As I am sure you know their are a lot of thing people are tight lipped about. I have taken a few apart in the past to swap swashplates in the 94.5-95 trucks and I had taken pics of disassembly and assembly. Unfortunately they were on my Dell laptop that crapped out on me a few months ago.
The swashplate is pressed in. It has been almost a year since I have done one so it is hard to remember exactly but here the basics.
First step is pull the shaft, front seal and rear plate and drop a bolt in with a couple washers on it that are big enough they will not slide threw the barrel. I actualy had to grind the washers to fit just right. Then I put a washer and nut on the end coming out of the swashplate and tighten it down to compress the barrel and plungers to the swashplate.
Then you use the head of the bolt to push the whole assembly out the back side of the pump. If you do not have a press to do this with you can drive it all out with a hammer and a punch. Driving it out will usually gauld the edge of the the center of the barrel where the shaft comes threw but it will not hurt anything so don't worry about it.
Then when you put it all back together you just do everything in reverse and the bolt will hold the plunger, barrel and swash plate all together for easy assembly. Just be sure you clock the swashplate properly.
Thanks for that info. It's a start. I'm in the machine shop business. We do high-precision CNC machining for several high end customers, so I really have no desire to jump into the high performance HPOP
market. Several others are there already and it just isn't worth my time and effort.
But I am a tinkerer and a hobbyist and a DIY
guy. I just enjoy taking sh!t apart to see how it works and how to easily(and cheaply) masssage it a bit and make it better.
These HPOPs are basically just a mass produced, run-of-the-mill piston pump. The manufacturing tolerences are fairly loose so that they are easy to produce in mass quantity. That's precisely why some trucks, stock, run so much better than others. One gets a pump that, by sheer accident, is fitted to much tighter tolerances and the next one gets a pump where the fits are loose. They both are in tolerance but don't perform the same at all.
I assume these guys that are modifying the stock pumps are installing new, custom machined components and they are machined and fitted to much more precise tolerances. One vendor, in fact, advertises this very point when he says
"EVERY A******* PUMP IS BUILT EXACTLY THE SAME. EACH PUMP IS TESTED BEFORE IT LEAVES HERE.
THERE IS ONLY ONE PUMP VERSION AND IF YOU ORDER AN A********* IT WILL BE BUILT TO THE SAME SPECS AS THE NEXT GUY."
This guys thoroughly understands the concept of precise tolerances.
He has to, he's telling two buddies that if they put his pump on both their trucks, all other thing being equal, that one isn't gonna smoke the other one's azz.
Another designer/vendor is machining an entirely new housing in order to install his design of modified components. Looks way cool but it's expensive when you start from scratch with a chunk of billet aluminum. I know, I manufacture parts every day! The material is expensive and so is the labor.
For me it's more of a curiosity thing. I would most likely just buy one if I was looking to do some mods on my truck.