Rear axle questions... (1 Viewer)

[YellowJacket]

I did do a search...

I found one of my questions on slee's site. Looks like the factory e-locker started in 93...

(((I HAVE A REAR ELECTRIC LOCKING DIFFERENTIAL FROM A 93-97 LC)))

Also, I keep getting different answers on this question. I just got an e-locked rear diff and am trying to get a solid answer on the ring gear diameter w/o taking it apart. Is it an 8" or is it a 9.5" or what?

I got this for my 87 Runner since I just broke my current ring and pinion in Moab a few weeks back. I just heard that there is no way my stock axle housing can be modified to accept this diff. (I though it was the same as the OEM e-locker found in the 4Runners.)

I am wondering if I should still try to use this diff (since I just got 4.88 yukons ordered for it) and look for a complete rear axle minus the diff of course. I was hoping for something stronger than the common 8" ring and pinion since I am running more power than normal.

Does anyone have a pic that I can check out to see what mods would have to be done to use the rear housing? I know I would have to do brake mods (drum-disc) cut off the coil spring suspension items and weld on spring perches. what else. I should probably get both axle pic side by side...

Would I have to use the cruiser shafts. I assume they are different? More splines? Wider? Larger diameter? Etc....

 

[Cruiserdrew]

I have seen mini guys swap in the high pinion FRONT 80 series diff, but the rear is way too big for a mini-truck axle.

The locker mechanism is the same design but the 80 series rear diff is 100% incompatable with a mini-truck 8 inch differential housing, no matter how medieval you get with an angle grinder. If for sure it's a rear, then you are out of luck.

 

[YellowJacket]

I figured that may be the case if the front high pinion's were still an 8" and the rear's were a 9.5"

 

[YellowJacket]

No one has any other comments or anything? I am kind of desperate. I have my gears at Bobby Long in WA waiting for a heat treatment on my word.

What about the ring gear sizes etc??

 

[KLF]

So, is this a REAR e-locker out of an 80-series? Just want to be sure, but assuming that, no it won't fit in your existing axle housing, no way no how.

I don't think it's worth trying to retrofit the 80-series rear axle to your 4Runner, although it's been done. It's a lot wider, and besides the different spring mounts, it is also slightly off-center on the diff, so the driveshaft will be at an odd angle. You're better off getting a TRD Tacoma rear e-locker, much easier to just mod your existing housing to fit that. It's been documented MANY times on the 'net, do some Googling.

 

[YellowJacket]

OH CRAP!!

I forgot, I have heard that!!!

CRAP!!!!!!!!!!!

This is a rear from a 93-97 LC.

If it is a 9.5" I need to make it work if possible. I will be running over 400 rwhp soon and I think it would suck even more to go D60.

KLF...You say it's been done. I need names.....


P.S. Thanks for the response!

 

[cc93cruiser]

The rear ring gear diameter for an 80 series 93-97 is indeed a 9.5".. The front is a hi-pinion reverse cut 8" ring gear..

 

[YellowJacket]

Thank you. Some good solid facts.

BTW I will try some googling.

 

[tntoyota]

I just got an e-locked rear diff

From a what?



FWIW and probably wrong:

1: for what its worth in your case I would go to a Toyota dealership and compare the rear end diff gaskets.



2: probably wrong but........ I am assuming you have a L.C *rear* locking diff, TRY, and I do mean try to see if that rear will fit a (2MK) a fj60-62 rear not positive but I think because they have a non offset rear housing.

IF, and I do mean IF the bolt holes are the same, I just had a hit&run on my 94 4r in my drive way, I painted the wheel loacations (of the 4r) and parking my 91 fj80 in the same loacation, the width and wheel base wher almost identical. I dont think the 60's width would be all that radical of difference.


I think, *IF* you have a L.C *rear* difflock and *IF* the holes match you might consider puting a L.C rear under your 4r rear, all this is off the top of my head so I am probobably (very) wrong but I'm trying to stimulate you into thinking of a soulution as well.



