Model B final drive question.
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=205435
Printed Date: 27 Jul 2025 at 4:42pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Model B final drive question.
Posted By: Tcfcowboy
Subject: Model B final drive question.
Date Posted: 13 Feb 2025 at 7:30pm
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I have a 1938 B that I m currently restoring, the right final drive is cracked around the drawbar. Would final drive from a 1940 B work. The reason I ask is, someone told me the early models had a different final drive, however they look the same to me.
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Replies:
Posted By: steve(ill)
Date Posted: 13 Feb 2025 at 7:56pm
Should interchange fine... Some have said the gear ratio is slightly different.. I can not confirm that... The housing would definitely be the same... The draw bar mounting holes on the earlier tractors were 1/2 inch i believe, and the later were 5/8 inch.
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Like them all, but love the "B"s.
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Posted By: wjohn
Date Posted: 13 Feb 2025 at 8:15pm
I have heard that there were some different final ratios over the course of production as well, and I would love to see conclusive info on that. I have found several different ground speed ranges given depending on the year of the sales literature.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Posted By: steve(ill)
Date Posted: 13 Feb 2025 at 8:20pm
I just looked up in the PARTS book and they list ONE bull gear for the B... but a couple options for the C.... As John said, the ground speed seemed to change over the years and SOME have said this is due to the final drive ratio.... I tend to think it is more related to the TIRE SIZE and GOVERNOR speed which changed over the years...
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Like them all, but love the "B"s.
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Posted By: Tcfcowboy
Date Posted: 14 Feb 2025 at 6:51am
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Ok thanks, I’ll count the teeth, and check the size of the bull gear.
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