Twin Stick Transfer case

There is no cause for you to get all defensive and hostile over this.

It is very very dangerous to say that something is impossible.

From the picture that I left in the quote, I will grant that it is a little different, but by no means difficult, and certainly not impossible.

So both forks slide on the one stationary shaft, the moving shaft moves both forks. The two forks fit into their respective holes in the front and back halves of the case.

From the pictures I can see of the cases, I can see where it would be possible to continue the hole for the stationary shaft outside of the case. I can't see if a similar extension of the hole could be added to the front half, or if this would require a bracket and additional support out the back of the case in order to support a sliding shaft in place of the stationary shaft. There seems to be a stopper that keeps the stationary shaft aligned.

Now there is a VERY simple way to make this modification (I was about to say "easy", but it would require a bit of work, so simple works better);

Remove the stationary shaft, get a longer shaft of the same diameter, drill out stops, add bushings and seals, affix one of the forks to that shaft leaving the other free, affix the other fork to the other shaft. Now when you move one of the shafts, it moves one of the forks. Move the other shaft, it moves the other fork. I'd be inclined to use snap rings to affix the forks to the shafts.

Your first objection to the manual shift mechanism is actually a trivial one to solve: that would be just adding an oil seal where the shaft comes out of the case.

Your second objection about it jamming up should be solved by reworking the shift rails as I've described above.


And yes, I absolutely agree about the need to keep the H/N/L from jumping out of gear into neutral. I can think of several different approaches to this. The first that comes to mind is the common spring/detent/ball approach, but rather than between the fork and the shaft, between the case and the shaft.

 

sub'd

 

Pass the potato chips Mr. Mayor.


How reliable to you suppose that setup on the tacoma t-case would be shemp?

 

That is limited only to how well you implement it. If you use a hacksaw, flat screwdriver, hammer, and duct tape to implement it, obviously you can expect a failure, sooner rather than later. If well implemented with high quality stainless steel hardware and brass bushings, it should be more reliable than the existing electronic unit.

 

<---- Wants an FJ case with twin sticks badly.

 

That's assuming that you happen to be one to be on the "trails". I highly suspect that most people's trail repair kit does not include internal parts to a transfer case, so keeping a spare case with you in those circumstances would seem to apply equally either way.

You also severely underestimate the number of far far more significant one-off custom rigs that run the trails. Most certainly do not carry spares for every single custom part.

The R&D would be a much more significant expenditure if you were going at this from a mass production standpoint. As a 1-off, it actually wouldn't cost that much. It could take a little while, but at least it would be fun work. IMO, the most rewarding part of customization and offroading is in the actual process of customization. The work you do on the truck. The more pure the customization is, the fewer people have done that before, the more rewarding it is to complete it successfully.

As for running a twin stick FJ case, sorry, but that would definitely not be all oem parts. Toyota makes FJ cases SINGLE stick. The twin stick modification is all aftermarket/custom. If you wanted to just do a manual single stick case out of a Tacoma, that would be far far easier, since all you'd have to do is remove the electronic actuator, seal the shaft to the case, and rig up a relay. Of course, it could still jam up like a Tacoma case does.

 

Here is mine. Wyatt and I did mine last year. Twin stick and crawl box. Yes I still need to dial in the rear boot base ... I'm lazy.

Wyatt is great - great guy, great knowledge, everything. We can all talk about theory on how we think we can get a tacoma case to a twin stick state but the reality is, the amount of work and engineering would far outweigh the cost of picking up an FJ case, make a few "simple" mods and bolt her in. No reason for anyone ot get in a pissing match - if you can do it, then by all means do it an post the results, talk is cheap. I on the other hand went the route that will be less prone to failure then re-inventing the tacoma t-case. while I agree nothing is impossible, time and money anything is possible - but when there is a more logical, simpler and reliable way to do it, who cares...

 

I tend to agree

For you, NOTHING is possible

 

Having been proven wrong over 35 thousand times, you'd know more about that than me.

 

Why would it be prone to failure? And those would be internal parts.

What is the chance of a stainless shaft about 1/2" diameter breaking? That is what I'm proposing changing on the existing transfer case. That, and adding a couple of oil seals.

FYI: There are lots of c-clips, seals, shifters, etc., that seems you might classify as "extra junk" that **IS OEM** and part of the existing transfer case.

Finally, do, please, go back and look at how involved the twin stick modification is. There is considerably more about it that is "non-OEM" than you are acknowledging.

Every part that is altered, every part that is added, every part that is removed... ALL of that is non-OEM.

What makes OEM so god-like that it can't possibly be done differently and be just as good (or even better)? If OEM was so god-like as you seem to be suggesting, then why should anyone make any modifications at all and not just leave it all factory?

 

Your 'derp'? I can assure you, I have no interest in your 'derp'. You can keep your 'derp' to yourself.

 

??? I wonder just what the hell kind of drugs you're on...

 

Ok, that's fair and makes sense. My points are more theoretical than an actual suggestion to go ahead and do it. One of the reasons why this could, under certain circumstances, be a viable option, is that FJ cases might not always be as readily available as they appear to be at the moment.

 

Ok, enough now, let agree to end this, it certainly isn't productive.

Deal?

 

Ok then, you're now on my "ignore" list. Thank you, have a nice day.

 

wow this thread got dumb all of a sudden

 

fixed

 

What are the ratio differences between the stock case and the twin sticked FJ case. Final crawl in 1 lo for each
This sounds like a mod I would be into
thx