92Yoda

Hey Im looking into swapping a 2jz in my 92 4runner but i wanted to start with axles and suspension first, I was thinking of doing a sas swap but have decided to stick with IFS and upgrade it (cue the bashing). I will only keep IFS however if the front differential can handle the 2jz in the long run or any higher powered motor for that matter, which i doubt so I am here to ask if there are any front differential options in the aftermarket? Or with higher powered motors is my only option to SAS to handle the power? Im sure this question has been answered before but im here to ask it again, any info would be appreciated

MudHippy

Supralux 8" Front diff upgrade - It Is Here!!!

rattlewagon

If its got high miles, new bearings and a solid pinion spacer are probably the best thing for it.

BoredOutnJackdUp

But it says you want to sas in your sig?

92Yoda

Yea ive since changed my mind about that since i put that in my sig, i should probably change it lol

92Yoda

So it seems the only option is a supralux rear end? I should also mention im planning on running LT suspension and 35's or 37's

BMcEL

highonpottery

iTrader: (1)

i am no engineer, but i would assume the stock diff can handle a stock 2jz's power in most situations - plenty of people swap v8s with more power into their rigs, it just depends on what you're doing and what purpose you're building it for. the problem lies with binding up the drivetrain and giving power in a high traction situation (like crawling) that will cause parts to start breaking. making sure that thing has all the available options of making is stronger will definitely help, but aren't a guarantee - solid pinion spacer, new bearings, non-ADD axles, etc. will all help. the most difficult part to overcome would be to deal with the rotational mass of a 37" tire - i think your weak link is going to be inner axles and CVs because those tires are just darn heavy!

so i think it really comes down to what you're planning on doing with the rig. if you're crawling and doing a lot of high-traction driving in 4wd, then obviously you're going to break lots of parts and a SAS or other differential solution may be in your future. if you're just looking for an overall trail runner and aren't doing the hardcore stuff, or are just being smart and not abusing the setup, you'll probably be fine - just keep lots of spares and practice installing them -- this will be a much cheaper solution since plenty of stock spares are available for very cheap, you won't have to spend extra $ on a custom setup that may or may not work - and it'll give you time to observe the setup and save $ for another solution should you need to make changes.

that's just my opinion - leave it stock and see what happens.

92Yoda

It wont be a crawler, theres no terrain like that where i live, so i would prefer to keep the IFS, ill get an SAS when i know i need it. I thought id do suspension first to prep for the engine swap so te engine swap was the last thing i would do, but ive also been told to do the engine swap first and run the axles till they break.. Which would be cheaper but im not a fan of inconvienences when they couldve been preented, which do ppl think i should do first?

MudHippy

There's no way in Hell an 86-95 7.5" front diff is going to hold up under a V8. When it can't barely hold up under my 3VZ-E(and many times can't). A 2JZ-GTE then is, by default, too much for it to handle.

A V8 isn't too much for a stock IFS front diff? Seriously? Man, that must be some good pottery you be smokin'! Either that or you've just never wheeled yours hard enough to know how easily they fail. Or...wait a second.. I just noticed your rig has a 22R-E. So nevermind. That answers that. You just don't know what it's like to have enough torque to break one.

92Yoda

^^^^ lol yes ive heard good things about toyotas IFS, but nothing good about the 7.5 dif, supralux it is? Keep the info comin!!

xxxtreme22r

A 2jz-GTE puts out roughly 227hp/330ft-lb.
A 2jz-GE only puts out 220hp/220ft-lb.
A 2jz-FSE only puts out 217hp/216ft-lb.
A 5vz (which has been put in many IFS rigs) puts out 190hp/220ft-lb.
A 4.3l (which has been used as well) Chevy puts out 160-180hp/230-235ft-lb
A 1uz (how many on here have put these in IFS trucks?) puts out 256-261hp/260ft-lb or 290-300hp/300-310ft-lb depending on which flavors you end up using.

