View Full Version : Broken 5.7L (RT) Half Shafts?
RT NOMAD
11-25-2007, 11:02 AM
Wasn't sure what forum to post on.
Knowning that there have been quite a few SRT half shafts broken, I'm wondering if any 5.7L (RT) half shafts have been broken.
Has anyone broken the half shafts that are stock on the 5.7L LX's?
Hurst Equipped
11-25-2007, 11:03 AM
i haven't heard of any yet.
Magnum375 Jr
11-25-2007, 11:04 AM
As I understood from a few different threads...I had read that the 5.7 half shafts were supposedly like indestructable, compared to the 6.1's.
MattRobertson
11-25-2007, 11:44 AM
We all have some guesses why but nobody really knows. The 5.7 halfshafts seem to be the shiznit no matter what you do while the 6.1's are a ticking time bomb if you mod the car up to a certain point..
are the halfshafts on the 5.7 and 6.1 the same?
Leadfootluke
11-25-2007, 11:51 AM
are the halfshafts on the 5.7 and 6.1 the same?
Nope...
RT shafts are unearthly cheaper, but will not fit correctly.
Trojan
11-25-2007, 11:53 AM
are the halfshafts on the 5.7 and 6.1 the same?
No, the 6.1's have been breaking, No one has yet to bust a 5.7 half shaft.
That being said the 5.7's have just recently discovered HP/TQ well over the 400 mark, that and some 315 DR's and were gonna find out real soon how they hold up.
RT NOMAD
11-25-2007, 12:39 PM
No, the 6.1's have been breaking, No one has yet to bust a 5.7 half shaft.
That being said the 5.7's have just recently discovered HP/TQ well over the 400 mark, that and some 315 DR's and were gonna find out real soon how they hold up.
This is what I'm asking for.
Financially, I'm not in the position to pioneer test grabbing via drag radials over 400 hp/tq with my RT. Lou1355 is on his 3rd Quaife. It seems tha when the half shaft twists it does so in such a fashion as to seize on the Quaife.
MattRobertson
11-25-2007, 02:30 PM
Thats why I won't be drag racing mine; at least not until we've had more experience under our belts. My track tires aren't DR's but they are 2" shorter than stock, and very sticky. And I have a Quaife. And a converter. And a big motor.
Trojan
11-25-2007, 02:38 PM
Ok so someone tell me what's exactly gonna happen to the car/driver when the 1/2 shaft snaps? Im going to the 1/4 mile friday with tons of TQ and 315's. Id like to be a bit more prepared. although I dont think there gonna snap Id like to plan for the worst and hope for the best.
1FST4DR
11-25-2007, 02:46 PM
This is what I'm asking for.
Financially, I'm not in the position to pioneer test grabbing via drag radials over 400 hp/tq with my RT. Lou1355 is on his 3rd Quaife. It seems tha when the half shaft twists it does so in such a fashion as to seize on the Quaife.
Do you know if lou is on his 3rd quaiffe while using his after market shafts?? And to answer the main question,I have not heard of anyone braking stock 5.7 shafts either
Hogward
11-25-2007, 03:12 PM
Thats why I won't be drag racing mine; at least not until we've had more experience under our belts. My track tires aren't DR's but they are 2" shorter than stock, and very sticky. And I have a Quaife. And a converter. And a big motor.
Matt, is your big motor running now? Thought you were gonna tear it down completely for full inspection and checking of dimensions and then make a report on this forum before you installed it.
InferAl
11-25-2007, 03:14 PM
I have had numerous 60 ft times in from 1.65 up to 1.69 and that is hooking up hard for a 5.7 and knock on wood they held up
MattRobertson
11-25-2007, 03:46 PM
Matt, is your big motor running now? Thought you were gonna tear it down completely for full inspection and checking of dimensions and then make a report on this forum before you installed it.Nope its not here yet. The holiday is boofing me on ship time I think.
Well, I watched Trojan bang the **** out of his in AZ last month. 16 passes and no problems. Now I've got my quaif in and a set of DR's coming for this weekends adventures. If their gonna break, I sure as hell wanna be the first guy to do it.
MattRobertson
11-25-2007, 04:38 PM
heck Cam you can be the first *and* the second :D
Leadfootluke
11-25-2007, 04:43 PM
Well, The RT halfshafts wont break the bank, will they? Just beat the crap outta the track and run some good times guys. WIth the DR and the TQ numbers Cam and Trojan are putting up, its gonna be a real test!
