AWD conversion completed

106467 Views 306 Replies 71 Participants Last post by WNC Tundra, 2 mo ago

ViktorG

Discussion Starter · Jan 14, 2016 (Edited)

7

I guess this could go into the driveline section, but to me it is definitely a performance mod.

Those of you with supercharged trucks and those with stock trucks in cold/snowy climates know how hard it is to get any traction in 2WD on take-off. I have an S/C truck in Canada, so I find that most of the time, if I want to race somebody, I have to quickly shift it into 4WD, otherwise most guys easily get a jump on you. That is all fine and well, until a corner comes up and you start running a risk of damaging your driveline on dry pavement. Also, once you kick someone’s butt, you are likely going much faster than 60 mph, so now you are stuck in 4WD, and if you are on a highway, it is not very convenient to slow down to shift back to 2WD. Even during daily driving, when there is a lot of snow/ice in the neighborhood, I always use 4x4 to get out, and then once you hit the plowed road, you have to switch back again, so another inconvenience.

For these reasons I have been wanting to add AWD option to my truck for some time now. I have seen a guy named BJowett on the forum who installed a Landcruiser T-case into his truck and he was my inspiration. Finally I had a few bucks in my pocket, and after doing my research, I ordered the transfer case I wanted. I decided not to go with the JF2A transfer case found in the Landcruiser and the LX570 because it is a full time transfer case with no option of 2WD, so instead I went with the Torsen LSD equipped multi-mode JF3A t-case found in the 2008+ Sequoia. That transfer case has all the options you can ask for: 2HI, 4HI free, 4LO free, 4HI lock and 4LO lock. So now, when I am driving somewhere in the summer on the highway, I can have it in 2WD and save on gas, if I am driving in winter or wanting to race somebody, I can put it in 4HI free, and when I go off-roading I can lock the center diff and have it in 4HI lock or 4LO lock.

Here is the video of the system operation:

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261 - 280 of 307 Posts

Mike12086

· #261 · Jan 29, 2019

2 questions:

Is the 4WD ECU VIN locked or can one be pulled from a junkyard and used?

With all the talk of the Sequoia front driveshaft has anyone looked at the Sequoia rear shaft to see if that fits either tundra configuration?

Wynnded

· #262 · Jan 29, 2019

Mike12086 said:
2 questions:

Is the 4WD ECU VIN locked or can one be pulled from a junkyard and used?

With all the talk of the Sequoia front driveshaft has anyone looked at the Sequoia rear shaft to see if that fits either tundra configuration?

1) Nope. My 4WD ECU was from the same vehicle as the T-case though I still don't believe they are, I'm sure @ViktorG can confirm.

2) The Sequoia rear drive shaft is too short.

ViktorG

Discussion Starter · #263 · Jan 29, 2019

Yeah, either a new or used 4WD ECU can be used and it does not need to be paired to the vehicle in any way.

Reactions: 1

ZoSo

· #264 · Jan 31, 2019

Badass ViktorG !! Nice work.

Reactions: 1

ViktorG

Discussion Starter · #265 · Oct 8, 2019

I've made a little video of the synopsis of the conversion and the 5 modes of the transfer case operation for anyone interested:

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TallenTundyCM

· #266 · Nov 13, 2019

This is an awesome MOD. I just completed my AWD conversion on my 11' CM....Love it. I am having trouble getting the CDL switch back light and indicator LED light to illuminate. The switch activates the Center Diff perfect.

Any help or suggestions would be greatly appreciated.

I wired the CDL switch.....
#6-Ground
#7-neg
#8-positive
#9-4WD ECU pin #12

Per other post on this thread I taped into a positive (green) from another switch in the dash and a yellow (negative) from the another switch.

The only difference with my truck is it has a bench up front with a column shift lever so the Tow/haul switch is not easy to get to.....not sure if the coloring is consistent with other switches in the dash.

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ViktorG

Discussion Starter · #267 · Nov 26, 2019

TallenTundyCM said:
This is an awesome MOD. I just completed my AWD conversion on my 11' CM....Love it. I am having trouble getting the CDL switch back light and indicator LED light to illuminate. The switch activates the Center Diff perfect.

