Farm Equipment - 6000 series FWA front to rear axle ratio

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6000 series FWA front to rear axle ratio

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=149801
Printed Date: 31 Oct 2025 at 5:54am
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Topic: 6000 series FWA front to rear axle ratio

Posted By: Meanolallis
Subject: 6000 series FWA front to rear axle ratio
Date Posted: 24 Apr 2018 at 8:10am

Does anyone know what the ratio between the front and rear axles was on the 6060, 6070, 6080 FWA?

I'm looking at getting new tires and just want to match the front/rears correctly to minimize drive train wear. The manual just gives approved combinations, but I'm wondering what the actual ratio is so I can consider tires of different sizes/styles... This is rather necessary knowledge if you want to put radial tires on which have different sizing than bias tires, correct?

Or am I over-thinking this...?

Has anyone used Alliance tires on the fronts and how did you like them?

Thank you,

Peter

Replies:

Posted By: hillmonkey
Date Posted: 24 Apr 2018 at 11:08am

Yes you might be over thinking it a bit. google "petes tire store", search your desired tire sizes and under description find "mounted tire dia". write down all the sizes front and rear for all the bias brands you can find and average them out. do the same for the radials and compare to the Allis original numbers/size.
I remember the Allis engineer that posted on here often, said they found that the FWDs worked best with +5-7% front bias. do the math with above #s and get it as close as you can. i would say anything from 0-10% would be fine. always use 2wd on roads or hard surfaces.

Posted By: Stan R
Date Posted: 24 Apr 2018 at 12:26pm

Just get the diameter of the approved tires front and back and ratio it up or down for larger or smaller tires.