c15 went bang

Not sure. I do know that they have a lot of trucks with 500+ on them. Probably just worth running them a little more because of money. I know we were all told about the input shafts failing in these trucks to. They were telling us it is from drivers starting in 2nd and 3rd gear being loaded really heavy. To much torque on the input shaft and its twisting it and snapping after excessive abuse. Not sure how or why you would want to start in 2nd or 3rd with these 13s with 45K on the skateboard, just does not make sense to me. I start out in low more in this truck then I started in first over the period of a year with a 10 spd.

 

Yeah well that makes 2 of us that do not understand why some drivers do the things they do. That transmission was given the gears it has for a reason, TO USE THEM but some dont realize that I guess LOL. Ride out that clutch starting in 2nd or 3rd and your costing your self money by pre mature wear and by the truck being down for a worn out clutch. That is if you dont blow it out on the side of the road.... Whatever that just irritates me when people beat on equipment. I think I might be the only freakin company driver out there who actually waxes his company truck. LOL

Good luck again with everything.

 

starting in the wrong gear --is it going to put more torque on the input shaft?
if anything the clutch should slip long before you break off an input shaft

 

Man I know what ya mean.
I drove a 88 Mack Tri-axle with over 880,000 miles on it, (just over the summer) and my boss rode with me to see how well I drove the oldest truck in the fleet.

All his other trucks were newer Mack's or Granites.

After I had gotten loaded with 22 tones of 2AMod stone, I started leaving the yard in low 2 then, 1st, 2nd, and so on. The boss was slightly irritated with how I shifted the truck, and I asked him whats wrong.

He said I was needlessly using the wrong gears as I was shifting thru the gears. He said all I needed to do was stay out of low and float second to get the truck moving. I asked him if that's how he drove his Mack Granite, and asked him how many clutches he burned out of it. He replied the engine's torque was more than enough to get the truck moving without the lower gears. I answered that since my Mack was a LOT older with more miles, I did not want to damage his truck by overusing the clutch.

(I do only use the clutch on take off by the way, and shift clutch-less on all the trucks I drove. He even said I did THAT wrong.)
I asked him if he heard or felt me grinding any gears at all, or missed a shift, and he didn't reply.

Needless to say, He was later seen having his rear serviced a few weeks later.

Kimmyskunk

 

That depends also on what the clutch is rated for and what the trans is rated for. If they put a 2000 ftlb clutch in and the input is good for say 1650 or even 1890 which I know those 2 are the most common 13 speed ratings then that clutch will hold as long as it is properly adjusted. It all depends on those things. That was a big big problem dodge had with there NV4500 they put behind there cummins from 94-98. They would snap the input shafts like it was cool and that is on a stock clutch.

 

Almost looks like the TO bearing seized up and caused that

 

that kinda sucks--but its life i guess--i too think it must be a defect in shaft--it should be able to take what ever is coming out of the engine