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Old June 5th, 2008, 11:06 AM   #1
eswiger
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Doubler for t-18 ?

Has anyone seen any home built versions of a doubler box for off the back of a T-18 trans? I have a model 20 transfer case and several others laying around to make a combo. I have the length so that is not an issue. With the gear input it makes it a little tough. Maybe something I could run off the back of the Model 20. Once my motor goes I'm trashing the drive train so I don't want to invest a lot of cash into the system.
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Old June 5th, 2008, 11:12 AM   #2
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Do you have the 4:1 T-18?
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Old June 5th, 2008, 11:52 AM   #3
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Do you have the 4:1 T-18?
Don't think so, no.
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Old June 5th, 2008, 12:47 PM   #4
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If you don't have the 6.32:1 T-18, that might take care of the issue right there.

Next, a divorced 205 comes to mind since you said you had the length for this.

If you have a Dana 18 sitting around, you can use some of its internals to make your 2:1 Dana 20 lower. Google for more info on this swap. Or, you can just buy the necessary gear kit on the aftermarket to take it to 3.15:1. If you do that and add a 6.32:1 T-18, it would be a significant improvement.

By Googling, I also found this link that might help you, but it was blocked at work: http://www.pirate4x4.com/tech/billav...ler_signed.pdf

I also found sites that indicate Ford Dana 20's can be doubled. I'd spend some time Googling to see what your other options might be.


Lastly (and the least relevant to your requirements), you could plan on replacing your Jeep motor with a reliable one, buy a nice adapter for your T-18 (Novak?), and add a CJ Dana 300 with 4:1 gears in order to keep the drivetrain short.

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Old June 5th, 2008, 01:51 PM   #5
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I also found sites that indicate Ford Dana 20's can be doubled. I'd spend some time Googling to see what your other options might be.
yeah, double ford dana 20's was referred to as the 'cold duck' if that helps in searching, but I haven't heard much about them in quite a few years. I don't remember who did it to say if the company that did it is still around.
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Old June 6th, 2008, 11:51 AM   #6
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The T-18 trans is the 4:1 first. I do have a couple model 18 transfer cases and considered swapping the gear into the model 20 but it wouldn't get me low enough. The motor is still very reliable but a 401 wouldn't be my next choice neither would the T-18 trans so for now I'm just trying to get a doubler set up. I'll check Wild horse to see about a Ford model 20 Doubler. Maybe I could set up my dana 300 as a divorce much liter than the 205 and better gearing. Thanks for the suggestions if anyone ses something let me know.
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Old June 6th, 2008, 06:41 PM   #7
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The T-18 trans is the 4:1 first. I do have a couple model 18 transfer cases and considered swapping the gear into the model 20 but it wouldn't get me low enough. The motor is still very reliable but a 401 wouldn't be my next choice neither would the T-18 trans so for now I'm just trying to get a doubler set up. I'll check Wild horse to see about a Ford model 20 Doubler. Maybe I could set up my dana 300 as a divorce much liter than the 205 and better gearing. Thanks for the suggestions if anyone ses something let me know.
You know what's lighter than a Dana 300?



Swapping the T-18. Adds no weight at all and requires no driveline changes.
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Old June 6th, 2008, 07:50 PM   #8
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You know what's lighter than a Dana 300?



Swapping the T-18. Adds no weight at all and requires no driveline changes.
Yeah, but he's not the most conventional of folks... after all, this is an S-blazer we are talking about.... with an AMC 401 in it.....


Although, yeah, Going to a 6.32:1 first gear, along with putting the dana 18 2.46 gears into the Dana 20 will lower your gearing by about 90%.

With the width of the gears, and the torque of the 401, I think this would be just fine.
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