no leaks not a misfire either. My mods are zzp stage 2 p&p heads, 105lb springs etc, plog, ported rear manifold, 3" catless dp, fwi, factory sc pulley, arp from bottom to top, clevite bearings mains & rods, new crankshaft, new l32 rods, new l67 pistons, everything for the rebuild oil pump, water pump, sensors, front & rear seals new timing chain and dampner . . . car runs fine sounds fine max psi is 6.5 which is low for the factory pulley but its a roots style blower so it boost higher numbers when theres more restriction so i know the m90 fine its brand new but thats not my concern everything seems fine no dtcs, etc but if I decide to take a left turn the engine slips out of gear the trans is filled with proper dextron etc when I replaced the trans filter and fluid before the rebuild the pan was clean along with the magnet when I drive around the trans is smooth under light and heavy throttle but left hand turns are out of the question it doesnt stall but it just jumps out of gear and if I want to take a right everthings fine no slip nothing just you going smooth through a right hand turn at any speed I want then the dreaded left hand turns just slip out of gear . . . any help