How much torque on stock alum drive shaft

**CAMSS2002** · 04-21-2010, 06:31 AM

Im wondering if I need to replace the stock aluminum drive shaft. I am pulling about 550 ft lbs of torque and may pull about 575 after i boost a little bit more. Anyone know how much torque the stock can take???

**Cutlass** · 04-21-2010, 05:40 PM

Its probablly time to replace it.

**Cutlass** · 04-21-2010, 05:42 PM

http://www.ls1.com/forums/showthread.php?t=123505

**CAMSS2002** · 04-21-2010, 08:14 PM

well that answered my question!!! looks just like mine... well i even have my mind set on the pst... thanks!

**Y2KPewterSS** · 04-21-2010, 09:52 PM

Definitely time to upgrade

**Hi-Po** · 04-21-2010, 10:00 PM

PST is a good piece, you wont be disappointed.

**Supershafts** · 04-24-2010, 01:41 PM

The factory shaft should handle 575, if it is going to break from power it will break at the line...

**INMY01TA** · 04-24-2010, 05:06 PM

Originally Posted by Supershafts

The factory shaft should handle 575

Yeah right. I've seen bolt on cars twist them in two. There's a pic of mine broken in that thread linked above, I definaetely don't make 575.

**Supershafts** · 04-24-2010, 08:11 PM

Originally Posted by INMY01TA

Yeah right. I've seen bolt on cars twist them in two. There's a pic of mine broken in that thread linked above, I definaetely don't make 575.

Yeah and exactly how did it break......

You just hit the gas and it broke.... i doubt it...

Maybe you had severe traction issues and wheel hop...or some other issues..

There are many reasons shafts break, what exactly happened when it broke...what exactly did you do.... then you'll know the problem...

Im not saying there unbreakable....but if you're saying you have less then 500ft lbs and you broke it.... im telling you it's something else causing it, not the shaft....

.

**INMY01TA** · 04-25-2010, 05:10 AM

Originally Posted by Supershafts

Yeah and exactly how did it break......

You just hit the gas and it broke.... i doubt it...

Maybe you had severe traction issues and wheel hop...or some other issues..

There are many reasons shafts break, what exactly happened when it broke...what exactly did you do.... then you'll know the problem...

Im not saying there unbreakable....but if you're saying you have less then 500ft lbs and you broke it.... im telling you it's something else causing it, not the shaft....

.

It's called drag racing with an M6 and sticky tires.

**Supershafts** · 04-25-2010, 07:00 AM

Originally Posted by INMY01TA

It's called drag racing with an M6 and sticky tires.

Then there is very well a issue to what i said... depending what happens when you let the clutch out, and what rpm you are doing it, there is a very very good chance the issue is from loading and unloading...

How far out does it break ?

The very second the clutch touches the flywheel ?....or a few feet? or 60 ft? or more?

**INMY01TA** · 04-25-2010, 07:03 AM

Well I launch my car at around 6,500. Mine broke right off the line, so did a friends. Read about others who've broke further out but there's was prolly already wounded. I believe it'll work for a while with an A4 but for 6 speed on stickies I'd swap it.

**Supershafts** · 04-25-2010, 07:26 AM

6500 ! seems excessive? pk tq is at 6500?

I am gonna stick with loading issues why there breaking... The 3.5" shaft is able to cope with the loading issues a little more, but i'd be careful and fix that issue..

**INMY01TA** · 04-25-2010, 07:36 AM

If you wanna run good times you gotta beat the shit outta your car. I know lots of fast six speed guys (10.90s-11.30s cam only) and all launch 6,000+. I launch as high as the tires will stick, this changes due to track prep, temperature etc. Are you gonna tell me stock 10 bolt breakages are due to "loading issues" as well?

**Supershafts** · 04-25-2010, 06:18 PM

If you want i can show you broken 9", dana 60's 70's, 14 bolts 10" and 11" versions and even a dana 80....from drivers just doing things that aren't necessary or that didn't know when to take there foot off the gas pedal...
I tell them the truth, it didn't break cause you just hit the gas...

I can break any rear you want if i have the suspension set up wrong or get tire shake...leave higher then i need to, loading and unloading anything in the driveline is killer....

Loading the driveline and how it is loaded is why certain things break....

You'll learn that sticks take a unloaded driveline and suddenly shock it, then the surge of the shock is overcome (unloaded) and then it settles in and is loaded again...
So when you hit the driveline like that, you take a at rest driveline (with slack or play in it and are hitting it with a hammer) and that sends the pinion wanting to crash thru the front and shove the carrier out the cover...
The bearings aren't that large for the pressure and the caps and housing aren't that strong either in the 7.5 10 bolt...depending on the power being hammered on them... so if you have a m6 and leave at 6000 and the hp/tq is what at 6000 then you have ___ hp hitting the ring at slack. The design of the 7.5 vs other 7" rears is funny how others can deal with more power..

You'll see that you can get things in a stick car to live longer if you use the LL and just load the driveline ever so slightly with the clutch.... try leaving at pk tq.... i would leave just past pk tq and see if you go faster...