518 Vs 618 Guru's?
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a 46 wont take it if u make any power at all. the 47 has more clutches in the drums and i think more planet gears. also an old 518 wont have converter lock. also be aware of 47rh vs. 47re u MUST have a computer and associated wiring/sensors to use a 47re. the e makes is electronic regulated. the rh has a mechanical governor to control line pressure. the only thing it needs electricity for is to turn on OD and lockup.
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