[405bhp]

i was at the track 2 days ago and launched the car hard at 5000 rpm all of a sudden the car got locked, both wheels at the back were locked and they had to toe the car out. I was really dissapointed and shocked. I had my MT ET street tires on the car that day and did alot of burnout and tires were too sticky plus the track was sticky too! this caused the shaft to brake.

i'd like to upgrade my shaft now, anyone recommend anything? and will upgrade anything to avid these kind of stuff happening again, please let me know what you recommend in this case.

thanks guys
Ebrahim

 

[MikesZ06]

i was at the track 2 days ago and launched the car hard at 5000 rpm all of a sudden the car got locked, both wheels at the back were locked and they had to toe the car out. I was really dissapointed and shocked. I had my MT ET street tires on the car that day and did alot of burnout and tires were too sticky plus the track was sticky too! this caused the shaft to brake.

i'd like to upgrade my shaft now, anyone recommend anything? and will upgrade anything to avid these kind of stuff happening again, please let me know what you recommend in this case.

thanks guys
Ebrahim

Ebrahim, any time you launch hard on an IRS rear end, you run the risk of breaking a half shaft or even the main shaft. Although it is impossible to 'bulletproof' your drivetrain for drag racing conditions, the three main things you can do to try and decrease the potential are the following...

Hardened half shaft
Hardened main shaft
Diff/tranny brace

Although several vendors here sell these products, I got my half shaft from LPE, my main shaft from Rockland Standard and my diff/tranny brace from DTE, if that helps at all.

Mike

(bear in mind that a hardened half or main shaft is not an 'end all' answer and these may even become more brittle than the stock shaft after continued racing and may require replacement from time to time)

 

[2002Z06Yellow]

I told you NOT to use the slicks with your stock rear end! give me a call!

 

[FRC Tom]

A hard lauch at the track will snap the halfshaft real fast. The next in line is the transmission shaft. I've seen quite a few brake right through the dif. breaking both the trans. and the rear. Next would be the short half shaft or pinion shaft, then comes the impeller shaft in the torque tube.
I've broken them all at one time or another.

Have Dynotech build you a rear, that's what I'll be doing.

 

[405bhp]

guys its not the diffrential shaft.... its the shaft between the tranny and the diffrential that broke.. is it called the main shaft?
whats the best upgrade for this shaft?

thanks

 

[405bhp]

my differential is fine, i got it from Phil @ DTE, but it has some noise i think its from the fluid i used. As we dont have the Redline oil available in the country so i had no other choice. Phil is going to take care of this problem, i spoke to him yesterday

 

[Paul]

300M main output shaft from Rockland Standard Gear.

 

[FRC Tom]

guys its not the diffrential shaft.... its the shaft between the tranny and the diffrential that broke.. is it called the main shaft?
whats the best upgrade for this shaft?

thanks

That would be the transmission main shaft.

 

[405bhp]

That would be the transmission main shaft.

tom, i think its the halfshaft that broke.

to anyone who drag races just becarful while launching with D.O.T tires.. they're too sticky that its possible to brake things!
which vendors sell a upgraded halshaft?

thanks
ebrahim

 

[MikesZ06]

tom, i think its the halfshaft that broke.

to anyone who drag races just becarful while launching with D.O.T tires.. they're too sticky that its possible to brake things!
which vendors sell a upgraded halshaft?

thanks
ebrahim

ebrahim, if it's the shaft going out of the tranny and into the differential, it's the main shaft, not the half shaft.
As Paul indicted above, you can get a 300M output shaft from Rockland or other companies.

Mike

 

[Kat]

A hard lauch at the track will snap the halfshaft real fast. The next in line is the transmission shaft. I've seen quite a few brake right through the dif. breaking both the trans. and the rear. Next would be the short half shaft or pinion shaft, then comes the impeller shaft in the torque tube.
I've broken them all at one time or another.

Have Dynotech build you a rear, that's what I'll be doing.

We have had a lot of problems with the driveline as of late. The only rearend we scattered was a Dynotech. All of the rest (3 others: 2- 3.73's Motive, 1- 3.42 OEM) rear failures were gear face erosion that caused howling. These failures were "cheap" as far as failures go. When a rear explodes, you are looking at big bucks, figure $5000 parts and labor. Gauled gears are about $1100 parts and labor.

But with the other 3 rears, different components started to fail. Trans output shaft sheared at broach (crystallized metal) and bell housing failure. Apparently launching torque was finding the "weak link" in the driveline.

We are thinking the Exedy clutch hit too hard, so we are trying a softer clutch. We are now running a "Getrag 3.73" to see if it survives.

And we are crossing our fingers.

 

[405bhp]

We are thinking the Exedy clutch hit too hard, so we are trying a softer clutch. We are now running a "Getrag 3.73" to see if it survives.

And we are crossing our fingers.

exactly!
i think the twin disk clutch hit too hard and the weakest point at the launch was the main shaft!
stock clutch used to slip whenever i had a hard launch so less pressure was there..

 

[405bhp]

ebrahim, if it's the shaft going out of the tranny and into the differential, it's the main shaft, not the half shaft.
As Paul indicted above, you can get a 300M output shaft from Rockland or other companies.

Mike

yes mike you're right.. its the main shaft.
ill contact rockland..thanks man

 

[Kat]

ill contact rockland..thanks man

We also have the Rockand shaft.. As a matter of fact the whole trans :yeadog:

 

[Paul]

yes mike you're right.. its the main shaft.
ill contact rockland..thanks man

I don't want to pitch you something you may not want but I have a tranny built by Rockland that I'm selling. It was built a couple of weeks ago. It'll hold up to about 700 rwhp.

 

[alssiri]

WOW :jawdrop: I thought the main shaft is the only weak part in there.Hope you get things together soon. :z:

 

[405bhp]

I don't want to pitch you something you may not want but I have a tranny built by Rockland that I'm selling. It was built a couple of weeks ago. It'll hold up to about 700 rwhp.

paul, send me an email with more info :thumb:

 

[405bhp]

WOW :jawdrop: I thought the main shaft is the only weak part in there.Hope you get things together soon. :z:

dude, it was the main shaft
thanks anyway

btw you should give us a visit to the drag strip, let me know if u have any plans