Author Topic: Strength of a Toy 8" rear (Read 3280 times)

S-10 Stewy · « **on:** Jan 15, 2006, 10:19:50 PM »

OK guys, I don't see many posts about this and it has been on my mind lately. I know most of us would call our rear Toy axles "stellar" or "frickin tuff"

but I want to get some feed back from those who have one. I am guessing that because very few are ever broke, we just don't talk much about em but here is what I am wanting to hear about:

If you have broken a rear, what failed? Anybody ever twisted a rear shaft? Anybody ever broke a rear 4340 axle shaft?

and lastly, has anybody ever broke a rear driveline from just plain old torque / excessive power / abuse?

I welcome your comments. :-)

IronClad · « **Reply #1 on:** Jan 15, 2006, 10:33:18 PM »

went through about 4 4.10 rearends( 3 welded 1 open) and 2 4.37 rearends (both welded) peeled a rear housing.. twisted splines on 2 shafts.. LOTTSS of broken ujoints and 2 yokes. never sheered any driveline bolts though.. the housings leave alot to be desired ( they like to peel at the perch which then peels the rest of the housing.. gets ugly) pretty much the only thing that they have going for them is the axle shafts are a hair stouter than a FF dana60 30spline shaft and good ground clearence..

Carter62 · « **Reply #2 on:** Jan 15, 2006, 10:50:05 PM »

I've been driving mine for seven years with detroit as a dd and the only failure I had was a pinion bearing on the frwy

makes some bad noise. Other than that I'm suprised I haven't when that thing pops and BANGS on the road engaging

, gotta have the air pressure equal. Overall, I'm greatly satisfied but I just run 33s and dual stock cases.

DTB · « **Reply #3 on:** Jan 15, 2006, 10:56:58 PM »

so far I've only put a huge dent in the back of the pumpkin.

guess i'm not wheelin hard enough.

furrballs95 · « **Reply #4 on:** Jan 15, 2006, 11:09:13 PM »

my one buddy has a 99 4runner he went threw 2 ring gears. ive destroyed a ifs front center section cracked every tooth on the ring gear and sheared off about 10 of them,thats why i am SAS my truck with a v6 third member. but all in all i think that the 8" rears are pretty strong, alot of it has to do with the way you put it together if you have takin it apart. you will destoy any rearend if its not together right.

S-10 Stewy · « **Reply #5 on:** Jan 16, 2006, 09:11:17 AM »

Dang Ironclad ......I am guessing a very heavy right foot at just the right time is leading to some heavy destruction. You did not say what the time frame was that you had all those part fail .... 1yr, 2yr ....

?

Also, what size tires, gears, engine and are you doubled up on the cases?

IronClad · « **Reply #6 on:** Jan 16, 2006, 09:54:48 AM »

through about 2 and a half years.. stock case mostly modified motors (LC engineering efi performer 4cyl) lots of heavy foot assaults with tires ranging from 31 to 37. my first time through the rubicon i was on 4.10 gears and 37" tires welded in the back and made it through with only tearing a shock off. Im not to big on yota stuff as my halfton chevy crap that i got for 50 bucks ( 10bolt front 12bolt rear) has served me alot better than the yota stuff has.

i know how to drive but my drive style is alot more throttle related.. its that go fast in me ( im the retard you see up in the hills blasting by you at 50mph in the snow )

79coyotefrg · « **Reply #7 on:** Jan 16, 2006, 09:54:53 AM »

im guessing since Marlin runs like a 3.93tranny+4.7+4.7+4.7+5.29 and 35-37"tires that should explain alot

seanc · « **Reply #8 on:** Jan 16, 2006, 09:57:06 AM »

only gone through one driveline and i use ALOT of throttle, to make up for lack of skill of course.

S-10 Stewy · « **Reply #9 on:** Jan 17, 2006, 08:01:02 PM »

Good feed back! I want more .... c'mon everybody, I want to hear (and so does everybody else) the low down on broken rear axles. I know there are more stories out their.

Nice picture there seanc. Beautiful I must say!

IronClad · « **Reply #10 on:** Jan 17, 2006, 08:03:53 PM »

heres the only pic i have of my broken housing

BLACKDOG · « **Reply #11 on:** Jan 17, 2006, 10:40:02 PM »

Jeez dude, how'd you do that??

Nothing bad about mine, I did blow a ring gear with a detroit, but those gears had been in there for about 3 years, and when I looked at them after they were pulled, I noticed they had worn kinda funny. I don't think they were set up right. Also, I've sheared off 2 driveline bolts, at different times, but I really don't consider that a problem. I'd rather have those go than say, a ring gear, or a locker

Other than that, I've never had any troubles. I've seen my axle tube dropped from about a foot up onto a rock, hitting it almost dead center between the diff and the pass. wheel. Put a small dent in the housing and scratched the paint. Also let me know never to let my dad drive my rig on the 'con

IronClad · « **Reply #12 on:** Jan 17, 2006, 10:41:38 PM »

wheelin is how i did it

BLACKDOG · « **Reply #13 on:** Jan 17, 2006, 10:51:05 PM »

Quote from: IronClad on Jan 17, 2006, 10:41:38 PM

wheelin is how i did it

Really!!! WOW!!! I figured it was from doign a little mall crawlin'

6.72:1 · « **Reply #14 on:** Jan 17, 2006, 11:00:03 PM »

Hey now, I have done some serious mall crawlin' I am quite an authority on the matter.

