A friend has this two speed drive line. Can anyone tell me what make, year and value it is? Anything would be of interest. Thanks,PK
Looks like a "Jumbo Planator" The limitation is they are a 2-1 reduction. The plus is they can be used with any T rear axle so you can use it with a early "clamshell" and keep the right "LOOK" from the back. They basically use T differential gears inside so they are quite repairable.
I will guess you don't have the shifter leaver. Similar to a Ruckstell but different.
Along that vein I have a "Universal" brand in my '13 for the same reason.
I would maybe go $500.00 for it.
Could one of these be used for a Ruckstell? Could come in handy for a speedster, to get a few more gearing options. Just being curious. Looks like a cool alternative to a Ruckstell if you wanted to keep a stock look from the outside.
Thanks Les,that is good to know. This unit does have the shifter and mount. How reliable are they? I live and drive in the mountains and need something that stays in gear and will take a lot of load due to steep hills. PK
Here's a recent thread showing the innards of a Jumbo Planator: http://www.mtfca.com/discus/messages/331880/366101.html?1370871637
Considering the low gear is a 2.5:1 reduction, the Planator with 2:1 is a bit low as an intermediate gear + you should have accessory brakes since any accessory trans can slip into neutral..
Now that's something that would be neat if someone would reproduce.
The basic reliability is fine, but I would not consider it good for driving LOOOONG distances in reduction, as you are basically using T differential gears WITHOUT and anti-friction (ball,roller)bearings. So to drive up a hill occasionally it is fine. I have owned one in the past (sold it with a car). As with any of these the key is wear on the shifter "dog" clutch mechanism. These parts can obviously be made new if jumping out of gear presents as a problem. Note I said "made"!!! Don't expect to find new parts anywhere.
Because of the 2-1 ratio (which makes it less useful than a Ruckstell), and the fact that any special parts will have to be made, that is why I figure $500.00 is a good starting point. If I could examine the insides I might spend more.
I agree with Roger that auxilary brakes are essential with this unit.
Using it with a Ruckstell!! Wow you would have a seriously LOW gear. It wouldn't be my choice. I could see using a BW or Laycock overdrive with a Ruckstell and maybe have the best of both worlds
What I have is a 4 speed sliding gear (with 4th being overdrive, 3rd is direct, 2nd is of course underdrive) used instead of a Layne/Warford
I have one on my Town Car, works well but the ratios are not quite a friendly as the Ruckstell. Indeed it does use Ford gears plus a large differential gear with larger hole and a sliding double ended dog clutch. I have a spare, mine was bad and I had a talented machinist make two.
By the way Roger, I think Ford low is 3:1, but it is a little low.
Please consider that it is about 1/2 as good as a Ruckstell.
IF you wanted to make a 2 speed in the torque tube then I suggest you use Ruckstell "guts". You get quality parts for a reasonable price, a REALLY good ratio, AND easy shifting!!!
Tony, I misremembered there - low gear is 2.75:1. Together with the 3.636:1 in the rear axle we have 10:1 total ratio in low.
Tony, I probably could make use of that gear. I have two of those on the bench about half restored for a guy in east Texas. I have all the machining done on the bushings, have to make a new shifter fork and a few more things. My gears are OK but a new one would be better. firstname.lastname@example.org
Could the internals be modified to make a 2:1 overdrive? Might only be useful with the 4:1 pinion.
Thanks for the information.
I have a Ruckstell for the speedster project I hope to build some time soon. The thought of something you could "bolt up" to a standard ford rear end is interesting in it's simplicity.
But there is a reason why so many Ruckstells were sold.
That would be one really high torque engine if it could push a T with a 2-1 effective gear ratio. It is tough enough pulling a 3-1 axle gear!!!!
Also as I said earlier the mechanism is not designed for really long life through the gears
Les, could you explain what you mean by "really long life through the gears"?Thanks, PK.
i think he means the gears are not intended to do much rotating work while transmitting torque or they will soon sound like a cement mixer.