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Farmall Cub to Farmall Regular


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#1 FSB

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Posted 04 March 2012 - 08:24 PM

Maybe someone knows this. I'm wondering if the right hand rear axle of a Farmall cub will also bolt on and work on the left hand side.

I'm thinking of making an almost 2/3 scale? of a Farmall Regular or F20 or F30. I'm thinking of using a 154 Cub front half and the back half of an original Farmall Cub by using two long back axles; and making a homemade front end to resemble a Regular -- or maybe just a center lined Farmall Cub parade tractor with the original Cub wide front axle and two long back axles; maybe with a seat wide enough for three.

I'm wondering -- on a 154 there is an 1-1/4 spacer on the right hand side but the drop axles appear to be the same right and left.

I realize the brake for the right wheel is out at the drop axle and for the left wheel the brake band is sunk in somewhat to the differential housing. That's why I'm wondering if the long axle will fit ont he left side or will the axle be too short?

The 154 frame rails already resemble a Regular or F series Farmall. I realize that if it would work the right hand side would be about 1-1/4 narrower than the left.

My reason for using a Cub rather than a Farmall B is the Cub is smaller and easier to transport.

Any thoughts.

Thanks.

#2 Farmall504#20

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Posted 04 March 2012 - 09:34 PM

Yes you can Ive see 2 or 3 tricycle cubs before . pretty neat looking .

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#3 Harold H

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Posted 04 March 2012 - 09:50 PM

I have seen several regular Cub's that have been converted to tricycle front and equal sided rear. They did not look like too complicated a conversion. Making it look like a small scale Regular should be interesting. Several times I have thought about converting my I-4 into a small scale "Rice Field Special WR-4" but decided to keep it stock. I would love to have a real WR-9 but they are much too big to be practicle for me, was my idea for making a WR-4.

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#4 RaymondDurban

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Posted 04 March 2012 - 10:40 PM

In order to have the tractor centered, you'll need the spacer on the right side like the 154, but then you'll need to lengthen the differential shaft. For the left side, the axle extension will bolt right on, but you'll need a differential shaft of the same length on the left as you now have on the right (so two the same length). If you decide to skip the spacer and not worry about the slight offset, you'll still need the longer than stock differential shaft for the left side. Either way If you go with the double seat like the one above, there's still an issue with the floorpan for the left, you'll need to fab up something to fill in the gap, along with figuring out a way to attach it to the left side of the case.
It's all not a bolt on mod, you will need to do some welding and fabrication

On the 154, the finals are not interchangeable because there is only one brake opening. They also cannot be rotated 90*, but can however be rotated 180* provided you reroute the brake linkages to the rear. Farmall Cub finals can be swapped (two brake openings), and also rotated 180*. Typically if swapped, the axle stays on the same side due to the planter drive.

#5 John cub owner

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Posted 07 March 2012 - 09:45 PM

One of the people who built a tricycle cub told me he had to machine the transmission to mount an axle extnesion on the left side. He said it was pretty involved.

#6 RaymondDurban

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Posted 08 March 2012 - 10:32 AM

One of the people who built a tricycle cub told me he had to machine the transmission to mount an axle extnesion on the left side. He said it was pretty involved.

John, on the tricycle that George built, he lengthened the shaft on the left side (1 1/4" I believe) and bolted the axle extension on. On the right, he left it stock. His tricycle is not a "centerline" tractor.
On the RatCub, he cut and milled the 1 1/4" bumpout off the side of the transmission and drilled and tapped new holes in the case for the axle extension and the floorpan. This way he didn't have to extend the differential shaft or fill the 1 1/4" gap between the floorpan and case. By milling the side of the case off, the tractor is now centered except for the front axle, which he left the pivot offset.



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