Pulling Forum - D 17 final drives

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D 17 final drives

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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=61440
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Topic: D 17 final drives

Posted By: Honey B
Subject: D 17 final drives
Date 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!

Replies:

Posted By: DrAllis
Date 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.