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Carnage share thread

JR4X said:
Never ran Yukon’s with 800 ft lb of torque and 40’s, can’t personally compare. I’m not convinced that 300M is better than 4340.

The rest of the story. Pre running, Bender Alley, we got hung up, dad bumps it and the drivers side (short side) inner lets go with no noise. John Currie helps get us out and we go back to pit and put our spare in. Spare inner is an RCV 4340 that we’ve had for forever. Race the EMC on 37’s with one 4340 one 300M, no issues finish 6th in class. 4400 race on 40’s Bender Alley again. Kevin gets hung up gets horsey with it and the long side 300M lets go taking out the locker and seal housing. 4340 shaft fully intact.

Supposedly 300M is stronger but 4340 can take way more degrees of deflection and return to normal.
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Define "bump" please. :lmao:


As you know, harder isn't always stronger. Its all about the usage and selecting the correct material for that usage. I would think a material with more give (4340) would be preferred for axle shaft material in the endurance rock bashing game. I would rather twist an axle shaft/splines during the event and have to replace it at the next race prep than to have the "strongest" shafts on the planet that snap instead of flex when overloaded.

Do you guys plan on going back to or at least trying 4340 shafts after learning what you did?


Edit: 800ft lbs of torque is :smokin:. I bet that car is a blast to drive!
 
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the history of the shafts is also a factor, how many times has that 300m almost broke but didnt, unless you do a bunch of testing its all conjecture
 
JR4X said:
Never ran Yukon’s with 800 ft lb of torque and 40’s, can’t personally compare. I’m not convinced that 300M is better than 4340.

The rest of the story. Pre running, Bender Alley, we got hung up, dad bumps it and the drivers side (short side) inner lets go with no noise. John Currie helps get us out and we go back to pit and put our spare in. Spare inner is an RCV 4340 that we’ve had for forever. Race the EMC on 37’s with one 4340 one 300M, no issues finish 6th in class. 4400 race on 40’s Bender Alley again. Kevin gets hung up gets horsey with it and the long side 300M lets go taking out the locker and seal housing. 4340 shaft fully intact.

Supposedly 300M is stronger but 4340 can take way more degrees of deflection and return to normal.
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Superjeep Carl Jantz went into detail on Comp Cut axle shafts and how they can be “tuned” at the other place.
 
SLOWPOKE693 said:
Define "bump" please. :lmao:

Do you guys plan on going back to or at least trying 4340 shafts after learning what you did?


Edit: 800ft lbs of torque is :smokin:. I bet that car is a blast to drive!
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We stepped up to 300M after breaking 4340 so probably not. If anything we should probably go to 40 spline.

It is a blast. With the desert tuning in the shocks and neutral suspension, when you mash the gas it pins you in the seat and points the nose of the car to sky. A little bit of throttle makes for a big bump though.
 
This is a 5.3L vs a stock Dana 18 transfer case in a 1951 Willys M38. The 5.3L won. It even bent the case.

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JR4X said:
Holy shit, is that big shaft a drive axle from a big truck tractor?
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Yes sir. Happens all the time. 2.5” 47 spline IIRC. Dana axle. They break carrier assembly’s, shear pinions, bust side gears, crack housings, you name it. Usually it’s a foot slip off a clutch, or the truck bounced with 80-90k weight.
 
My buddy broke one

He was backing up a driveway with a load of asphalt. He was at idle in reverse and when the rear drives popped up onto a 6" step, it broke one of the axles :laughing:
 
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Top is a backfire on a draw through turbo NG engine I was running

bottom is a stock tired farm truck with an open front axle that exploded when the hired man got stuck.
 
Broke a 1st gen D60 RCV on Backdoor last Feb a week after KOH. Yes, they stood by their warranty. Very good customer service! Stock 14 bolt shafts hung in there...
 

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Clb said:
Details on the rcv birfgrenades?
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Not sure if you're referring to me but it blew on backdoor. I was throttling down, rig was bouncing a bit and the front passenger tire must have caught traction on "RCV rock"...lol. I was halfway up, the rear tires where spinning against the top ledge.
 
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DesertCJ said:
Broke a 1st gen D60 RCV on Backdoor last Feb a week after KOH. Yes, they stood by their warranty. Very good customer service! Stock 14 bolt shafts hung in there...
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I agree, good service. I broke a 35 spline inner and twisted the other inner. Custom length 300m from Bobby Long. RCV warrantied them.
 
YotaAtieToo said:
Taco frames are so cheasy from the cab back. Was that boxed in or stock?

Tube back half time? :flipoff2:
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Not boxed but had frame plates. It actually bent forward of the rear most cab body mount which is weird. I was crazy bound up, winching off a boulder I was high centered on, the pax side ass end was in a hole and wedges against a wall, with it in double low, stalled the winch out a bunch. I bent the slider as well so my guess is it was the angle and where I was that did it. The frame is still a rusty POS.

Back halfing is on the table, I just need to see how to get it to pass inspection as I don't have a tow rig and drive this to the trails and NC is gay and has safety inspections. Other option is to frame swap it. In the interim I will weld some plate on there and let er rip.
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