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Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 3:12 pm
by NorthSouth
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Hello fellow Model T-ers,
Have any of you heard of a “Jumbo” brand two-speed rear end? Here is a photograph, the best I could find, of one on a 1910 model T Ford. I would be interested in whether they work similar to a Ruckstell, whether or not they are problematic, and any other information about them.
Thank you in advance for guidance you might give me on this question.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 3:59 pm
by Dan McEachern
need a better picture- looks like it may be a driveline trans of some sort, but...…………….
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 4:02 pm
by Scott_Conger
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 4:18 pm
by Wayne Sheldon
Just a quick clarification. The photo offered may be of a "1910" car, maybe a wannabe 1910? But the rear end appears to be later 1910s. The Planator underdrives (either Starr or Jumbo) are a 1920s era accessory.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 4:29 pm
by Norman Kling
It might work fine, but since it has a modification of the driveshaft and driveshaft tube, and is not as common as the Ruckstell, I would recommend the owner keep a stock rear end complete with the driveshaft just in case the Planator breaks down, they can still use the car with a simple transfer of the rear axle assembly.
Norm
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 8:33 pm
by kelly mt
Planators, I think that's what you have there, can get into a neutral condition. You will want outside auxiliary brakes if you run one. I think they have a 50% reduction.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 8:45 pm
by Southfork Creek
I had one in a 1915 that was on a Southern Wide Track chassis. I figured (guessed) it was originally used on real muddy roads, or some other low speed function. So, for me, it was pretty much useless for traveling on paved roads as all I needed was the High and Low pedal. Just extra weight for not much practical purpose.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 9:30 pm
by Steve Jelf
The 50% reduction is the same as a Ruckstell. I believe the advantage is low gearing in high for climbing and descending grades without having to resort to the tiresome low pedal. Not very important in the relatively flat middle of the country, but quite desirable in places like Pennsylvania and the western states, both of which have long, steep grades.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 9:41 pm
by Dropacent
The Jumbo planatar can’t get into neutral unless there is something seriously broken. They fixed flaws from the earlier Starr Planatar design to take care of that. If either one’s inside condition is unknown, it is always smart to have another source of brakes.
Re: Has anyone heard of a “Jumbo” brand two-speed rear end?
Posted: Mon Jul 19, 2021 11:17 pm
by Wayne Sheldon
The Planator, along with Moore and the Universal (brand name!) are desirable in the brass era crowd because they can be used on an early 'clamshell' rear end which the Ruckstell cannot be used on. They cannot be used on the earliest clamshell rear ends used in the first year of manufacturing due to the Babbitt pinion bearing and special torque tube. They give most of the useful advantages of a Ruckstell without having to giv up the desirable early rear axle.
The Ruckstell axle can be used on the 1913'/14 (which actually came out late in the 1912) rear end and everything later.