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CA trans swap into a Model B/C
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KMAG View Drop Down
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Joined: 26 May 2020
Location: Elizabethtown,
Points: 671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KMAG Quote  Post ReplyReply Direct Link To This Post Topic: CA trans swap into a Model B/C
    Posted: 10 Jul 2021 at 7:12am
There have been a number of posts about it being possible. A post said everything bolts up, but there is something different about the CA final drive castings vs B/C that causes a problem sliding them into the CA trans.

Has anyone on here DONE this conversion? If so, please share your experience. Thank you.




Edited by KMAG - 10 Jul 2021 at 8:54am
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 8:48am
The B and C final drives bolt to the differential case with 4 studs. The pattern is perpendicular to the ground.. I believe the CA the bolt pattern is canted backward slightly. STill bolt up, but the wheel base ends up being a few inches longer. ......... also remember the CA uses a different hydraulic pump than the B / C ... not interchangable.... Change the pto case if you want the NEW PUMP ..... trans OK.

Edited by steve(ill) - 20 Jul 2021 at 3:32pm
Like them all, but love the "B"s.
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Points: 81671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 8:54am
I guess if your trying to put B final drives on a CA, that should be OK... If you trying to put a CA transmission in a B, get the pto case / hydraulic pump also.

Edited by steve(ill) - 20 Jul 2021 at 3:32pm
Like them all, but love the "B"s.
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Joined: 26 May 2020
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Points: 671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KMAG Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 8:57am
I am looking into a 4 speed B. I like the B's smaller size, but need higher road speed to join tractor drives (10mph req) and it makes driving to local shows (w/in 8mls of home) quicker.
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steve(ill) View Drop Down
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Points: 81671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 9:14am
YEP... put 12.4 tires on it also.
Like them all, but love the "B"s.
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Points: 1701 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Alex09(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 11:24am
I have swapped a CA trans into a C tractor myself. Customer needed higher raod speed for tractor drives. I raced my WD45 with the C after the 4-speed conversion and I barely went faster at stock throttle setting.

It is a direct interchange EXCEPT FOR THE DIFFERENTIAL BEARING CARRIERS!! The B/C axle housings are smaller on the ID where they bolt up to the transmisssion. You have 2 options: Grind the inside of axle housing out so they slide over the CA carriers, OR turn the OD of the CA bearing carriers down 1/8" so they are the same size as the B/C carriers and the axle will bolt on without interfering. Can't remember what I did for the PTO housing.
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Points: 4775 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2021 at 3:26pm
Also I think the seat rails and footbars are different widths, at least the CA foot is a bent angle vs the B/C square box. The difference in the slant of the CA final drives is all in the axle housing. The B/C PTO will go onto the CA transmission if you use the B/C sliding drive gear. Johnny Cash will be proud of you Big smile
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
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Points: 115 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jgranat Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 2021 at 10:41pm
My first CA had a B PTO on it, I think it was you Paul who pointed it out to me, that was 20+ years ago....thanks by the way.
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i am watching this post as i am working on a c right now
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Originally posted by steve(ill) steve(ill) wrote:

YEP... put 12.4 tires on it also.
13.6 will be a bit fast or step up to 14.9''s. Dad had 14.9's on his CA from the first time he tried discing plowed ground. They stayed on for 40 years anyway.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY
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Points: 3775 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 2021 at 8:14am
I've got the CA tranny if one of you gentlemen wants to give this a try!
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Points: 796 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corbinstein Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2021 at 6:28am
So my question is this, will it slow down a B/C in first?
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Originally posted by corbinstein corbinstein wrote:

So my question is this, will it slow down a B/C in first?

Tractor data says 1st gear for 'B', 2.5 MPH, 'CA', 2.0 MPH.
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TRACTOR DATA 
shows the B as 2.5 mph in first and 7.5 mph in 3rd...
shows the CA as 2 mph in first and 11.2 mph in 4th.

some of that depends on what the final drive ratios are..


Edited by steve(ill) - 22 Jul 2021 at 8:04am
Like them all, but love the "B"s.
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Points: 1701 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Alex09(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2021 at 10:02am
I thought I researched this before. Using the CA transmission and the B/C axles, you have faster speeds, than with the CA axles.
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Points: 11446 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TramwayGuy Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2021 at 11:38am
“ have swapped a CA trans into a C tractor myself. Customer needed higher road speed for tractor drives.”

Isn’t 3rd gear on a C the same as 4th on a CA? Both direct drive?

Seems like the final drives might be a more fruitful approach.
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4th in a CA is overdrive. The final drive ratio in a CA is slowest of the three the B is the fastest. The C is slower than a B by a slight bit.
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
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Points: 81671 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2021 at 3:05pm
So by putting B finals on a CA 4 speed, you dont get much mph reduction ( if any) on the bottom end, but in 4th you would be FASTER than the CA ?
Like them all, but love the "B"s.
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