BLACKDOG · « **Reply #15 on:** Jan 17, 2006, 11:03:42 PM »

Quote from: BIGTONKA on Jan 17, 2006, 11:00:03 PM

Hey now, I have done some serious mall crawlin' I am quite an authority on the matter.

I see, so how many axle tubes have you broken

6.72:1 · « **Reply #16 on:** Jan 17, 2006, 11:05:47 PM »

Well, I try. Sometimes, the terrain gets a little gnarly, but time will tell.

88runner · « **Reply #17 on:** Jan 18, 2006, 10:31:15 AM »

Quote from: IronClad on Jan 17, 2006, 08:03:53 PM

heres the only pic i have of my broken housing

we need more info on this one, what year is the housing, is this the factory spring perch or did you weld them on.
I don't remember who told that the newer style housing (95+ I think, the longer ones) is weaker then the older ones.

from y experience, the rear axle has no strength issue, I once pulled a friend out of a real heavy mud hole about 4' deep,
I was bouncing all around, it took me about 8 time before I got him out with the pedal to the floor, that was on my
88 pickup v6, that rear axle is now on my runner and is in good shape.

v6 third member have more ribs on their side which resolve the issue of the third flexing and allowing some binding and
this is how most breakage happen.

IronClad · « **Reply #18 on:** Jan 18, 2006, 10:42:50 AM »

was an 85 housing which is the stronger style. factory spring perch the only thing that was not stock in/on that axle was the shock mounts and the dodge leaf springs.

the rear axle does have alot of strength issues.. mostly with the housing. they LOVVEEEE to peel and squish and bend.. ive seen it all and ive seen it alot. ive had less problems with my half ton chevy junk than i did with toyota axles..

and gearsets dont fail because of housing flex. they fail because the ring gear deflects ( has nothing to do with extra ribs on the housing) and they murder themselves. trucks with v6 thirds eat themselves just as often as 4cyl housings.

88runner · « **Reply #19 on:** Jan 18, 2006, 11:00:18 AM »

Quote from: IronClad on Jan 18, 2006, 10:42:50 AM

and gearsets dont fail because of housing flex. they fail because the ring gear deflects ( has nothing to do with extra ribs on the housing) and they murder themselves. trucks with v6 thirds eat themselves just as often as 4cyl housings.

uh! and the ring gear deflect because of what

It has been proven that the extra ribs on the side of the third member is a major improvment strength wise. the ring gear deflect
because of the third member deflecting. I didn't say the housing was flexing.
beleive me or not I've never seen a rear axle tube nrak like yours, and if you ask me, I think it's due to other thing then strength issue.

IronClad · « **Reply #20 on:** Jan 18, 2006, 11:07:48 AM »

i ment the third houseing.. should have been easy to pick up since i mentioned the ribs.. but anyway. the ring gear deflects because the pinion is trying to walk on it and pushes the ring gear away which = boom

on the housing.. go look at one and just look at the weld that holds the 2 halfs together . thats where they start to peel and crack and then it travels up around the spring perch weld.. its not a good design.. and on the later model housings they smash around the perches. this is extremely normal.. if you go look in lilbuddy's thread you will notice his axle housing did the same thing and i know he isnt as hard on his rig as i am on mine.

S-10 Stewy · « **Reply #21 on:** Jan 18, 2006, 02:34:21 PM »

Wow guys ... awesome sparing going on here!

I love the feed back.. I have my own views on this issue ... but I want to hear some more from others.

S-10 Stewy

kneedownnate · « **Reply #22 on:** Jan 18, 2006, 04:43:36 PM »

I've been through 2 sets of 4.37s and am currently close to changing out my 4.30s, all on 31s peg-leggin it.

whiteman · « **Reply #23 on:** Jan 18, 2006, 05:44:44 PM »

The Toyota 8" is a tough little monster, I have seen them hold up to some harsh abuse. Although if you are running a V8 and large tire or vise versa, you could break them if you really wanted to. Buddy of mine has a locker and the all pro axle shaft, with 37" Toyo's, and a built 3.0L and does dry pavment donuts all the time. He did however break a 5.29 ring though

.

6.72:1 · « **Reply #24 on:** Jan 18, 2006, 11:04:52 PM »

I have done some dry pavement burnouts when I was first goofing off in my truck after we built it. Third was set-up very well and everything else seemed to hold up. Of course, the 22R doesn't have that much power either, but a 40 inch tire is a 40 inch tire. No obliterated axle housings though.

S-10 Stewy [OP]

S-10 Stewy [OP]

S-10 Stewy [OP]

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