Gears
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=144165
Printed Date: 04 Nov 2025 at 5:20am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Gears
Posted By: Acllss puller
Subject: Gears
Date Posted: 05 Nov 2017 at 3:01pm
OPS , dr Allis?
Looking to figure a tooth count to get gears made . I have Mack's overdrive box in at overdrive 18+% in a 190 rear . I'm at 22.01/1 in direct and I want to have around a 24:1 in third slot . Any ideas what tooth counts need to be to achieve this .
|
Replies:
Posted By: O.P.S. Heads
Date Posted: 06 Nov 2017 at 8:58pm
|
1 to 1 input gears with your 3rd gear paid being a 24 tooth gear on the countershaft with a 26 tooth gear on the main shaft.
|
Posted By: Acllss puller
Date Posted: 07 Nov 2017 at 8:34pm
|
Hey mike , so will those tooth count s work with my 18.6 % over drive , I have standard road gear now in place with Macs overdrive before the transmission so I'm at 22.01:1 in direct , so is a 24 and a26 going to be around 24:1 if I overdrive at 18.6% ??? Thanks for your help ! This is Mark from N Y .
|
Posted By: Acllss puller
Date Posted: 07 Nov 2017 at 9:00pm
|
Hey mike , so will those tooth count s work with my 18.6 % over drive , I have standard road gear now in place with Macs overdrive before the transmission so I'm at 22.01:1 in direct , so is a 24 and a26 going to be around 24:1 if I overdrive at 18.6% ??? Thanks for your help ! This is Mark from N Y .
|
Posted By: O.P.S. Heads
Date Posted: 08 Nov 2017 at 8:51am
|
The tooth counts I gave you will equal close to a final ratio that is 2 points slower than direct drive. It's as close as you are going to get as you only have so many teeth to move around. Keep in mind that with a 1 : 1 input gear ratio the input shaft and gear can no longer be made as one piece. The gear has to be separate from the shaft. It will be too large in diameter to fit through the bore in the front of the transmission case.
|
|