nv4500 help.

I'm in the middle of a nv4500 out of a 95 5.9L 3500(gas motor) swap into my 98 5.9L 1500. I thought it would be nice to have reliable tranny in the truck. The 46re wasn't working for me. I got everything swapped over and the truck running but I can't get it into gear while its running. If I shut it off and start it the truck creeps forward. I have a brand new clutch set, clutch fork, fork pivot, and retaining spring. I had to buy a 98 master to fit the firewall but bought the 95 slave not knowing the 95 slave is different from the 98 just like the master. I've. Pulled the trans twice and double checked my work and its fine. I'm going to try the 98 slave tomorrow but if that doesn't work could it possibly be a bad pressure plate even though its brand new? I don't want to pull the trans again but I need some ideas. Thanks everyone.

kempkan.
Nice swap you are do'in. Works very well. You have have air trapped in your hydrolic system would be my forst guess. Hydrolic clutches and motorcycle front brakes have become very hard to bleed for about the last 10 yrs. Reason-- the viscosity of the fluid
has been changed for the fancy anti-lock systems just like the engine oil. It is a lot thinner.
It used to carry air bubbles and not let them travel up hill. You need to une a pressure bleeder to push the fluid down to the slave fast or the bubbles will creep back uphill between pedal strokes. Or rig up a 3-5psi small psessure can with air on top and a washer hose fitting and hose on the bottom to push fluid up from the slave bleeder to the master. I did this years ago to bleed motorcycle front brakes. Another thing to chech is if you can't get a straight shot at your clutch disk and put a feeler guage between the disk and the pressure plate when it is disengagad to check for clearance. Use a 1" hole saw directly in line with the disk on the bottom of the bellhouseing so you can cheak the gap from the disk to the plate. you want minium of .040" max about .070
Or you will have hars shiftine[g at higher rpm. Amd make shure you une the dealer oil for that NV4500. It is expensive and the part # is on the PTO plate on the tranny. YOU HAVE TO USE THAT OUL. The syncro rings are a phenolic not brass and it will with all other oils.
There is a GM and CHRYS part # on the tranny for that oil. The phenolic syncros will swell and stick and will tear up the trans. The NV3500 that was in the 1/2 half tone was the same way. and the oil has th be changed around 50,000 miles.
CHRY #12346190 GM#4637579
You will loose the tranny with any other oil. And over fill with an extra 3/4 quart.
I think it will take 4 3/4 quarts to fill.
Any questions PM me and I will explain why I know this. It was my job to keem a bunch of these trucks running in the Colorado mountains pulling these big hills with heavy trailers.
Take care,
Rick