Project traction - Page 4

Negra · #46 (**permalink**) 06-02-2009, 09:19 AM

Is there a chance the ECM from a Sequoia will work ?
Local Toyo Tech seems to think the mapping is very simular to the Tundra.
He has been advised and should be watching this thread by now ?

Bertsonsracing · #47 (**permalink**) 06-02-2009, 11:37 AM

Could you pelase put a sticky on this tread?

Jowett Engineering · #48 (**permalink**) 06-02-2009, 03:14 PM

As things stand now, the truck thinks it is in 2WD, power is flowing to the front w/o issue. There are differences between the the actuators, which I will get more into depth with as the project is completed. For now I will say that although the connectors will plug in, those differences won't allow things to operate properly... again, more as this develops.

The Seqouia t-case and ecu may well be a better (easier?) swap if the center diff lock button can be added and a few other things are in place, such as the same ecu harness connectors matching etc.

The LX case is the same as the 200, my case actually came from a LX570. Toyota doesn't sell many 200/570 vehicles, but there should be enough that they'll start showing up in yards. The $2700 price for a new case is not outrageous when you factor in the sale of the stocker and such.

Bertsonsracing · #49 (**permalink**) 06-03-2009, 02:08 PM

Could the internals be changed from one case to the other? Meaning could some go out anb buy the TORSEN from a Sequoia / LX750/200 and put it in the Tundra Case?

Jowett Engineering · #50 (**permalink**) 06-03-2009, 04:13 PM

The cases have the same dimensions, things from one case should fit the other. There are bound to be many internal parts differences, and I doubt you could buy just the Torsen and throw it in there. Input shaft, output shaft, shift forks... what is the same and what is different? I have a feeling by the time you get done it may well be cheaper to buy a whole case. Also do note that Toyota added a large amount of cooling fins to the 200 case. Running that front drive chain constantly creates significant heat.

Jowett Engineering · #51 (**permalink**) 06-05-2009, 07:48 PM

This swap is now 99% (I say 99% because I'm still curious what will happen when significant wheel spin happens up front) To reiterate, the truck is AWD when the dial switch is set to the 2WD position, 4WD on the dial locks the center diff, and 4 Lo is still 4 Lo.

The physical changes made to incorporate this case into the Tundra include swapping the rear output flange, swapping some parts from the Tundra transfer case 2WD - 4WD actuator into the Land Cruiser AWD - CDL actuator.... and last are some simple mods to the front differential disconnect actuator that allows it to function while keeping the fork that locks the coupling sleeve to remain in the locked position. No wires or ecu's need to be bothered with.

Exactly one custom part is required, that is a small spacer that holds the front diff actuator shift fork in the locked position on the shaft which it normally slides on. Over the weekend I will snap some pictures and write up some basic instructions on the mods required.

The truck is an absolute blast now... the street manners are much improved in normal driving with the front end pulling a bit. Recomended....

zpaul · #52 (**permalink**) 06-05-2009, 08:48 PM

What a cool stuff.

Now I miss having 4wd for sure!

Gutz · #53 (**permalink**) 06-05-2009, 09:32 PM

As soon as you get a parts list together and have all the kinks worked out.....I am toyally doing this. AWESOME JOB!

Austin Aggie · #54 (**permalink**) 06-05-2009, 10:14 PM

Gutz,

He started with a 4WD truck. I think yours is a 2WD, if I remember correctly. I don't think it can be done with a 2WD truck making it AWD.

sofix · #55 (**permalink**) 06-06-2009, 02:34 AM

Nice cant wait to see some pics and mpg

rangerbrown · #56 (**permalink**) 06-06-2009, 04:57 AM

going to awd from 2wd is easy, i have done two fords although not the same brand/truck the idea is simple

the edge ranger was 2wd but had the same set up as the v8 exploder just swap the awd diff then trans fer case and parts and done.

i would think that with the tundra if the 2wd truck was to see that a front wheel was spinning faster than say a rear it would start the vsc (or what ever it called) to control the wheel spin or reduce power, but as long as the front and rear diffs have the same ratio you should be fine. how ever if you wanted 4 lo or to lock the case you would have to figure a way to wire it. that could (but is not known to me) be as simple as just installing the switches (wiring as well) and sending power to the unit in the case, how ever that ecm would never see it. vsc would not turn off you would have to do that manually i would think.

this is just my opinion but until some one trys theres no need to say it can work.

CACressida · #57 (**permalink**) 06-08-2009, 04:08 PM

Very Very cool!!

ChitownTundra · #58 (**permalink**) 06-08-2009, 05:51 PM

There are some hurdles to make a 2wd into a 4wd truck. Different Front spindles, Drive Shafts, Front Diff, Mounting Front diff, Axles, and then the Computer stuff.

About the only way I would attack it would be to get an entire rolled truck or wrecked truck from a yard.

This is assuming that the 2wd and 4x4 have the same front end frames as well.

It is possible on a Tacoma, but both truck have to be a 6lug set up, and not the 5 lug set up. The 5lugs and 6 lugs are totally different.

Gutz · #59 (**permalink**) 06-08-2009, 06:15 PM

Quote:

Originally Posted by Austin Aggie

Gutz,

He started with a 4WD truck. I think yours is a 2WD, if I remember correctly. I don't think it can be done with a 2WD truck making it AWD.

Anything can be done with enough $$$ and time.....

Skyssx · #60 (**permalink**) 06-09-2009, 12:14 AM

Quote:

Originally Posted by Jowett Engineering

This swap is now 99% (I say 99% because I'm still curious what will happen when significant wheel spin happens up front) To reiterate, the truck is AWD when the dial switch is set to the 2WD position, 4WD on the dial locks the center diff, and 4 Lo is still 4 Lo.

The physical changes made to incorporate this case into the Tundra include swapping the rear output flange, swapping some parts from the Tundra transfer case 2WD - 4WD actuator into the Land Cruiser AWD - CDL actuator.... and last are some simple mods to the front differential disconnect actuator that allows it to function while keeping the fork that locks the coupling sleeve to remain in the locked position. No wires or ecu's need to be bothered with.

Exactly one custom part is required, that is a small spacer that holds the front diff actuator shift fork in the locked position on the shaft which it normally slides on. Over the weekend I will snap some pictures and write up some basic instructions on the mods required.

The truck is an absolute blast now... the street manners are much improved in normal driving with the front end pulling a bit. Recomended....

This is the best thing i've seen on this forum. I'll end up doing the conversion when I hit 60,000 miles. I figure that should be another 4 years or so unless I need to start driving a lot more daily.