BadAss SRT-Z - 2.4L / A568 - Update!!!

[Pat]

The one on the right is the a-typical stress-riser failure at the end of the splines. The other two...I wonder, is that where the seal rides where they snapped? If so, I'd almost be willing to bet that the seal wore a groove in them and caused a stress riser. If not, then my other thought would be possibly a bending force was applied to the shaft somehow causing overstress at peak torque. I forget, is there a support bushing on the driver's side like there is on the passenger side of the transmission? If not, then I wonder if there is wheel movement fore and aft during acceleration? (I know you mentioned you questioned how well the bushings are holding up after being beat on for something like 8 years).

I want to point out that I'm not a professional failure analysis engineer, so I might be off in my interpretation of what I'm seeing. I'm basing my opinions on what I learned while earning my degree and what I've read on those websites I posted up on the page before (I think is where they are). I'm open to any, and all other opinions and I do not consider myself to be a true *expert*. I just like looking at broken stuff and figuring out how and why it broke!

I am dropping the trans out to inspect and willl be going through the front end. I too suspect some sort of side loading/bending force that is snapping them. The two even broke in the same place....very odd.

Oh, and its not the seal surface. I will measure later, but the stub that was left in the trance was about 1.5" in from the seal IIRC.

---------- Post added at 10:26 PM ---------- Previous post was at 10:24 PM ----------

Damn, if I ever break one in the trans I want it to break like Pat's two! I've heard that they can be a real Beotch to get out when they break at the splines.

Although, Pat, when they broke further up the shaft like that, was there worse carnage from the axle breaking loose and flying around? (I'm assuming that's what happened)

One thing nice about them breaking at the spline...........no carnage, just spins and goes no where

---------- Post added at 06:12 PM ---------- Previous post was at 06:08 PM ----------



I don know.................JT slammed me pretty hard when I mentioned checking my axles after a race for this very purpose. Said that's why he pays the Big bucks, so he doesn't have to!

Wait a second, maybe that's all changed now................JT?

No other carnage thankfully. Everything stayed in place?

[bakes]

JT what are you cv shaft angles normally loaded and what you think they are like on launch???

[BadAssPerformance]

Damn, if I ever break one in the trans I want it to break like Pat's two! I've heard that they can be a real Beotch to get out when they break at the splines.

Breaking in the diff, I pull both axles and just push it out from the other side. The #1 pictured above that broke inside the intermediate shaft was a PITA I had to drill-tap-slide-hammer it out

One thing nice about them breaking at the spline...........no carnage, just spins and goes no where

very true!

I don know.................JT slammed me pretty hard when I mentioned checking my axles after a race for this very purpose. Said that's why he pays the Big bucks, so he doesn't have to!

Wait a second, maybe that's all changed now................JT?

Thin skin? Don't think it was close to a slam, more "to each his own" but yes, I would rather have CM axles than check every run.

I am dropping the trans out to inspect and willl be going through the front end. I too suspect some sort of side loading/bending force that is snapping them. The two even broke in the same place....very odd.

Oh, and its not the seal surface. I will measure later, but the stub that was left in the trance was about 1.5" in from the seal IIRC.

In from the seal is the slinger then the ID of the tailshaft extension housing?

JT what are you cv shaft angles normally loaded and what you think they are like on launch???

Was 5° at rest with the old stub strut LCAs, doubt the dual pivot LCA setup chanegd that. On launch I am sure it used to be worse than now, but IIR (need to find notes) at full rebound it was only ~10° under the ~14° limit

A couple 38lb boxes arrived today

[BadAssPerformance]

OK, cheap shot! Sorry bro, couldn't help myself..............

I know yer messin man, it's cool.. But I also will help you get DSS axles if you ever want them too LOL

[BadAssPerformance]

Don't think you can do that with a quaife. There is a solid center that divides the axles. Can't see through to the other side

Interesting... with the OBX just need a 10" long 3/8" drive extension thru the center washers

Opened the boxes up and all 4 inners have been replaced. I'll get some pics of the new axle ends before putting them in. Need to compare to pics of previous sets, they almost look like they took a pass and cleaned up the shaft from the splines up the shaft an inch or two.

