Let's see your FJ case swap

Ohhhh man.

 

Forgot a cutting wheel so a stepper bit and side cutters had to do..don't worry gonna clean it all up tomorrow. But it's in. Test drive without front driveshaft and everything is good so far. Now just gotta do the wiring and this turd should have 4lo again

 

This time around I used a new 4Runner case instead of an FJ case. The new trail editions us the same j-shift transfer case as the FJ's if anyone is looking for one.



If you have a manual transmission you'll have to swap the output gear from your tcase to the 4Runner case. The FJ cases have the gear in place even though it's not used.

 

What is that bottom picture of? I used a 4runner case and saw nothing of the sort when I broke it apart? Why did you swap from the fj to the 4runner?

 

worm gear for speedometer, used by the guys that still shift gears like men.

 

That's the speed pickup for the manual transmission trucks.

I goofed on my first twinstick install and that ended up with the syncro keys landing in the chain and causing issues. I pulled the new case fully apart the second time around instead of trying to do it the "easy" way.

 

I shift like man...

But I didn’t have to swap any worm gear for my 4R case and my speedo works fine... confused.

 

Likewise, never seen that in any install thread.

 

You should not have to swap the worm gear, just the sensor. The worm drive is already in the automatic FJ cruiser transfer cases.

 

So what your saying is when SMKYTXN, redid his case he found any 4runner case which happened to be a manual, which was fine considering he already had the planetary gears, but since it was a manual he had to put the worm gear in as well?

 

The only swap I’m aware of is the input shaft from the 6 speed Tacoma into the fj/4r cases.

To clarify, every case is manual shift for these swaps. There is no manual transmission 4Runner after 2001 and the manual transmission fj tcase are incompatible with Tacoma’s without much much more modification.

 

The worm gear is in all of the FJ cases, but it's not in the 4Runner cases.

The 4Runner was an auto, like all of them. My case is behind a crawlbox so I didn't have to swap out the planetary to make the FJ case work. I only had to put the worm gear into the 4Runner case so I could use my speed sensor from my manual transmission taco.

 

Oh yeah, duh. 5th gen 4runner with a manual......hahhahha. So I might be beating a dead horse but if you say the worm gear handles the speedo and the fj cases have them but not 4runner, how come my 4runner case works just fine? Or have I seriously overlooked something?

 

Interesting, that's good info!

I don't know when toyota started using the ABS sensors vs. transfer case output. But I know from 05-10 tacomas the manuals use the speed on the t-case output. Perhaps I see you have a 2014, toyota went back to the ABS sensors even on the manuals? If you don't have a harness that would plug into the speed sensor at the back of your t-case then that would verify it, or a simple look at the wiring diagram for a newer model tacoma.

In the attached schematic, this one is for the older tacomas 05-10, and the area I circled in yellow is the speed sensor in the back of the t-case, you can see there's a specific note for manual transmissions only (M/T)

 

Rgr, thank you for the eduation. Guess I just got lucky with my year truck and just so happening to go with a 4runner case because I had no idea. L

 

SHIFTING ON THE FLY QUESTION

primarily for those who see snow at highway speeds...

i've noticed (and a heads up from @n0rth) if you engage the ADD first, then shift to 4wd, there is a nasty clunk... vs if you shift the tcase to 4wd first, then engage the ADD, the engagement is smooth. theory/thought is the front shaft gets spinning at wheel speed before engaging ADD vs having the front shaft play catch up..

i've only done this at moderate speeds on the trail however...

well winter is coming... heading up the mountains, i like to stay in 2wd as much as possible, but when conditions deteriorate, it's nice to be able to shift on the fly and not have to pull over to slow down and engage 4wd...

what's people's experience with shifting into 4wd on the highway? any tips?

one of the few benefits of the electronic tcase was the ability to shift into 4wd at highway speeds... this will be my first winter with the FJ Case..

thanks

 

The nasty clunk is the front driveshaft being slapped into spinning by the ADD. If you engage the TC first, the driveshaft will be spinning at speed but not 'connected' to the drive wheels due to the ADD. After engaging the TC, then engage the ADD. That's how the shift on the fly systems with a front axle disconnect are designed to work.

 

that's what i was picturing in my head as well...

so the question is, doing that method of tcase>add, is there a speed that is "too fast" to be engaging the system?

 

When the ADD is engaged the front driveshaft is spinning though. Wyatt at RST has explained on multiple occasions that the correct way is to engage ADD—>shift into 4wd. I tend to believe him as he's probably got the most experience of anybody with these cases.

The only time I’ve had a clunk is when I’ve engaged the front ADD while moving in 2hi.

 

@NYCO
For winter time driving I left the ADD engaged and shifted the transfer case in and out of 4wd at any speed with no issue, when I knew I had no need for 4wd I would disengage the ADD.