how much hp/tq will a SM456 hold?

[Nospark]

like the title says how much HP/TQ will a SM456 hold.  If so what modifications need to be done to it to make it hold?  input, output, mainshaft ect... anybody have any experience with them.   Thanks for the help

[Grim 82]

In my experience it's pretty tough to break a 465. How much hp/tq is your motor putting out?

[77c10diesel]

I have never heard of a SM465 breaking, most of the time they break other stuff like the u-joints, axles, drive shaft, etc.
I say just rebuild it with quality parts and go. Worry about the other parts more. You will find the weak link and I doubt the 465 will be it.

[Nospark]

in the process of building a 598 for it shooting for around 7-750hp.   I am coming from performance diesels where you could snap a stock input/output shaft like a toothpick.  I was thinking if the Muncie wouldnt hold up to swap in a NV4500 with billet shafts. 

[malibu795]

in the process of building a 598 for it shooting for around 7-750hp.   I am coming from performance diesels where you could snap a stock input/output shaft like a toothpick.  I was thinking if the Muncie wouldnt hold up to swap in a NV4500 with billet shafts. 

go look at the stock street and supper street gass class.. and thats what they are running is a 465 and 1000hp

[Edahall]

I've heard that the weak link on the SM465 is the input shaft, so you might want to upgrade it to a larger diameter shaft.

[Irish_Alley]

There are a couple different input shafts 10 and 32. 10 being weaker not much I haven’t had a problem with mine

[Nospark]

ok thanks guys I will be looking for some upgraded internals if you think it will hold.

[Irish_Alley]

I'm running 38's on mine with no problem