Trojan
11-25-2007, 04:44 PM
Well, I watched Trojan bang the **** out of his in AZ last month. 16 passes and no problems. Now I've got my quaif in and a set of DR's coming for this weekends adventures. If their gonna break, I sure as hell wanna be the first guy to do it.
Welp! there ya have it. The stage is set for the " Bust a 5.7 Halfshaft Competition" :racing:
RT NOMAD
11-25-2007, 05:04 PM
Do you know if lou is on his 3rd quaiffe while using his after market shafts?? And to answer the main question,I have not heard of anyone braking stock 5.7 shafts either
From what I could understand from his post in PR&D he is finally going with the after-market 1000hp half shafts after destroying two Quaifes.
Since my motor is essentially the same build as his, before I get too far along with tuning and launching, I got concerned about how robust the 5.7L half shafts were, since we already know the 6.1L ones are on the brittle side.
Go get 'em Cam!
maneval69
11-25-2007, 09:37 PM
As soon as after market gears come out for the RT rear-ends, you will see halfshafts breaking.
Hogward
11-25-2007, 09:46 PM
If Lou has broken several Quaife assemblies, and it takes a twisted half shaft to do that damage, then hasn't Lou already destroyed several RT half shafts? Or what's going one here? Where there's smoke there's fire...
mhigham
11-25-2007, 09:47 PM
Just like this forum to come up with a contest to break something.. :racing: I like it!!
Mike
DeafCharger
11-25-2007, 09:54 PM
If Lou has broken several Quaife assemblies, and it takes a twisted half shaft to do that damage, then hasn't Lou already destroyed several RT half shafts? Or what's going one here? Where there's smoke there's fire...
Lou have SRT Magnum. That's why he have aftermarket half shafts.
I'd like to know what's breaking on the quaif. Something doesn't add up. I know that Quaif had a problem at one point with the halfshafts locking in properly on the 5.7 shafts.
Ghostface Mag
11-25-2007, 10:38 PM
No, the 6.1's have been breaking, No one has yet to bust a 5.7 half shaft.
That being said the 5.7's have just recently discovered HP/TQ well over the 400 mark, that and some 315 DR's and were gonna find out real soon how they hold up.
You can say that again...Some 5.7's on this Forum are knocking on the doors/standing on the porch of some mildly modded SRT's...Let alone running down on a stock SRT :spock:...I guess we will all see in the upon coming year(race season) rather the 5.7's will need upgraded half shafts...
maneval69
11-27-2007, 05:03 PM
One other thing to consider. The electronic braking component of traction control. It works by pulsing the rear brakes to one tire if a difference in speed is detected. I am pretty sure that these systems do not have proportioned hydrualics. So the pulse is full on then full off. This is very hard on the driveline components. The SRT8's have much stronger brakes than the RT. I wounder if under high horspower and traction conditions if the brake pulse is what's causing the halfshafts to break.
The rear brakes of the RT's have smaller pads rotors and calipers. An RT may not be able to produce enough of a shock when the system pulses to cause harm, where the SRT8 in conjunction with the higher gear ratio may cause just enough shock to snap the shaft.
If that possible?
Jweezy
11-27-2007, 05:12 PM
You can say that again...Some 5.7's on this Forum are knocking on the doors/standing on the porch of some mildly modded SRT's...Let alone running down on a stock SRT :spock:...I guess we will all see in the upon coming year(race season) rather the 5.7's will need upgraded half shafts...
knocking on the door of mild SRTs...more like heavy. There is more than a couple 5.7 running faster than 6.1s with heads cam and more...Only 6.1s I know that are in the 11s, are using Nitrous.
I could be wrong.
MattRobertson
11-27-2007, 05:37 PM
The rear brakes of the RT's have smaller pads rotors and calipers. An RT may not be able to produce enough of a shock when the system pulses to cause harm, where the SRT8 in conjunction with the higher gear ratio may cause just enough shock to snap the shaft.
If that possible?
I sure hope not, cuz Cam, CoolVanilla and myself all have big badass Wilwood brakes.
Ghostface Mag
11-27-2007, 05:44 PM
knocking on the door of mild SRTs...more like heavy. There is more than a couple 5.7 running faster than 6.1s with heads cam and more...Only 6.1s I know that are in the 11s, are using Nitrous.
I could be wrong.
That depends on who package you are running...
Let the record reflect...And he hasn't been tuned yet...
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