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I will be following your results as I have the same transmission and have wondered where to find parts if mine fail.
Just to add to this thread in case anyone interested. I rebuilt my R151F and hated the 1st and 2nd gear ratios after swapping in a 3.4. I swapped in the gears from a R150F (3.0 V6 version) Direct swap.
Most parts are readily available, though from what I can find, I've got an older gearbox with the nut on the countershaft and this 2nd gear arrangement which is no longer in production.
I wonder if the 2nd gear from a AX15 works with the older style syncho/hub in a R151F.That gear has 33 teeth, same as the one in the R151 and the AX15 is pretty much an R series transmission.
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