ellis93 wrote:revemup15 wrote:Are the internals of a gas nv4500 same as diesel nv4500 besides the input?
Nope,the cluster(counter shaft) is different. My knowledge is quite limted tho,I've only been in 3 diesel 4500s and 4or 5 gas burner. Of course you can press the front gear on and off the cluster,on early gas burners, effectively changing what it would work with,of course with that gear being keyed on that shaft your Cummins would eat it,least thats what I think.
Boy... has this thread taken off. It sure is great to see the interest.
But corrections are needed here. Ellis, I don't know you and I think we all are contributing members to the first gen community. You spoke about a homejob 5th nut tool, and thats fine if it worked for you. But for me and anybody else that values thier body parts a little advise tightening the 5th gear nut to 325-350ft/lbs. If your homade tool fails and slips you will go for a ride, imagine putting your fist into concrete when that energy is released... the medical bill surpasses the cost of a 5th gear nut wrench at $50 or so
. Just a thought, I want people to save a buck and stay in one piece. I don't want to help someone injure themselves with my advice. A friend of mine had the tool and just gave it to me, along with the 29 spline mainshaft socket, I have used the heck out of it and helped others in the process. If I could find somebody with a laser table willing to make these I'd have a bunch made and sell them cheap to get the cost of the tool down. As for the other special tools, I bought only a few, made some, and came up with safe reliable alternatives for the rest. They are much to costly.
As for the tech on the countergear, that information is incorrect. There are differences between the gas and diesel NV4500 and the countershaft is not one of those. The 92-94 GM ones are oddballs with a different input shaft tooth count which carries over to the mainshaft. Here's the catch the early design countershafts are 2 piece and the front gear presses off. They made a dodge version of that shaft so you just could swap those gears and go to a dodge input.
The real countershaft swap issue comes between early cases with the wide reverse idler and the later units with the narrow reverse idler. Due to the reverse ratios changing in 1997 with the idler change
The real difference in NV4500HD and a gas version is that the size of the mainshaft doesn't neck down near as much behind the rear case bearing on the HD unit, which required a different mainshaft 5th gear with a larger spline size. The cases don't look any different, and almost everything in the main case (depending on the year and application) is the same part between both the gas and diesel version.
I would like to give some credit to Mark Nixon, some time back he was saying how he noticed alot of the parts for the NV4500 are not listed as diesel or gas, he thought that was interesting. I did my own research and actually built a 98 GM 2WD core into a 98 dodge 4x4 diesel unit, I made reverse synchronized as part of the change as well.
There are some design considerations with the NV4500 one needs to familiarize themselves with before trying to build this out of that.