175 gear reduction ?
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=212494
Printed Date: 13 Oct 2026 at 12:32am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 175 gear reduction ?
Posted By: Macon Rounds
Subject: 175 gear reduction ?
Date Posted: 12 Oct 2026 at 9:59pm
Why did Allis slow the 175 tractors down ?
And
The later 175 tractors even had a slightly bigger diesel engine. Than the 170 diesel.
My understanding is it was done thru the final drives.
But
I am still learning...
What the story here ?
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The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate
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Replies:
Posted By: DrAllis
Date Posted: 12 Oct 2026 at 10:15pm
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175-180-185's all have the heavier duty/wider bull gear final drives that are 5.85 to 1 ratio. This began in 1967 with the new model One-Eighty. The HP was 64. The weight (with fluid) was around 8,000 lbs. The rear rubber was 18.4 x 28's that are larger diameter than a 16.9 x 28. The gear ratio reduction offset the larger diameter tire so that high second gear was still "plow gear". So, in the end engineers felt that anything over that 55 HP number was going to get the stronger final drives. Remember, after the 190XT and D-21 rear end failures, they weren't taking any chances.
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Posted By: Macon Rounds
Date Posted: 12 Oct 2026 at 10:32pm
In my arena 170/175 tractors are not a tillage tractor.
And in the rhelm of bigger tillage tractors why would you slow the 175 down.
I currently run 30" tires on my D17's and 170 tractors for hay making operations. So to speed them up. I feel like i'am sleeping on my 175...
Great technical data on the 175. Thanks Doc...
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The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate
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