Nv4500 GM to Cummins input shaft update

[@kevingilpin6707]

I'm wanting to swap a 12 valve cummins into a 98K2500 chevy and manual swap it at the same time, what all would I need to do to use a chevy NV4500 to bolt it to the 12 valve I know I need the dodge bellhousing and the 96 and up chevy nv4500 but what would I need to change about the trans? Thankd

[@Fixinjunk]

It needs to have a 1.25" Input shaft installed, if it isn't already, no matter what. If you use a transfercase off of a GM, most likely your going to need a 32 spline output on the nv4500 (dodge used 29(Diesel) and 23(gas) splines. Your best bet is to get a NV4500 from a gm 4x4 truck

[@slapzy7323]

ive got a quick question ive found a nv4500 for a good deal around me bc i haven't found any dodge ones near me but what all is needed besides the tailshaft housing to convert a 4x4 to a 2wd

[@Fixinjunk]

I honestly don't know what conversion a 2wd nv4500 to a 4x4 entails, might need an main shaft too

[@tslucam]

Great info. Thanks for the vid. Question for you. I have a model year 94 from a GM with the 6.34 first gear. I was thinking of putting it behind a 4bt/6bt but I think I heard you say I'd be out of luck. Is it true nothing can be done?

[@Fixinjunk]

Well its not ideal and not really worth it, but you can, because the Cummins input shaft has a different amount of teeth you would have to change the gears in the transmission so It could work. If thats the only nv4500 you can get maybe its worth it but other wise I'd try to find a nv4500 out of a 96 and later gm truck it will make your life so much easier. you would lose the 6.34 gear. My opinion you don't need the 6.34 any ways thats so low of a gear if you got low range in your transfer case you can just use that. Thanks for watching good luck with your project

[@tuckerfinnicum3949]

So I just need to buy a dodge input shaft that's 1 ¼ 10 spline and 22 tooth and that's it?

[@Fixinjunk]

with the bearing retainer, get one with a new bearing and race too, as long as its a 96 and newer nv4500

[@tuckerfinnicum3949]

​@@Fixinjunk can you use the gm clutch? Or do I gotta get a dodge one

[@Fixinjunk]

@@tuckerfinnicum3949 dodge flywheel and clutch

[@lancow1234]

So on the 96 and newer gm units do you have to redrill the bell housing bolts?

[@Fixinjunk]

no, unless you wanted to put a 95 and older gm bell housing on

[@MudSlingerRacing21]

Hey had question so was wondering what your top speed was I did 12v swap in my 95 chevy k3500 had nv4500 in it changed the input shaft and the retainer drilled holes and all that stuff but I have only got to like 60mph but sound like it is screaming

[@Fixinjunk]

in 5th gear, 4.10 rear end, top out at about 75mph. I've driven down the interstate screaming haven't had an issue

[@MudSlingerRacing21]

@@Fixinjunk yeah I don’t have my tach set up yet just sound like it is scream at 60mph yeah stock dually rearend I am doing some upgrade to my injection pump just don’t want to be blowing up when I start towing my derby cars my nv4500 is stock one out of my truck

[@Fixinjunk]

@@MudSlingerRacing21 Just got my tach to work. I'll upload a video on that. I towed a 8k camper 300 miles on i-84 PA passing trucks up Monticello. Passing cars is scetchy. It really needs 3.73 for highway driving. At 50/60 its doing 2100rpm, kinda like a tractor working all day I'll be ok

[@MudSlingerRacing21]

@@Fixinjunk sweet yeah if ya can do a video sweet I was just going to run my wire to my alternator

[@MudSlingerRacing21]

@@Fixinjunk Hey how are you doing I had one more question for you did you have trouble bleeding the clutch after you did your envy 45 behind your Cummins mine is still pretty soft and I bled the crap out of mine if I get in the truck and just press it to the Ground egg kind of grain is a little bit and goes in gear play pump Up in 0123 times then it’s fine