2MK, fj80 fronts are reverse rotation 8" and have the same bolt pattern as the (79-95)mini. (would not recomend in the rear of a DD)
2MK, fj80 rears are the larger 9.? R&P.
2MK, "TRD" rears, NOT limited to 4r's, are 8" but have a different bolt pattern to the 79-95 housing.


Please be specific so we know What your talking about and can help you better in the future.


I am probably (very) wrong but I'm trying to stimulate you into thinking of a soulution as well.

 

[tntoyota]

I did do a search...
1st
I was hoping for something stronger than the common 8" ring and pinion since I am running more power than normal.

2nd
Does anyone have a pic that I can check out to see what mods would have to be done to use the rear housing? I know I would have to do brake mods (drum-disc) cut off the coil spring suspension items and weld on spring perches. what else....

Ok 1st the rr 8" is stronger than a std regular rotation because it enguages the gears on the con cave side as opposed to the normal rotation's enguaging on the Ex cave side I might right that as visa-versa but that is why its stronger and most people do NOT recomend this in a rear drive app.


2nd this is impossable you have an offset case in the fj80 rear and a non offset rear in the 4r.

 

[Arya Ebrahimi]

tntoyota, there's a lot of confusing, not so accurate info in your post.

YellowJacket, the rear diff from a '93-97 is indeed a 9.5" ring gear. These diffs are NOT compatible with a mini-truck axle. The front diff from a '93-97 is a HP 8" diff and IS compatible with mini-truck axles(but is not recommended for use in the rear).

Tacomas use the "8.4" diff except for the TRD factory E-locked trucks, which came with the 8" diff. ALL 4 runners came with the 8" diff, no 8.4's. All pre tacoma mini-trucks also use the 8" diff, no 8.4s. T100s and Tundras all use the 8.4"

For mini-trucks:
79-85 rear axles are 55" wide, 86-95 are 58" wide, and 95.5(Taco's)-'04 are 60" wide.

'93-97 Land Cruiser rear axles are 63" wide, but have the offset diff as previously mentioned.

All of this info is available in the FAQ thread in the mini-truck section of PBB minus the info on Land Cruiser diffs.

Basically, if you have a Land Cruiser diff, you are SOL in my opinion. Sell it and buy a Tacoma e-locker to fit in your current housing.

Ary

 

[YellowJacket]

Thank you tntoyota!

Yes, I HAVE A REAR ELECTRIC LOCKING DIFFERENTIAL FROM A 93-97 LC

Right know I am trying to figure out if it's still at all possible to use this diff. I need a strong (but affordable) locker, and I need a strong ring and pinion. I was not thinking properly when I recently acquired this diff but now I have it and $450 in gears and master install kit.

 

[Arya Ebrahimi]

Read my post above yours

 

[YellowJacket]

Thank you Ary! Very good info.

I was still hoping (like KLF stated) that there was a way to run an offset axle. Guess there is probably not.

Did find some more good info though.

AXLE CODES
Example: K 08 2
^ ^^ ^-2 pinions!?
| ++---4.11 ring/pinion ratio
+------9.25" ring gear


First Digit Ring Gear Size
G 8"
J 9.25"
K 9.5"



2nd, 3rd digits Ring /Pinion Gear Ratio
1 3.3 --
2 3.36 --
3 3.545 --
4 3.556 --
5 3.7 HD
6 3.889 --
7 3.9 HD
8 4.111 HD
9 4.222 --
10 4.375 --
11 4.444 --
12 4.625 --
13 4.79 --
14 4.875 LD
15 5.125 --
16 5.286 --
17 5.6 --
18 5.714 --
19 5.833 --
20 6.167 --
21 6.667 --
22 6.78 --
23 6.833 --
24 7.64 --
25 4.556 --
26 5.571 --
27 3.364 --
28 4.3 --
29 4.1 --
30 3.727 --
31 3.909 --
32 6.591or 5.583 --
33 7.503 or 5.583 --
34 6.781or 4.786 --
35 7.636 or 5.6 --
36 4.778 --
37 3.583 --
38 3.417 --



4th digit Number of Pinoions Limited Slip
2 2 Open
3 2 Limited Slip
4 4 Locking
5 4 Limited Slip

 

[Cruiserdrew]

Yellow-It isn't going to fit. No way, no how. You got misdirected down the wrong path. A 9.5 inch differential is not going to fit in an 8 inch axle housing. Get over it now before you throw away more time and money.

