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Trans swap


 
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Mo in NE Tx
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Joined: 11 Nov 2012
Posts: 234
Location: Greenville, Tx

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PostPosted: Fri Jan 03, 2020 5:00 pm    Post subject: Trans swap Reply to specific post Reply with quote

Will the trans from a CA fit on a B or C? Wondering about it to see if I can get the extra top end speed!
 
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Aaron SEIA
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Joined: 16 Dec 2003
Posts: 2414
Location: SE Iowa

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PostPosted: Sat Jan 04, 2020 5:40 am    Post subject: Re: Trans swap Reply to specific post Reply with quote

The problem is the differential and final drives are bolted to the transmission case. It's an all in one deal. You'd literally have to swap everything from behind the torque tube.
AaronSEIA
 
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Tramway Guy
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Joined: 04 Oct 2003
Posts: 3136


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PostPosted: Mon Jan 06, 2020 5:30 am    Post subject: Re: Trans swap Reply to specific post Reply with quote

It wouldn?t increase your speed at all. Both are direct drive in high gear.
 
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Aaron SEIA
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Joined: 16 Dec 2003
Posts: 2414
Location: SE Iowa

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PostPosted: Mon Jan 06, 2020 6:05 am    Post subject: Re: Trans swap Reply to specific post Reply with quote

Where does the CA's extra 4 mph come from? Engine speed was only 10% greater and the CA is on basically the same size tire. Is it in the differential and final drives?
AaronSEIA
 
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Mo in NE Tx
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Location: Greenville, Tx

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PostPosted: Mon Jan 06, 2020 4:24 pm    Post subject: Re: Trans swap Reply to specific post Reply with quote

According to Tractor Data, the CA is a four speed instead of 3 speed found on B?s.
 
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Aaron SEIA
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Location: SE Iowa

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PostPosted: Tue Jan 07, 2020 5:09 am    Post subject: Re: Trans swap Reply to specific post Reply with quote

Yes it is.
AaronSEIA
 
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Aaron SEIA
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Joined: 16 Dec 2003
Posts: 2414
Location: SE Iowa

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PostPosted: Tue Jan 07, 2020 7:23 am    Post subject: Re: Trans swap Reply to specific post Reply with quote

The C used a 6 tooth to 37 tooth differential while the CA used a 7 and 37 gear set. The C used a 14 to 69 ratio on the final drives and a CA used 7:37. To gain the speed, you'd need to swap the differentials and final drive gears. By the time you did all of that, you just as well buy a CA. You would literally be bolting the entire back half of a CA to the C engine.
AaronSEIA
 
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Nordic
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Joined: 14 Dec 2015
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PostPosted: Tue Jan 07, 2020 7:23 pm    Post subject: Re: Trans swap Reply to specific post Reply with quote

My grandfather bought a brand new '55 model B made in England, it came with a factory 4 speed and oh was it fast in 4th gear. I don't know of a tractor for miles around that could top the speed it had. It would beat a Zetor and they were known to do at least 25 miles per hour. A number of years later grandfather had to have one final drive gear replaced and a used one from an older B with a 3 speed worked as a perfect match. I have an old 3 speed B myself and I used to drive grandfather's a lot and yes I wish I had the same 4 speed set up he had.
 
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