Advice for building nv4500 for around 600 horse?
 

Story is my input shaft snapped, input shaft retainer and unfortunately the bell housing is junk too. While I have the tranny out id like to make it as solid as i can because I only see more horsepower in the future and id like to get some advice on a build. Also what seems to be the best syncros as my 3rd gear is going, might as well hit those up too while im at it. any ideas would be greatly appreciated thanks

Really there isn't much to do besides the billet 1 3/8 input shaft kit, as far as the synchro's go I just went to my local transmission shop and bought them.

@ the OP are you on a stock clutch? If so then a double disk clutch should be part of your build.

Like cummins270 said not much to do ohter than upgrade input shaft.

Dodge Cummins 12 & 24 Valve 5 Speed Performance Clutches

Right now i am running a Valair single disc rated for 600 horse but i would probably be a good idea to put in a dual disk