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Allis D17 gearing
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AintCheatnAintTryn View Drop Down
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Joined: 27 Feb 2025
Location: pennsylvania
Points: 24 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AintCheatnAintTryn Quote  Post ReplyReply Direct Link To This Post Topic: Allis D17 gearing
    Posted: 11 Aug 2025 at 6:05pm
Does anybody know the difference in gearing between the different Allis d17s? I've heard that diesel 17s are geared lower than the gassers. I've also heard that the series 3 and 4 are different than the 1 and 2s. I can't find anything on the LP gas version.
who needs practical experience when you have a computer, a calculator and ideas? me.. dumb ideas get expensive fast.
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Gatz in NE View Drop Down
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Joined: 11 Sep 2009
Location: Lincoln, NE
Points: 1062 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gatz in NE Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2025 at 7:15pm
check the post by Dr Allis
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AintCheatnAintTryn View Drop Down
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Joined: 27 Feb 2025
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Points: 24 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AintCheatnAintTryn Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2025 at 9:11pm
Thank you, I tried to search but the site kept telling me I didn't have permission. That post answered most of my questions
who needs practical experience when you have a computer, a calculator and ideas? me.. dumb ideas get expensive fast.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22166 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2025 at 10:12pm
The difference in D-17 S1 and S2 versus the S3 and S4 was for durability. The ratio change of 1% is nothing. If one final was spun fast enough to do 100 MPH the other would only do 99 MPH.
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3951 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2025 at 10:27pm
how much differance is the 170 175 ?
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Joined: 12 May 2013
Location: Bombay NY
Points: 5059 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WF owner Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2025 at 5:38am
Originally posted by AintCheatnAintTryn AintCheatnAintTryn wrote:

Thank you, I tried to search but the site kept telling me I didn't have permission. That post answered most of my questions

The best way I have found to search the forum is to use Google and, in this case, search something like "Allis Chalmers Forum D-17 gear ratio".
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22166 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2025 at 6:34am
175-180-185 final drives are 5.85 to 1 ratio, about 7% SLOWER than any D-17 or 170.
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