Any help or suggestions would be greatly appreciated.

I wired the CDL switch.....
#6-Ground
#7-neg
#8-positive
#9-4WD ECU pin #12

Per other post on this thread I taped into a positive (green) from another switch in the dash and a yellow (negative) from the another switch.

The only difference with my truck is it has a bench up front with a column shift lever so the Tow/haul switch is not easy to get to.....not sure if the coloring is consistent with other switches in the dash.

The green and yellow wires for illumination apply ONLY to the tow/haul switch.
Other switches all use different color wires.
On the tow/haul the green is ill+ and yellow is ill-, but some other switches have yellow as ill+ etc.
Let me know which switch you are tapping into and I'll tell you the wire colors for the illumination circuit.

Reactions: 1

TallenTundyCM

· #268 · Nov 26, 2019

ViktorG said:
The green and yellow wires for illumination apply ONLY to the tow/haul switch.
Other switches all use different color wires.
On the tow/haul the green is ill+ and yellow is ill-, but some other switches have yellow as ill+ etc.
Let me know which switch you are tapping into and I'll tell you the wire colors for the illumination circuit.

Thank you ViktorG! I was able to find the appropriate wires.....now it works perfect.

Reactions: 1

azTony

· #269 · Mar 1, 2020

Do you know what the options are for a 2018 Tundra upgrade? Do the newer Sequoias have the same transfer case and swap capabilitie?

Wynnded

· #270 · Mar 1, 2020

azTony said:
Do you know what the options are for a 2018 Tundra upgrade? Do the newer Sequoias have the same transfer case and swap capabilitie?

This can not be done on 2014 or newer trucks. The T-cases are completely different. The Sequoia still uses the same T-case as the 2007-2013 Tundras, that's why it works.

Reactions: 1

nighttowl

· #271 · Jul 29, 2020

2

I was planning on doing this tomorrow, but I noticed that my sequoia t-case has a crack in the plastic for an electrical connection.
Should I be concerned about this - or can I just seal it with epoxy and be good to go?

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ViktorG

Discussion Starter · #272 · Jul 29, 2020

nighttowl said:
I was planning on doing this tomorrow, but I noticed that my sequoia t-case has a crack in the plastic for an electrical connection.
Should I be concerned about this - or can I just seal it with epoxy and be good to go?

Epoxy that thing

nighttowl

· #273 · Jul 29, 2020

Thanks!

ViktorG said:
Epoxy that thing

Reactions: 1

Wynnded

· #274 · Jul 29, 2020

nighttowl said:
I was planning on doing this tomorrow, but I noticed that my sequoia t-case has a crack in the plastic for an electrical connection.
Should I be concerned about this - or can I just seal it with epoxy and be good to go?

ViktorG said:
Epoxy that thing

I was going to say the same thing, then go back as soon as you can with some dielectric grease and put it in the connection. Maybe go back after some wet days to give it a check until you're satisfied that moisture isn't getting in there.

Reactions: 1

RIjon

· #275 · Jul 30, 2020

That seems like a great candidate for flex tape

nighttowl

· #276 · Jul 30, 2020

I just picked up my modified driveshaft and new seals.
for the sequia transfer case - do I need to use gear oil with a traction modifier?

nighttowl

· #277 · Jul 31, 2020

workign on electrical now.

nighttowl

· #278 · Jul 31, 2020 (Edited)

2

I have a problem and need help.

Pin 14 on the A25 connector for the 4wd ECU already has wire in it.
not sure what to do - splice or replace?

Truck is 2010 5.7 4wd double cab SR5

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ViktorG

Discussion Starter · #279 · Jul 31, 2020

nighttowl said:
I just picked up my modified driveshaft and new seals.
for the sequia transfer case - do I need to use gear oil with a traction modifier?

No, just 75w90 oil without any friction additive

Reactions: 2

ViktorG

Discussion Starter · #280 · Jul 31, 2020

nighttowl said:
I have a problem and need help.

Pin 14 on the A25 connector for the 4wd ECU already has wire in it.
not sure what to do - splice or replace?

Truck is 2010 5.7 4wd double cab SR5

You splice the ground side of the centre diff lock indicator LED into it

Reactions: 2

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