Double Transfer case question

[Shipwreck]

I have heard several people make reference to twin transfer cases...what is the advantage of this.. would it work similar to the Atlas II or am I really showing my inexperience here? The reason why I ask is because I have an extra transfer case for my project vehicle, and depending on the benefits, it may be owrth hooking everything up in some frankenstein-kind-of thing

 

[Brian1]

The benifit of hooking 2 t-cases together is that it gives you a better low range ratio to crawl with. You would probably have to run it divorced which means you would need a small 3rd driveline to connect the two plus front and rear driveline modifications. Also some sort of mount would have to be fabbed. Hope this helps.

 

[Shipwreck]

So it would link together roughly as follows....
engine to transmission to transfer case..rear output of that case into the second transfer case and then the outputs from the second transfer case would be where the driveline connects.....so I could be regular 4 low and then "kick in" the in-line second transfer case (first in linkage) and then the tourque / ratio would multiply at that point.....similar in thought to doing the ultra low gearing on the Atlas II or the Tera-low kit.. am I correct in my thought process so far..... it sounds good to me

 

[410Fortune]

yup thats about right except you have a ton of options, the first case can be in high range and the second in low range with your tranny in 1st, so basically you have a ton of gears and a way low crawl ratio.......


Now I saw the other day there is somebody building a splitter for our BW T cases that looks rather good, only takes up 8" and bolts tot eh back of your stock case....wish I had the link...

 

[FMExplorer]

TCase doubler

Here ya go!

J

 

[Shipwreck]

Thanks guys...interesting site, but it looks as though they are selling an additional transfer....I already have two transfers, I just want to link them together.

 

[410Fortune]

It's not an additional transfer case, it's a modified 1/2 case thats made to bolt onto yours.

Now There is a nutcase out there that has bolted two BW 1350 manual shifts together, I think you can find the write up at
www.therangerstation.com

 

[Shipwreck]

Rummaged throught that site and did not find the info. I have one manual shift and one electronic shift.. I was going to put the manual in the rear of the linkage (more reliable) and then figure out the shift linkage. I could just take an output shaft from a transmission down to a driveshop and have them weld a flange on the other side so it would mate with the rear output from one transfer case and into the input for the second transfer case...just an idea, this idea all came about from Rick's barbecue when I was talking to Rockranger.... I would like to make it work somehow, but want it to be trail tough ( I break everything) yet cost-effective at the same time... I am drooling at the calcs of what my ultra low crawl ratio would be....hehehehe

 

[soupbone]

question

with a auto how do you stop the vehicle with 4LO 6.15:1. wouldnt it be like a unstopable creep....? i think a atlasII 3.8 or 4.3 would be stronger and better. but $$$$.

 

[410Fortune]

Dude you could be at like 4500 RPM's and doing 3 Mph, thats the point though isnt it?
you dont have to stop, your not going fast enough to hit anything.


It'slisted under transfer cases, called double transfer case swap or somethinglike that, here's the link:


http://www.therangerstation.com/dualtcase.htm

 

[Shipwreck]

Like a tank.....or like spiderman........or through real thick mud........or recovery operations, plenty of reasons, just becasue it is available doesn't mean I would have to use it all the time, and yes you are correct.....stopping it while in ultralow would present a problem.......that is why there is neutral

 

[410Fortune]

why is stopping in ultra low a problem? You guys dont think the brakes would do any good?

 

[CONavajo]

I just helped my friend do double Toyota case. The older Toy's had super tough gear driven cases. The stock low had been switched to a Marlin 4.7:1, (which I also ran in my Toy) and it ruled but now he has the 4.7 plus the stock low of around 2.4 or something so it will pretty much idle up stuff.
Marlin and the Toy guys always showed off on the trails by getting out and walking alongside these super low trucks as they climbed. One bad thing is you can blow your clutch up if you drop it hard in super low, which can injure the passengers if the tunnel isn't reinforced.

Keep in mind these insane crawl ratios work best with a manual tranny as an auto's torque converter will help a moderately low t-case tremendously, like an Atlas.

 

[Jason_25]

Originally posted by 410Fortune
why is stopping in ultra low a problem? You guys dont think the brakes would do any good?

I'm fairly sure the stock brakes would be overpowered by the ultra-low ratio.

 

[410Fortune]

SO then if we've gone to all this trouble to build this monster dual case setup why not throw in t a driveline brake?

I'm planning to make my parking brake into a driveline brake, using motorcycle parts, eventually, similar to what is out there for Toyota's (aftermarket).

This cable operated caliper would mount right on the output shaft of the BW 1354 T case, of course a bunch of custom fabrication is required, so it may be a while, I'm just sick of the stupid Ford drum parking brake thats in my disc brake 8.8, of course driving 1/4 of the top of the world trail in Moab with the parking brake set doesnt help......

 

[Shipwreck]

I have heard that some people with the Atlas II and other ultra low gearing sometimes have problems with the vehicle still creeping forward with full brake pressure applied......manual trans or neutral are ways around this........

 

[soupbone]

Well newer EXs do have F/R discs hrmm.. maybe 4.3 atlas would work.

 

[Shipwreck]

Driveline brake is excellent idea.......convert to disc in the rear and run the parking brake to the driveline..
Excellent idea.......oh how the wheels are turning now...

 

[soupbone]

Dead Link Removed

this is from a toy but a good example. but bolts on the back of the TC. no driveline mods needed.

This parking brake kit hooks up directly to the stock parking brake cable. This kit provides dramatically increased braking over the stock parking brake. Will hold truck on a 45 degree hill (tranny in neutral). Kit bolts onto the back of the transfer case, no drive shaft modifications needed.

 

[Randall]

Yep, I was just talking to Jess at High Angle Driveline last week about the driveline brake, and he said he could easily make it work with the emergency brake cable, which in my case hasn't been hooked up since I lifted it. He also said that he could get it to work with the regular brake system as a compression type brake. I was thinking about doing this with the emergency brake with an atlas 4.3 install and an automatic, but I don't know how 'convenient' it would be to press and release the emergency brake and lever every time you used it.