I went to the track on Wednesday and broke the truck. Didn't know what it was but got the news today was the output shaft. I know at my powerlevel this doesn't happen very often just wanted to know if it's anything I did
Broke my output shaft at the track
- Thread starter BUST'EM 504
- Start date
Could have been worse 
you comin back for scrapin the coast saturday? Im gonna run now that i got the limp issue fixed and may try to spray it to the 11s.
you comin back for scrapin the coast saturday? Im gonna run now that i got the limp issue fixed and may try to spray it to the 11s.
Yea I the fella at the tranny shop said this is the third one he has seen go since he has been building them
Is this the same guy that built your transmission? I might find someone else to build mine. I'm not saying they can't break, but I ran very deep into the 11s with a stock output at almost full weight without any issues. Unless you and the other two guys he has seen break are running some serious power, I would suspect something else is going on.
I'm not sure I understand what you are saying? Do you mean the fillet between the threads and the splines?
It's called fatigue failure. Happens to axle shafts in the 4 wheeling world all the time. The shaft wasn't fine and then all of a sudden you broke it. Most likely you have been repeatedly stressing it to or near it's yield point. Eventually, a fracture forms, and that's all she wrote.
I better watch mine I'm like Josh I have been very hard on my truck and I still have stock shafts.
No I get that totally , and is exactly what I think happened. I was just curious what Josh was saying that if it was the same guy telling him that he had seen three or so broken shafts before , that it was somehow
tied to the transmission build ??
I don't know how it could be screwed up, but I was just saying I haven't heard of many breaking. If this guy says he's seen 3 in transmissions he's built, maybe he's doing something wrong. I wouldn't think a truck under 700 HP would break an output shaft.
I didnt say this guy built every trans he has seen fail. This guy has been building high horsepower trucks for a while including an lmm in the 10s on stock shafts he knows his stuff. Mine was the third truck in several years he had seen, a fella from suncoast said this is the third one he has seen ever. I dunno they were both very surprised. I just wish it didn't happen to me.
I understand what you mean I would be skeptical if this guy has built 6 transmissions and 3 broke their shafts.
Yes. That is where they all break clean. The new LML output shafts are much thicker.