My question to the O.P. is which 2jz we talking about here? As it seems EVERYONE has assumed a 2jz-gte and not a 2jz-ge or a 2jz-fse. But even then, I counter with the 1uz and/or 5vz.

And I will also add this:

There's an IFS v8 mud truck that runs some of the bogs out here without any problems. I'd be more worried about the CV's handling the power then the diff itself.

highonpottery

iTrader: (1)

^Exactly what I'm saying!

All I did was suggest that he figure out what he wants to do with the rig once it's finished because basically none of this info was provided, and to test the waters out with an inexpensively beefed stock diff before going on a spending spree with a custom setup that still might not be able to handle the power and tire combo. Already, 92Yoda has stated he will not be crawling - this alone has an influence on the success of this pairing.

All I'm claiming is that plenty of people swap engines with more hp into their rigs and are successfully driving around with stock diffs. sure, I can definitely break the stock IFS with a 90hp 22re if I wanted to and that has nothing to do with the fact that I "just don't know what it's like to have enough torque to break one", but because it all depends on what you're doing and how you drive the rig that will determine how successful your drivetrain is going to stay together. the 2jz engine has around 220hp, the popular 3.4L V6 swap is close to 200hp, WAY more power with either of those vs stock engine, and those rigs are fine under the right conditions. again, plenty of people decide to swap a v8 under the hood - something like a 1UZ has around 250hp and again depending on what you're doing your rig CAN be totally fine. If you just wanna troll around and rip on others' advice so be it, but at least come with some constructive criticism that's relevant to the thread instead of just ripping on things that have absolutely nothing to do with the topic

James Woods

iTrader: (1)

I would have to agree with xxxtreme, the CV's will be the weak link in the system and most likely wont harm the diff until the CV's no longer are the weak link, which depending on how you drive will most likely need upgraded.

xxxtreme22r

And you always have the option of going with an aftermarket gear set that will be stronger then the OEM gears. Not sure if they make cryo-treated gear sets or not for these. But certainly someone makes a stronger gear set.

Also and I hate to send you to a different forum but....I am sure there are 2jz-??? powered 2wd mini trucks rolling around. Don't forget those 2wd trucks have the 7.5 gear set in them. And those see much more punishment then an IFS front diff does as your only using the front diff when in 4wd.

The only big difference is going to be the tire size. With a 22re and 35's the CV's have a tough time holdling together, especially if your running a locker in the front.

I think most of the diff failures, that I have seen anyway, have been from either 1 improperly setup diffs, or severely worn out gear sets.

Think of it this way, you can get quite a bit of power out of these 22r's when using forced induction, but you can't just go and slap a 15 psi turbo on an engine that has 140,000 miles on it and expect it to hold together.

Greg_Canada

2jzgte's put out waaaayyy more than 227hp lol, try 300 easy.

92Yoda

Sorry for not specifying, its the 2jzgte. I originally wanted a 1uz but decided i already have 2 other v8 vehicles and do not want another, ive also READ that the 2jz gets decently good gas mileage considering the specs and depending on driving habit. Does the 1uz have forged internals? I wanna say the 1uz has an alum. block is that correct aswell? Remember this is supposed to be my daily driver/sunday funday toy, not sunday funday toy and thats it, thats my main reason for wanting to stay with IFS

xxxtreme22r

Ok after further looking I am seeing 280-320hp depending on if it's JP or US/UK Spec and 323-338 ft-lb depending on if it's a VVTi engine or not.

I might have been looking at another spec for the GE engine and not the GTE. Either way it's running about the same as a VVTi 1uz (SC400) power wise.

Mandy Tuning

im on 200hp-292tq at the wheels on stock ifs with locker-33"tire and trail run very hard almost all the sundays available and never broke a part except 1 tie rod,but im auto trans,i know with a manual trans and my foot,cv life will be another story.

92Yoda

Do you do regular maintenence? Thats helps significantly in part life