2nd Gen Tacoma 4.6 V8 1UR-FE and GX powertrain Swap

Well I got the blower motor working, hot/cold blender works. However my air direction selector and recirculation worked for about 5 minutes and now they don't. All of my grounds are connected, I hope I didn't fry anything. I checked fuses from my power sources and I didn't pop any of those. I am kind of puzzled about this.

Here is the recirculation working.

https://youtube.com/shorts/cCe1P4itcsM?si=kFftbUEsItUzJcQk

 

So, I'm trying to wrap my head around just simply swapping a 1urfe into a 1grfe/a750f engine bay.

Sounds like, the transmission would be retained with the bellhousing being swapped to a 1urfe. New engine mounts as OP has done here. Mechanically, this would be about all the changes?

Then, the 1urfe ecu from the donor would replace the 1grfe ecu and the tacoma chassis wiring harness would need to be depinned/repinned into the 1urfe harness plugs?

Am I missing anything?

Theoretically, a 2013 1urfe would be easier to swap into a 2013 tacoma because toyota likes to keep wire patterns/colors similar.

 

I swapped everything from a Lexus GX460. Including the a760f transmission, front diff, brake booster and all of the wiring along with the ECUs.

 

Your using the Tacoma HVAC system and controls correct?

 

I understand what you've done here, I'm trying to figure out what would need to be done for those of us who would only be swapping the motor. Seems very doable to do only the motor.

 

Yes, soldered all the pink ignition wires on the tacoma ac amp diagram to this blue 10 amp ignition source. Additionally I grounded all grounds and connected the switches. Also I connected the red wire pin 24 on the AC amp to the same source ignition source. It doesn't appear like I fried anything in the AC amp. I am going to double check my grounds. Whats weird is that the temperature control servo works but the other two don't.

 

The bell housings are different and the starter is on the opposite side. If you solve that issue, you're going to figure out how to control your AT transmission. Manual would be cool but you're talking making a custom harness and aftermarket ECU. Additionally, there is very limited aftermarket support for these. The 2UZ VVT-i would be an easier swap since it uses an A750F transmission.

 

I believe the 1UR A760F bellhousing should probably bolt onto an A750F, but you're right about transmission control. There was never a 1UR with a 5-speed, so that'd be a custom setup. Probably easier to just use the A760F.

Jeff

 

Go to the servos and see what your missing.
https://www.tacomaworld.com/threads/2nd-gen-information-diagnostics.784008/#post-28042158

 

This will definitely help, thank you.

 

Thanks. This is what I've been trying to figure out.

1UR with the a760f seems like it would be preferable over the 2UZ with the a750f. My question for the OP, which perhaps I've overlooked the answer, would be:

Is the a760f the same overall length as the a750f? Then, are the Tacoma CV shafts the same length as the GX? And what about the driveshaft?

I can make custom lengths/splines, but I'm trying to understand the scope of the swap without doing all the extras OP has done. Wiring is a hurdle I'm not too concerned with and have the ability to produce a swap harness.

 

The front diff should be located in the same spot as the Tacoma, and the diff to shaft interface is the same for both. You'd use the original Tacoma shafts without issue.

Jeff

 

Yep Jeff is correct, the front diff housing is the same with the exception that the lexus diff is non ADD since the transfer case is AWD. I used the lexus CVs mainly because my tacoma CVs we worn out. As far as drive shafts I was able to use the front shaft from the GX. The rear shaft I has to get my old tacoma 2 piece get converted into 1 piece, resized and new u joints put in. The gx460 driveshaft is basically a disposable shaft, they friction weld the flange to the tube. The guy at the drive shaft shop did not want to rework that one. I suspect it is very hard to get those welded and concentric once you cut it apart.

 

When will the truck be drivable?

 

It drives now, just not roadworthy yet.

 

I forget, was there anything wrong with the original engine and trans in the Taco? (Aside from the 2-300k miles)

 

The engine wasn't original and is now sold. The transmission wasn't shifting into 5th gear. It could've been a simple fix but I scrapped it already. I don't have time to deal with it.

 

Today I checked continuity on all the grounds in the ac amp diagram and they all check out. I disconnected the power to the ac amp, set the mode selector switch to "face and feet" reconnected the power and everything works. Additionally I observed that last time the servos got stuck on windshield defrost. I suspect it got stuck because I don't have anything hooked up on the AC side yet. It was probably waiting for an ac signal of sorts. I think I read that on @Dm93 page somewhere. Anyway, the mode selector works fine on "Face", "face and feet", "feet" and recirculation works again.

 

Working on getting the AC lines sorted out. The lines to the rear gx ac evaporator need to be capped off and the fittings to the tacoma evaporator need to be soldered on the gx lines. Also I noticed the gx AC pressure sensor has 3 pins where the Tacoma just has a simple two pin ground circuit. I am just going to use the tacoma pressure sensor since I am using the tacoma AC Amplifier. I will use existing wires though just so that it's cleaner.

 

Keep up the good work Denis. Rooting for you man