Allis C slower gear needed

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?

Put the front wheels on the back and the back wheels on the front.

Dakota Dave wrote: You would have to put the CA transmition in place of yours. Steel tractors were geared the same as rubber tired ones.

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.

SHAFT ASY. (Incl. PINION - 19T & Item 6) (Prior TR. C-109) (C)
		70211936	2	SHAFT ASY. (Incl. PINION -15T & Item 6) (TR. C-109 up to C-15714 & only w/Air Tires up to C-23080) (C)
		70223437	2	SHAFT (Incl. PINION - 12T.) (TR. C-57368 & UP) (Used on C-15714 thru C-23080, W/STEEL WHEELS)

	GEAR ASY. (67T.) (B & IB)
		70209649	2	GEAR ASY. (94T.) (C) (Prior to TR. C-109 - See M.N.I.) (Use 2 of 70211935, 1 of 70211936, 70206449, 70206450)
		70211935	2	GEAR ASY. (82T.) (TR. C-109 up to C-15714 W/AIR TIRES up to C-23080) (C)
		70213415	2	GEAR ASY. (69T.) (Used W/STEEL WHEELS on TR. C-15714 up to C-23080; Used on all TR. C-23080 & up) (C)

Above is list of C  final drive parts
Below is CA parts
SHAFT, w/13T pinion, GEAR, 77T

Edited by CTuckerNWIL - 30 Mar 2016 at 7:18am

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.

Edited by CTuckerNWIL - 30 Mar 2016 at 7:34am

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/
https://www.mattracks.com/
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=

Gerald J.

mruhlig77 wrote: Is using a G trans also a myth???

CTuckerNWIL wrote: 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.

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?

also idle it down!

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.

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.

Yes, It certainly seems like that would be the easiest route to go, given that the gearing is the slowest possible.

How about using a D10/D12 torque tube with the 2 speed in it? Oh, and keep the 149 engine too!
David from jax