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School Me on the Big 'Uns

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CrestonM View Drop Down
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Joined: 08 Sep 2014
Location: Oklahoma
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 15 Sep 2018 at 11:39pm
I too have heard a similar story. I heard the 731 ci in the 4W-305 was a "detuned" 844 from the HD21. Makes you think they could have easily boosted the hp in future models, providing the drivetrain could hold up. 
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grinder220 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote grinder220 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2018 at 7:46am
The weak point in the 8550-4w305 is the dropbox input shaft, transmission main shaft and the coupler between the two. The splines wear down and eventually strip out from the sudden shock load of using the power director and the gear on the dropbox input shaft has the tendency to start chipping away also.
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