jimep

no, just saying the 4 cyl and 6 cyl 3rd members are different but interchangeable. the axle housing's aren't interchangeable from *89 and older to 90 and newer. I stand corrected on that year typo... Can't bolt coil springs and control arms up to leaf spring perches.

Junkers88

Oh got it! I was thinking that my parts field had just been limited. *sigh* Parts are so hard to find that I was worried.

Oh and just for fun. Coils (have to look close) on a leaf sprung housing.


Front end to show I didn't pick half the tires...... don't laugh at the "flex".

75k5toy

Don't forget to check the axleshaft bearings.

kornhuskerwizard

so how do you identify what gear ratio you have on the ring & pinion? Just wondering cause im wanting to swap rearends from a 86 to my 88 4x4 truck.

Tofer

holy crap this thread has some BAD info in it.........


to set the record straight:

* YES 79-95 8" 3rd members from either truck/4runner will go into any 8" housing... FRONT or REAR

* V6 housing use bigger bearings and 4 spider gears in the carrier which make them stronger than 4cyl which has the smaller bearings and 2 spider gears. _HOWEVER_ you can use 4cyl housing with a V6 without *many* issues. I've been running a 4cyl with a lockright in the rear of my 89. (while i am having lockright issues, the housing and gears are soild). my brother has been running 456 4cly open in the rear of his pickup for years. If you do a 350 swap, you'll most likely want the v6 housing.... otherwise the power (or lack of power) the 22re/3vze create aren't an issue. you can itenify the difference between the V6 and 4cyl housing based on the number of "ribs" they have.... V6 have 4, 4cyl have 3 as see here:


* 79-85 rear ends are narrower than 86-95. so while the 3rd member is inter changeable the axle shafts are not. the Drum are also smaller on pre 86 axles.

*79-95 Pickups and 84-89 4runners are leaf sprung (unless otherwise molested) 90-95 4runners are coil sprung (agian, unless otherwise molested)

* there are several "oem" gear ratios available.. make sure you get the correct one to match your existing ratio when pulling one from the J-yard... otherwise you'll be back here asking which transfercase you need to pull from said J-yard.

* you can tell the gear ratio by several methods: Color code, VIN code, or simply counting teeth.

* Color code method: toyota painted the Pinion end from the factory:
410: Pink
430: Blue
456: Yellow
4:88: White

VIN code:
410: G292/G294
430: G282/G284
456: G254
488: G144

Counting the Teeth Method
410: 41(r)/10(p)
430: 43(r)/10(p)
456: 41(r)/9(p)
488: 39(r)/8(p)

* IF you use *Factory* 4.88 gears, you are _UNABLE_ to regear them later. factory 4.88s use a offset pinion, that only work with that ring/pinion set.

* IF your pinion nut loosened up, you _CANNOT_ just tighten it back up... you have NO way of knowing the pinion depth/backlashing on the gears and will most likey blow them up shortly there after.

jimep

good post. kinda along the lines of what I was trying to say. (except for getting wrong years in for the coil sprung 4runners). Aso 2 small thing u forgot to mention. 85 and older have smaller rear drums... V6 (4wd) thirdmembers identifiable by 4 ribbed flanges running horizontaly, 4 cyl(4wd) only had 3... Now I think we covered EVERYTHING

Tofer

edited to include your suggestions.

awareness

Sometime ago I was wondering how much trouble it would be to swap in a T100 or Tundra rear into a 86-95 Pickup for the sake of getting closer to the track width of a Total Chaos LT front setup (this would make the rear around 3" wider than the TC setup in the front?).

Anyways, gears aside, how easy or hard might this be to do?

jimep

just looked at my 00 2wd tundra and it looks close. 6 lug. same style ebrake it looks like although it comes down from the drivers side of the frame. u might have to relocate spring perches though, shock brackets will deffinatly need relocated.

MudHippy

Excellent post. Except for this part. Which is wrong.

The torque load on the pinion nut doesn't affect the pinion depth or the backlash(ring gear or side gear).

Pinion depth is set by the shim directly behind the head of the pinion gear. Pinion depth isn't changeable except through replacing that shim, and/or by wear that might occur to the inner and/or outer pinion bearings.

Ring gear backlash is set by either shimming the carrier bearings(7.5" differentials), or by turning the carrier bearing preload/ring gear backlash adjustment nuts(8" differentials).

Side gear backlash is set by shimming the side gears.

The pinion nut only controls drive pinion preload. Though that can technically be called a type of "backlash" measurement, that's highly misleading to those who aren't familiar with what it actually measures. Which actually isn't "backlash" at all, but is instead the combined preload of the pinion bearings and carrier bearings. The measured backlash between the drive pinion and ring gear, or simply the ring gear backlash as it's commonly refered to, has nothing to do with it in reality. So to call it the "preload of the backlash between the drive pinion and ring gear" is nearly non-sensical. Why Toyota chose to use those terms is beyond me. I'm just glad I know better.
http://personal.utulsa.edu/~nathan-b...35differen.pdf

I'm not trying to pick on you. I just came acrossed your post linked to in a "newbie information" section, and it wouldn't be fair to lead the "newbs" down the wrong path. As you most certainly _CAN_ retighten the pinion nut without fear of gear failure, if you know what the torque setting and preload measurement should be when you do. And provided that the pinion bearings, inner and outer, haven't worn significantly enough to cause the pinion depth to change dramatically. Which isn't too likely unless they've been run without the proper preload for quite some time. Meaning, you can almost always just retighten the pinion nut and be fine. People do it all the time.

day1977

can i put a 84-85 4.10 3rd member on my 91 rear axle?

iliketoyota

yes all pre 96 8 inch 3rd members are interchangeable