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Larry(OH) 
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Joined: 11 Sep 2009
Location: Shreve Ohio
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 Topic: WD vs 45 rear end ratios
Posted: 12 Nov 2018 at 2:12pm |
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I was always under the understanding that a WD & a 45 were the different ratio but staright gear to helical. Also thought a 45 Diesel is slower yet. After doing some looking in Zach Petersons book, it appears that a 45 has a lower ration in first than a 45 diesel and a WD. Which way is it I ask?
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'40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie
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DrAllis
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Posted: 12 Nov 2018 at 3:30pm |
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I've got all the ratio numbers at home. The straight stick WD's had the fastest low gear of what they called 2.5 MPH @1400 RPM. The helical gear WD / WD45's were 2.3 MPH in low. All WD45 diesel rear ends have a ring & pinion that is 15% slower than the gas tractors and is the same as all D-17's. The diesel WD45 engine ran 1625/1650 RPM rated speed instead of 1400 RPM, so the actual ground speeds were pretty close to the same with the same size rear tire. I'll try to remember to get you the ratio numbers tonite.
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SteveM C/IL
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Location: Shelbyville IL
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Posted: 12 Nov 2018 at 11:37pm |
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45 gas and diesel trans are same.diesel had lower ratio R&P to offset higher engine rpm and keep ground speed "same". Diesel also used different PTO box to keep 540@540
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Larry(OH)
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Posted: 13 Nov 2018 at 5:25am |
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ill have to look at that again. i was comparing all 3 at the same rpm (i think it was 1500), with 15.5 /38 tires and i thought the 45 was the slowest of the 3. I'll find it and try to DL a pic of it. Thanks!!
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'40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie
*ALLIS EXPRESS contact*
I can explain it to you, BUT I cannot understand it for you!!
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DrAllis
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Posted: 13 Nov 2018 at 7:25am |
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The WD45 diesel would be the slowest low gear if RPM's are all the same. Sorry, I forgot to look last night at my ratio notes.
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mruhlig77
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Posted: 14 Nov 2018 at 12:28am |
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The 45 diesel and D-17 and D-19 were the same ring and pinion....this was used up until the 100 hp tractors started to break them.....my 45 puller has the D-19 setup....
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DrAllis
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Posted: 14 Nov 2018 at 5:44pm |
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WD ring and pinion is 3.6 to 1 ratio with low gear being 13.3 to 1 thru the differential. WD/WD45 helical gear transmission ring and pinion is 3.3 to 1 ratio with low gear being slower at 15.2 to 1 thru the differential. WD-45 diesel and all D-17's are 3.9 to 1 ratio ring and pinion with high side low gear being 18.0 to 1 ratio. All final drives are the same reduction ratio.
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Larry(OH)
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Posted: 15 Nov 2018 at 5:38am |
Thanks for th e info. Ill try to get a minute to look at the chart again tonight. That is a pretty good spread from a WD to a diesel for sure
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'40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie
*ALLIS EXPRESS contact*
I can explain it to you, BUT I cannot understand it for you!!
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blue924.9
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Location: George Iowa
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Posted: 15 Nov 2018 at 8:22pm |
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any idea what speed a helical wd/45 transmission and a wd rear end would give at stock wd engine rpm?
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hi my names dan, I am a young guy. i have a problem, i prefer my tractors orange and my clutches mechanical, thanks for letting me share
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DrAllis
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Posted: 16 Nov 2018 at 7:21am |
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You don't know what you are asking. The transmission/ ring & pinion/differential/rear end are all one. You cannot use a WD ring and pinion with WD-45 transmission gears assembled on them. You can interchange a gas and diesel ring and pinion in the WD-45 for a 15% change in speeds.
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deereequipment1
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Posted: 16 Feb 2019 at 2:32pm |
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Sorry Dr. Allis, this quote has me a little bit confused (see below).
I have a WD45 gas with 38's. I thought my best option is to run a WD45 diesel or D17 ring and pinion, to slow it down a little, giving me a little more power.
