Did an XC/351/SR last week. Fitted great, but I would not bother with the XF/EA box. A modified V8 box would be a better bet. (stronger/ better ratios)
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If you're not driving a manual you're really just steering.
take a 5 speed out of an EF/EL XR8 or an EF/EL V8 and fit it it would be fine for the power the XF T5's arnt recommended behind much power either that or use a 4 speed toploader they will handle like 600 hp
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