ALL land cruisers are off-set in the rear except for a rare few FJ40s from the late 1950s. Technically you could swap in a complete rear 80 series axle, but it would be huge amounts of work and when done, will still be off-set and too wide. Same for the FJ60 housing mentioned above.

Here is a radical idea. Sell your Land Cruiser diff, it won't help you otherwise. Buy a mini-truck 3rd member and the gears of you choice. Add an ARB and you are good to go. You are trying to make something easy, difficult.

Edit: If you want to put big power through it, you need to seriously upgrade your hardware, like a built 35 spline Dana 60. I would stop looking at Toyota stuff now. There isn't a cheap way to do what you want, sorry.

 

[YellowJacket]

More "CRAPPY" good information.

Regular Land Cruiser axle housings are similar to a Ford 9" and differential carriers are similar in construction to a Chevy 12bolt. The front and rear differential housings are both offset to the right in all models except some '58-62's which were centred. They have an 9.25" ring gear. The axle shafts are 33mm in diameter (the same as a some Dana 60's)

 

[YellowJacket]

Yellow-It isn't going to fit. No way, no how. You got misdirected down the wrong path. A 9.5 inch differential is not going to fit in an 8 inch axle housing. Get over it now before you throw away more time and money.

ALL land cruisers are off-set in the rear except for a rare few FJ40s from the late 1950s. Technically you could swap in a complete rear 80 series axle, but it would be huge amounts of work and when done, will still be off-set and too wide. Same for the FJ60 housing mentioned above.

Here is a radical idea. Sell your Land Cruiser diff, it won't help you otherwise. Buy a mini-truck 3rd member and the gears of you choice. Add an ARB and you are good to go. You are trying to make something easy, difficult.

I understand that a 9.5" won't fit in an 8". I was wondering if there is anyway to run a complete LC rear. But it sounds like not. I am not worried about width. I am thinking about going D60 if I can't make this work. I have tons of crappy mini truck diffs.

If I can't do this diff/axle I may try for a D60. Other than that I will have this diff for sale and be looking for a 4Runner e-locker.

 

[YellowJacket]

But doing a D60 brings up other stupid stuff like lug patterns. No more tire rotations. I should carry two spares. I guess this is why people do front and rear...

 

[KLF]

I'm with Drew, don't even go down the Cruiser e-locker road, make a U-turn right now, start over. You should also be aware that there have been some failures in the rear axles with this locker in FZJ80s, and it was UGLY to fix it. Like, "torching holes in the axle housing to retrieve busted axle shaft bits" ugly. I personally don't like this locker, it's a PITA to re-gear too. Stupid shims for setting backlash... who's bright idea was THAT?

If you REALLY want to install the 80-series axle in the back, I do know of one guy, his handle here is "bjowett", he did it a few years ago. He sometimes posts in the Hard Core section. Nice guy too, I bought a junk turbo truck from him a few months ago.

If you're really gonna be running that much HP, I'd go D60 now. I'm wondering WHY you have to have that much power, but that's a different thread.

What about getting a Tundra rear axle, install an ARB? Just an idea, probably won't help.

tntoyota, if you think you're wrong about something, then you ARE. Geez you sure posted a lot of wrong info up there. You seriously need to get a "Clue" button for your keyboard, dude.

 

[YellowJacket]

What about getting a Tundra rear axle, install an ARB? Just an idea, probably won't help.

That is an idea. I need to find out what the ring gear size is. I heard that it's only still an 8" though. I will search...