Pulling Forum - D17/170/175 Final Drives

Print Page | Close Window

D17/170/175 Final Drives

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=209535
Printed Date: 30 Dec 2025 at 8:07pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D17/170/175 Final Drives

Posted By: KevinON
Subject: D17/170/175 Final Drives
Date Posted: 30 Dec 2025 at 2:36pm

Just curious, was thinking of changing the final drives on my 185 LLSS build to the faster D17/170/175 final drives. I understand that they are not as wide. Would they be strong enough, is my question? Thoughts for a snowy, wintery day like today....lol.

Replies:

Posted By: tbran
Date Posted: 30 Dec 2025 at 2:47pm

70251775 is the same on 180/185/175 70237058 is the other pinion D17/170

and 70247872 / 70237059 are the bull gears for 185 / D17

-------------
When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: KevinON
Date Posted: 30 Dec 2025 at 2:56pm

So by that I should be changing the pinion shaft?

Posted By: DrAllis
Date Posted: 30 Dec 2025 at 6:37pm

175-180-185 final drives are identical and are the widest/strongest final drives at 5.85 to 1 ratio. D-17 S3 and S4 and 170's are all the same strength/width and 5.43 to 1 ratio, for a 7% speed-up. Change the whole axle/final drive assembly !! How much HP they will take ??? I know of one tractor that has run one season at probably 350-400 HP without issues. Keeping under 7,000 lbs will help. The lighter the better. The less bar height on your tires is also good. LLSS class?? I wouldn't even think about it.

Posted By: KevinON
Date Posted: 30 Dec 2025 at 7:46pm

Thanks Dr. I will stick with the 185 finals then.