Allis C slower gear needed
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=121079
Printed Date: 18 Sep 2025 at 9:43am
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Topic: Allis C slower gear needed
Posted By: Alex09(WI)
Subject: Allis C slower gear needed
Date Posted: 28 Mar 2016 at 10:19pm
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I there any way to slow down 1st gear on a C allis? Maybe put CA final drives on? Also I read that during the war 1942, 1943 they had a slower ring/pinion for steel wheels or is this a myth? ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Replies:
Posted By: Dakota Dave
Date Posted: 29 Mar 2016 at 3:32am
| You would have to put the CA transmition in place of yours. Steel tractors were geared the same as rubber tired ones. |
Posted By: DougS
Date Posted: 29 Mar 2016 at 6:25am
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Put the front wheels on the back and the back wheels on the front. |
Posted By: NICKMI
Date Posted: 29 Mar 2016 at 7:54am
| Another option is a Sherman under drive transmission if you can find one |
Posted By: Alex09(WI)
Date Posted: 29 Mar 2016 at 11:29pm
I thought that if you used a CA trans with B/C finals the speed would be increased. That is why I thought a C trans with CA finals should make the opposite, slowing the tractor down. I did notice the 1st gear in a CA is 2 mph vs 2.5 mph with the C/B so maybe I will have to use the CA trans and finals. ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Dakota Dave wrote:Posted By: AJ
Date Posted: 30 Mar 2016 at 6:10am
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Wish I could find a Sherman transmission for my C.
------------- Can't fix stupid |
Posted By: CTuckerNWIL
Date Posted: 30 Mar 2016 at 7:17am
Below is CA parts SHAFT, w/13T pinion, GEAR, 77T ------------- 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: mruhlig77
Date Posted: 30 Mar 2016 at 7:26am
| Is using a G trans also a myth??? |
Posted By: CTuckerNWIL
Date Posted: 30 Mar 2016 at 7:27am
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By that either C final would be slower than the CA final. So,by my thinking, if you had a CA tranny and the early C finals, PINION - 12T and GEAR ASY. 82T,you would get the slowest speeds.
------------- 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: Alex09(WI)
Date Posted: 30 Mar 2016 at 10:20am
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thats some food for thought, thanks guys
------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Posted By: Gerald J.
Date Posted: 30 Mar 2016 at 1:28pm
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Without more part numbers for the final drive housings, there's no proof that the shaft centers are the same distance apart for each set of drop box gears, so its not very likely to be possible to swap final drive gears to slow the tractor. The chances are a little better in the differential, but not guaranteed. For truck final drives it has been possible to get gears with a ratio from about 2.79 to at least 5.4:1 at least for my F150 that was the case. 4.10 vs 3.08 gives it a lot better towing capability with the manual transmission and because it was not getting the engine speed up to good torque territory, the gas mileage didn't change. I have no proof, but I believe AC would have used relatively stock ring and pinion for the differential, standard auto gear maker parts so others may interchange. Will take taking that assembly apart and measuring the gears and their mountings and finding a hot rod shop with a stock of special gears to try to find a match. Otherwise for slow speed smaller drive tires will accomplish that at the cost of ground clearance. A hitch dragging on the ground doesn't pull implements very well. Another way of slowing would be to go to a tracked assembly that uses a much smaller drive drum than the original diameter. However buying new is not cheap. Sold to fit trucks for deep snow travel. http://www.americantracktruck.com/" rel="nofollow - http://www.americantracktruck.com/ https://www.mattracks.com/" rel="nofollow - https://www.mattracks.com/ http://www.trackvehicletech.com/4x4-vehicle-track-systems.html" rel="nofollow - http://www.trackvehicletech.com/4x4-vehicle-track-systems.html And several others. Those with the small driving drums will give the greatest speed reduction, while increasing traction and floatation. Some I saw offered for tractors too but I didn't dig into the details. http://www.google.com/search?as_q=tracks+for+trucks&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=&as_occt=any&safe=images&as_filetype=&as_rights=" rel="nofollow - http://www.google.com/search?as_q=tracks+for+trucks&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=&as_occt=any&safe=images&as_filetype=&as_rights= Gerald J. |
Posted By: CTuckerNWIL
Date Posted: 30 Mar 2016 at 7:28pm
