WD vs WD45
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=43230
Printed Date: 24 Aug 2025 at 4:29pm
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Topic: WD vs WD45
Posted By: Steve(SEMN)
Subject: WD vs WD45
Date Posted: 04 Jan 2012 at 4:59pm
| Anybody have a past post on how you tell the what your tractor is if the serial # is in between the WD or the WD45. The Ser # is 156,000 something. Does the 45 back up faster? |
Replies:
Posted By: Rfdeere
Date Posted: 04 Jan 2012 at 5:08pm
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The last WD was serial number 146606. The first WD45 was 146607. Your tractor is a 1953. WD has a 2 mph reverse, WD45 has a 3.25 mph reverse. ------------- Randy Freshour,Member Indiana AC Partners, http://www.rumelyallis.com" rel="nofollow - http://www.rumelyallis.com |
Posted By: CTuckerNWIL
Date Posted: 04 Jan 2012 at 5:10pm
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WD-45 production began at 146607 in 1953. You have a WD45. I don't know about differences in reverse, someone else will know. I don't know why the serial numbers overlap on the reference page but, if you look down below that chart it tells you the break in the serial numbers. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: DrAllis
Date Posted: 04 Jan 2012 at 8:50pm
| Straight stick WD's are 2 mph reverse.......late model bent stick WD's and all WD45's are the faster reverse (3 1/4 mph) and faster 4th gear(12 mph) and slower 1st gear (2 1/3 mph). |
Posted By: Brian G. NY
Date Posted: 05 Jan 2012 at 9:51am
| The WD manual shows a higher speed for "Fourth" in the "second type" transmission; 10-3/4 vs 9. However, I don't believe the rear axle ratios were different, so I assume the faster 4th gear must be attributable to larger tires or, am I wrong in assuming that 4th is "direct" in both trannys.. |
Posted By: CTuckerNWIL
Date Posted: 05 Jan 2012 at 10:02am
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Higher engine RPM would also make a difference. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: Brian G. NY
Date Posted: 05 Jan 2012 at 10:34am
| I thought about that too, but, all my manuals from the early WD to the WD-45 show the same Governed engine speed of 1,400 RPM and "high idle" speed at 1677-1722 RPM. |
Posted By: Lester
Date Posted: 05 Jan 2012 at 10:40am
| WD45 is geared higher in 4th because of higher rearend. |
Posted By: DrAllis
Date Posted: 05 Jan 2012 at 12:20pm
| Ring and pinion (which is part of the transmission) is faster on the "type two" transmission. |
Posted By: Brian G. NY
Date Posted: 05 Jan 2012 at 3:50pm
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That must be the answer.
Altho the pinion gear is on the main shaft and might be considered part of the transmission, I would consider the ring gear a part of the differential.
Fine line, there?
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Posted By: DrAllis
Date Posted: 05 Jan 2012 at 4:27pm
| The point was, the trans mainshaft (pinion) doesn't interchange between the two transmissions, so the speeds are tied to which transmission it is. |
Posted By: Brian G. NY
Date Posted: 05 Jan 2012 at 9:23pm
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OK....I admit having never been into either tranny.
Both the WD and WD-45 have 43 tooth ring gears, how many teeth on the WD pinion vs the WD-45 and what is the effective ratio of each?
Thanks
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Posted By: CTuckerNWIL
Date Posted: 06 Jan 2012 at 9:14am
And which WD is this for(straight shifter or curved)? It has to be for the curved shifter WD's. The late WD had the same tranny as the 45. If the ring gear had different numbers of teeth, I believe the pinion would have different numbers as well. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Brian G. NY wrote:Posted By: Brian G. NY
Date Posted: 06 Jan 2012 at 4:33pm
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Actually, the early WD ring gear and the late WD/WD-45 ring gears both have 43 teeth.
However, they have different part numbers.
So........I think, as Doc says, the ratios must be different between the early WDs and the late WD/WD-45s.
Therefor, there must be a higher tooth count on the pinion gear for the late WD/WD-45 than the early WD which would account for that different ratio.
I know I have an early WD pinion gear lying around here somewhere so I could count the teeth on it.
I was hoping Doc could give me the tooth count on the late WD/WD-45 pinion just for my edification and for notation in my parts manual.
I have made notes in both my repair manuals and parts manuals of information I've gleaned from people on this site.
I'm getting old(er) now and may not be able to use all this valuable info but maybe whoever winds up with all my "stuff" will make good use of it! LOL
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Posted By: DrAllis
Date Posted: 08 Jan 2012 at 9:45pm
| The ring and pinion for late WD's and all WD45 gassers must be 13 teeth pinion and 43 teeth ring gear which is 3.3 to 1 according to my service book. Then, an older WD must be 12 teeth to 43 teeth which is 3.5 to 1. The only info the service book gives is 3.5 to 1 and 3.3 to 1, no actual gear tooth count. A WD45 diesel and any D17 is 9 tooth pinion to 35 tooth ring gear for 3.9 to 1 ratio. |
Posted By: allischalmerguy
Date Posted: 08 Jan 2012 at 10:57pm
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I know I have a 1950 WD and there are times I wish I had a slower 1st gear..thanks for sharing all this stuff.
------------- It is great being a disciple of Jesus! 1950 WD, 1957 D17...retired in Iowa, |
Posted By: Brian G. NY
Date Posted: 09 Jan 2012 at 10:55am
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Thanks Doc,
Just one more little piece of info for future reference.
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