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D 17 final drives
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Honey B View Drop Down
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Joined: 28 Oct 2012
Location: Jasonville IN
Points: 48 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Honey B Quote  Post ReplyReply Direct Link To This Post Topic: D 17 final drives
    Posted: 11 Dec 2012 at 6:00pm
What is the difference between a series I and series IV?  I know the housing appears to be stronger, but is the pinion shaft and gears stronger?  Is series III and IV the same?  Can you interchange series I for series IV without changing side gears in the differential?  Thanks!   
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20523 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2012 at 8:48pm
WD-WD45-old D17's are 15 tooth bull pinion shaft driving an 82 tooth bull gear for 5.47 to 1 ratio. Effective with D17 series 3 (band and disc brakes) they are a 14 tooth bull pinion shaft driving a 76 tooth bull gear for 5.43 to 1 ratio. The newer design has thicker stronger teeth for more strength (less breakage). The gear ratios are essentially identical at 5.47 to 1 versus 5.43 to 1 for about a 2% difference. The newer bull pinion shaft is fine splines into the diff side gears instead of the old course splines.
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