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If you had the complete final drive units from the early C, you can't get any slower gears other than putting in a CA tranny or an underdive Sherman gearbox without a lot of expense. ------------- 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: Dusty MI
Date Posted: 30 Mar 2016 at 9:22pm
The G uses the same transmission as the B & C. Power from the engine on the G goes to the front of the transmission using the shaft & gears that the B & C use to drive their PTO. The Special Low for the G is in the housing fasten to the front of the transmission housing. When I got my G it needed a gear. I got one from a salvage yard out of a bin marked for a C. Dusty ------------- 917 H, '48 G, '65 D-10 series III "Allis Express" |
Posted By: PaulB
Date Posted: 31 Mar 2016 at 2:36pm
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The problem with thinking that a G transmission would slow down an B or C is the extra gear would be located in the rear of the B&C torque tube where the crossbar for the foot rest is. If you really had to do it, you'd need to fabricate some way to hold the front half and back half of the tractor together. (a redneck with a welder can do almost anything that he sets his mind to, although it may not be pretty) All the normal B&C gears are interchangeable with the G. Anyway you look at it there's no cheap way to slow down a B or C other than smaller rear tires.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: Alex09(WI)
Date Posted: 31 Mar 2016 at 10:28pm
I might be wrong but wouldn't the smallest pinion gear with the largest bull gear give the slowest speed? That would be the post 23080 12/69 gears with a 5.75:1 reduction in speed. Or am I thinking backwards? ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Posted By: allischalmerguy
Date Posted: 31 Mar 2016 at 11:23pm
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One way to make the C or B go slower is smaller wheels..??? ------------- It is great being a disciple of Jesus! 1950 WD, 1957 D17...retired in Iowa, |
Posted By: SHAMELESS
Date Posted: 01 Apr 2016 at 12:48am
| also idle it down! |
Posted By: CTuckerNWIL
Date Posted: 01 Apr 2016 at 6:26am
Yep. I was trying to put the 12 pinion with the 82 bull gear I guess.  ------------- 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: Gerald J.
Date Posted: 01 Apr 2016 at 9:36am
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The pinion with the fewest gear teeth mated with the bull gear with the most teeth will give the slowest ground speed, PROVIDING the teeth are the same pitch AND the shaft centers fit the gear box. There is no guarantee the geer centers are the same for different gear sets and that the gear teeth are the same size for different sets. Three parts have to match, the pinion, the bull gear, and the case. Gerald J. |
Posted By: Alex09(WI)
Date Posted: 01 Apr 2016 at 9:49pm
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The reason I want to slow it down is so I can use bigger tires. So if I
use the later C finals I would have the lowest gearing and If I use a
CA trans I could lower first gear even more. Gerald- I would just swap the whole axle/final assembly. ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Posted By: PaulB
Date Posted: 02 Apr 2016 at 6:48pm
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Alex: From what I read you really just want a CA then, right? There were enough of them made you should be able to find one.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: Ken in Texas
Date Posted: 03 Apr 2016 at 12:20am
| Paul is right. Why mess with a C when there are plenty CAs to be had |
Posted By: Alex09(WI)
Date Posted: 03 Apr 2016 at 1:57am
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Yes, It certainly seems like that would be the easiest route to go, given that the gearing is the slowest possible.
------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |
Posted By: TramwayGuy
Date Posted: 03 Apr 2016 at 8:52am
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There was only one housing listed for the 'C'. So all the gear combinations would have fit. Those are: 19/94. (Early tractors up to 109). Ratio 4.947 15/82. All tractors 109 to 15714 and air tires only 15714 up to 23080. Ratio 5.467 12/69. Steel wheels only 15714 to 23080 and all tractors after 23080 Ratio 5.75 For what it's worth; the 'B' used a 14/67 combination. Ratio 4.786 All tractors used the same ring and pinion combination. Since the transmission was possibly made by Clark, perhaps ring and pinions from another brand tractor would fit. |
Posted By: sandman2234
Date Posted: 09 Apr 2016 at 8:35pm
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How about using a D10/D12 torque tube with the 2 speed in it? Oh, and keep the 149 engine too! David from jax ------------- A proud member of the Allis Express movement! Northeast Florida |