Aisin Hubs Education

[Getsum]

OK, here's the deal...and yes I've searched.

In 4x4 only one rear tire is spinning...the other is basically just sitting there. I have read that I need to be able to lock out both the front and rear hubs to actually get true 4x4 because the 2nd gen trucks have lsd which allows one tire to just sit there while the other spins.

My question is this, will Aisin hubs lock out the diff or just simply engage the 4x4 manually (I have a pair coming in soon)?

To install a locker do I need to tear down the pumkins?

Not sure I completely understand the 4x4 system on this truck yet. It seems stupid to have it in 4x4 and have a tire in front and back spinning...seems more like a 2wd, just one tire turning up front and one in back.

My landcruiser I had in Japan (FJ80) had switches that could lock out the center diff as well as the front and back diffs...sigh...a real truck.....

 

[fourwd1]

I think you're mixing locking hubs with a locking differential.

The hubs disengage the wheels from the axle shafts to reduce drag and wear in 2WD.
Lockers in the diff connect the L + R axle shafts together so both wheels are driven.

Most stock diffs are open - all power goes to the wheel with no traction
Some have a Limited Slip Diff - which sends some of the power to the wheel with traction
Then you get to some (like Toyota and Jeep) that have a locked diff - equal power is sent to both wheels. Stock lockers are usually selectable, either air or electrically controlled, ie they are open or locked.

You can add a locker or LSD to an open diff, but it does require removing the diff.
There are many types of aftermarket lockers to choose from, the selectable being the most expensive.

 

[Getsum]

I think you're mixing locking hubs with a locking differential.

The hubs disengage the wheels from the axle shafts to reduce drag and wear in 2WD.
Lockers in the diff connect the L + R axle shafts together so both wheels are driven.

Most stock diffs are open - all power goes to the wheel with no traction
Some have a Limited Slip Diff - which sends some of the power to the wheel with traction
Then you get to some (like Toyota and Jeep) that have a locked diff - equal power is sent to both wheels. Stock lockers are usually selectable, either air or electrically controlled, ie they are open or locked.

You can add a locker or LSD to an open diff, but it does require removing the diff.
There are many types of aftermarket lockers to choose from, the selectable being the most expensive.

Thank you...that cleared up a few misconceptions I had and you did it without making me feel like a idiot...well done.

Open diffs...in a 4WD...that just makes a ton of sense.:redbrick: When, if ever, would anyone want all the power going to a tire that is spinning? From what I read, this is what the 2nd gens have for axles...correct? If so, that makes this truck basically have one drive tire in the front and back when in 4X4...the other two are basically there for the free ride and to balance the vehicle...nice design.

Dare I ask what the cost is to buy/install a capable (read cheapest) locker? Does the diff have to be torn down? (which requires the tools and experience necessary to guarantee proper gear lash).

Seems like we are spending a lot of money to get a truck that the LC already is???

 

[fourwd1]

Thanks.

Both the Aussie and Ox lockers are inexpensive locker that have good reps.
At the other end of the spectrum are the selectable type like the ARB and Toyota e-locker. They go from open to fully locked at a flip of the switch.

All require disassembly of the axle in order to remove the diff.
Some are easier to install into the diff than others.

 

[Getsum]

Thanks.

Both the Aussie and Ox lockers are inexpensive locker that have good reps.
At the other end of the spectrum are the selectable type like the ARB and Toyota e-locker. They go from open to fully locked at a flip of the switch.

All require disassembly of the axle in order to remove the diff.
Some are easier to install into the diff than others.

Was I right about the 2nd gens having open diffs? I think I remember reading this. Thanks for the info!

 

[fourwd1]

I can't remember when Toyota came out with the e-locker option, but i think it was in the 3rd gen time period. So yes you're open. To double check, does your rear look like the one on the right? That's the factory e-locked diff.

 

[fishrod]

From what I read, this is what the 2nd gens have for axles...correct? If so, that makes this truck basically have one drive tire in the front and back when in 4X4...the other two are basically there for the free ride and to balance the vehicle...nice design.

I have a 2nd gen with (im pretty sure) stock setup. Do I have locked or unlocked diffs?

When I head up the snow I put it in 4HI and drive around on the roads up there sometimes in 6 inches of snow. Ive never had a case where I felt I was getting stuck or a single wheel was slipping, Im sure ive had all 4 wheels gripping and spinning as one as I go up some steep driveways.

If only 1 front and 1 rear wheel were spinning (ie "all power goes to the wheel with no traction") then wouldnt I not get anywhere when things start to slip and slide? I doubt I would get out of some of the driveways I have to go in and out of if I wasnt getting power to all 4 wheels......

But maybe im wrong...

 

[fourwd1]

If you have a stock/factory locker it will look like the one on the right, above.

 

[Holdman]

Quick question, i have an 88 sr5 with the AISIN manual lock hubs. was having issues with the 4wd in it, and it appears the axle is like a quarter to half inch outside the teeth in the hub. what can cause this and how can i fix this? its on the drivers side, btw, passenger side no issues