Pulling Forum - WD/WD45 speeds

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WD/WD45 speeds

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=143055
Printed Date: 24 Nov 2024 at 12:41am
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Topic: WD/WD45 speeds

Posted By: mjbower
Subject: WD/WD45 speeds
Date Posted: 02 Oct 2017 at 9:19am

I've been told that there is a wheel speed difference between these two models. Is there? Books I look at show both models to be 2 1/2 mph in 1st gear. I have heard that a 45 diesel is slower in 1st. Can someone clear this up for me? Thinking of building a transfer sled tractor. Thanks for the help.

Replies:

Posted By: DrAllis
Date Posted: 02 Oct 2017 at 12:23pm

Old WD's had a low gear of 2.5 MPH. Late WD's and all WD-45's had a low gear of 2.3 MPH. All WD-45 diesels and all D-17's have a 15% slower ring and pinion gear set making ALL gears a slower ratio, but the engines run more RPM's to get the ground speed back up to where the others are. I've got all the transmission gear ratio numbers at home, but these are the basic differences.

Posted By: mjbower
Date Posted: 02 Oct 2017 at 11:40pm

Ok thanks

Posted By: DrAllis
Date Posted: 07 Oct 2017 at 7:42am

Low gear ratio thru the differential (not the final drives) is 18 to 1 for a D-17 or WD-45 diesel......15.3 to 1 on a WD/WD-45 with curved gearshift..........13.3 to 1 on a straight stick WD.