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Allis D17 gearing

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=207756
Printed Date: 14 Aug 2025 at 1:18am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: Allis D17 gearing
Posted By: AintCheatnAintTryn
Subject: Allis D17 gearing
Date 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.

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who needs practical experience when you have a computer, a calculator and ideas? me.. dumb ideas get expensive fast.



Replies:
Posted By: Gatz in NE
Date Posted: 11 Aug 2025 at 7:15pm
check the post by Dr Allis

https://www.allischalmers.com/forum/wc-wd-wd45-wd45d-d17-d17d-gear-ratios_topic202581.html" rel="nofollow - https://www.allischalmers.com/forum/wc-wd-wd45-wd45d-d17-d17d-gear-ratios_topic202581.html


Posted By: AintCheatnAintTryn
Date 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

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who needs practical experience when you have a computer, a calculator and ideas? me.. dumb ideas get expensive fast.


Posted By: DrAllis
Date 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.


Posted By: HudCo
Date Posted: 11 Aug 2025 at 10:27pm
how much differance is the 170 175 ?


Posted By: WF owner
Date 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".


Posted By: DrAllis
Date 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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