What you listed below,
WD 3.6 to 1 = 13.3 to 1
WD45g 3.3 to 1 = 15.2 to 1
WD45D 3.9 to 1 = 18.0 to 1
the diesel/d17 you say is higher ratio (3.9, where as WD 3.6 and WD45 3.3), but slower thru the differential?
or is there a typo somewhere?
Just wanted to confirm that I should consider a WD45 Diesel or D17 ring and pinion swap.
Thanks
"WD ring and pinion is 3.6 to 1 ratio with low gear being 13.3 to 1 thru the differential. WD/WD45 helical gear transmission ring and pinion is 3.3 to 1 ratio with low gear being slower at 15.2 to 1 thru the differential. WD-45 diesel and all D-17's are 3.9 to 1 ratio ring and pinion with high side low gear being 18.0 to 1 ratio. All final drives are the same reduction ratio. "
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Raised on a CA,WD,D10 & D15.
Now, proudly own and pull a WD45 high crop, WD45, WC,
also own a D-10, D-12, G and a CA.
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DrAllis
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Posted: 16 Feb 2019 at 4:20pm |
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Low gear in any late WD/WD45 gas is slower than low gear in any old straight stick WD. Low gear in a WD45 diesel or D-17 (high side low gear) is even slower than a WD45 gas. The difference is 15% slower and that is in the ring and pinion ratio. There is no typo.
Edited by DrAllis - 16 Feb 2019 at 4:21pm
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deereequipment1
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Posted: 16 Feb 2019 at 4:53pm |
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Thank you Dr. Allis.
The numbers had confused me.
WD 3.6 13.3
WD45G 3.3 15.2
WD45D/D-17 3.9 18.00
The 3. numbers go down and then up, where as the teen numbers constantly go up.
That's the only reason I asked if a typo.
Thanks again for all your information!!
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Raised on a CA,WD,D10 & D15.
Now, proudly own and pull a WD45 high crop, WD45, WC,
also own a D-10, D-12, G and a CA.
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DrAllis
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Posted: 16 Feb 2019 at 5:12pm |
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If you could install an old WD 3.6 to 1 ring and pinion (which cannot be done) into a late WD/WD45 rear end, low gear on that late WD/WD45 would be 16.65 to 1 instead of 15.2 to 1.
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MACK
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Posted: 18 Feb 2019 at 8:11am |
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The bigger the # the slower it is. 4.1-1 is slower than 3.1-1. Input shaft turns 4.1 turns while output shaft makes one turn = 4.1-1 ro. MACK
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Brian Jasper co. Ia
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Posted: 31 Mar 2019 at 12:30am |
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Would any of you have an old old copy of a parts manual that shows a part number for the gas ring and pinion as they were originally built? For service replacement the D17 ring and pinion is what Agco shows. I'm dealing with a block head that refuses to acknowledge the numbers that A-C published and the Nebraska Tractor Lab confirmed. "They were all the same" is what block head insists.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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AaronSEIA
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Posted: 31 Mar 2019 at 6:31am |
I never thought of that in that conversation. The online book is what I used. Never considered the fact that they might have subbed the D17 one to use. AaronSEIA
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DrAllis
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Posted: 31 Mar 2019 at 7:09am |
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There was a time (early 1960's) that the 245766 ring & pinion gear kit (9 teeth x 35 teeth) was used in all WD45 diesels, all D-17's, all D-19's and 190's prior to s/n 8250. As time went on it migrated into the 170 and 175 tractors too. The ring and pinion for the late WD and WD45 gas was odd and they decided to discontinue its production and forced you into changing over to the 15% slower ratio 245766 gear set. I cannot find the old p/n for the faster 13 tooth x 43 tooth gear set. It is perfect for a D-17 as a tractor ride tractor as 17+ MPH is a reality with 16.9 x 28 rear tires. Any late WD/WD45 gasser in salvage yards should have a serviceable R&P if it hasn't been run out of oil during its working life.
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Brian Jasper co. Ia
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Posted: 04 Apr 2019 at 7:22pm |
It makes perfect sense to drop production of the 13X43 gear set since it would not be used in any production after the WD45 was discontinued and especially since the D17 was going to continue with the 45D gears. Thanks. You could probably guess the name of the hardheaded individual who insists they were all the same from 127007 and up to the 100 series...
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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