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Im running the ppe with a 225 hp tune, and when im at highway speeds and try to accelerate the trany slips then locks into 3rd. The trannys rated for 620 ftlbs of torque stock and the chip gives me supposedly 830 or so. Well do i need to rebuild the trans to hold the power or will a better torque converter do the trick?
 

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You need a better converter and stronger clutches. The stock tranny won't hold over a +90-100 tune safely
 

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At low speeds that tune won't give you issues but you better bump it down or get a built trans
 
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