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ATS Install Kit Allison Conversion Replaces 4 Wheel Drive Aisin AS69RC 2019+ clutch kits dual Perrin 15 17 Subaru WRX Super FGXX 668603 Perrin 15 17 Subaru WRX Super Shifter Stop (w PERRIN Short Throw Shifter) Dyno proven gains up to +5 HP and +4 lb ft of torque The first three gears of the 48RE are spaced evenly while the 4th gear is a massive jump into overdrive The lock up torque converter was added as an afterthought to the already outdated low line pressure transmission making it difficult to control the application of the converter clutch providing unpleasant TCC shifts
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