---------- Post added at 10:02 PM ---------- Previous post was at 09:59 PM ----------

Cool, now do me a favour and weigh that long shaft so I can comparo to my equil length

I'll see what I can do, I dont have a good scale here tho and every time its near a shipping scale, its missing the end, LOL! Shipping weight for the pair in the box is just under 38lb

[black86glhs]

Don't think you can do that with a quaife. There is a solid center that divides the axles. Can't see through to the other side

Just drill a small hole through it silly!!!!

[Reaper1]

I'm not 100%, but I don't think the Quaife is *exactly* the same as the OBX internally. Plus I know I'd have a hard time drilling a hole in a $1200 diff that has a lifetime warranty as long as it's not modded!

[black86glhs]

I'm not 100%, but I don't think the Quaife is *exactly* the same as the OBX internally. Plus I know I'd have a hard time drilling a hole in a $1200 diff that has a lifetime warranty as long as it's not modded!

Just tell them it came that way. You guys need to stop sweating the details!

[Pat]

Nice, so even when they break that far along the shaft, they still stay/ spin in the seal?

Mine did, but the car was not rolling more than 1 mph when either popped. One happened at the line and the car barely moved, the other broke during the burnout just barely as the car started to pull forward.

JT- When I get a few minutes, I'll go out with the stubs and slide them into a trans and see exactly where they're breaking in relation to the diff/trans.

[Reaper1]

Pat, can you take pics when you do that and post them?

[Reeves]

I'm not 100%, but I don't think the Quaife is *exactly* the same as the OBX internally. Plus I know I'd have a hard time drilling a hole in a $1200 diff that has a lifetime warranty as long as it's not modded!

The OBX has one less "pinion" gear (for lack of a better term) than does the Quaife.

The Quaife is closed off in the middle.....no way to push an axle out from the other side.

[BadAssPerformance]

lol! I'm pretty sure Reaper ment after an entire race wknd, Not after every individual Race/Run! As did I.

Athough, you have been removing the entire trans after almost every race wknd lately anywho, so how hard is it to just stare at your splines? They're sitting right there!

How's that for thin skin..............Leatherback!!!!!

Oops, did it again............

LOL, yeah, the old trans was patched together with worn out used junk, living on "borrowed hopes and dreams", but the funny thing is almost every time I had it apart, it never came out of the car, nor did the axles! Awesome how these trans' can be serviced in vehicle Now the couple times the trans actually came out, yep I did take a look at them

[Reaper1]

Yeah, I meant after the event, not every race! LOL

[black86glhs]

lol, yeah, the old trans was patched together with worn out used junk, living on "borrowed hopes and dreams", but the funny thing is almost every time i had it apart, it never came out of the car, nor did the axles! Awesome how these trans' can be serviced in vehicle Now the couple times the trans actually came out, yep i did take a look at them

burn!!! Lol

[black86glhs]

Yeah, it was a stretch to call it a burn, but what can you do....LOL.

[moparman76_69]

Yeah, it was a stretch to call it a burn, but what can you do....LOL.

um.. not call it a burn?

[black86glhs]

um.. not call it a burn?

George, that would make too much sense.

[moparman76_69]

/threadjack

[BadAssPerformance]

Back on topic... won't have time to put the axles in till Saturday, will get pics.

[BadAssPerformance]

Need to get online here for more updates...

Went to track Sunday with the Chicagoland chapter outing.

Being a bracket event the track was set to hook pretty well.

1st pass, left hard but spun and bounced some, 10.600 @ 139.XX (post time slip data later)

2nd pass, dead hook - SNAP!

Before taking the axle out of the trans, I noticed there was some play between the center bar of the axle and the tripod joint... wondering if thats part of the problem?