Farm Equipment - Final Drive Ratios

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Final Drive Ratios

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=127965
Printed Date: 20 Oct 2025 at 7:24am
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Topic: Final Drive Ratios

Posted By: cadgent
Subject: Final Drive Ratios
Date Posted: 28 Aug 2016 at 10:09pm

Does anyone know the difference in the D17 series 4 & 180 Final drive ratios?

Replies:

Posted By: DrAllis
Date Posted: 29 Aug 2016 at 6:30am

5.43 to 1 on D-17 and 5.85 to 1 on 175-180-185.

Posted By: JC-WI
Date Posted: 29 Aug 2016 at 9:18am

I believe the 185 has one tooth less on the pinion to bull gear.

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Posted By: DrAllis
Date Posted: 29 Aug 2016 at 9:41am

The internal gears don't interchange. The 175-180-185 final drive gears are much wider than a D-17.

Posted By: cadgent
Date Posted: 29 Aug 2016 at 10:12am

Are 170's the same as a D17 IV?

Posted By: Gerald J.
Date Posted: 29 Aug 2016 at 10:17am

Working out the math, 14 tooth pinion to 76 tooth ring gear is 5.428571:1 close to 5.43. 13 tooth pinion to 76 tooth ring gear is 5.846154:1 close to 5.85.

Gerald J.