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    I have taken a step into your world...

    I'm pretty sure the w4h0 is for 2.73 rear & u4p0 for 3.27. I have the w4h0 for my 65, it has 2.7. If I ever get the wiring done for the 95 & aode swap, I will use a modified u4p0 tune when I swap to 3.55