Jamesrooney"Quote- I did read your other thread, and appreciate all of the effort that went into getting a PS pump and return lines that works. I also understand that most people are not steering AND stopping at the same time. But off-road driving makes things more complicated. Because Steering and stopping at the same time becomes interesting. That being said...I am baffled by your choice of a 4R70W. I despise my JKUR with the automatic because I am constantly overdriving the brakes. With my Bronco and NV4500, I don't use the brake pedal except when I actually am not moving. But it is what it is..."
Thanks for the reply on my attempts at PS pump/gpm flow/etc to make everything work...
Aaahhh, the auto/manual pro/con debate...
I don't run a 4r70w anymore, but I do have a 6r80 now. I ran nothing but manuals my entire life in 4wd (except one brief encounter with a C4 and I swore I'd never own another C4) BUT... my best off road manual setup was a ZF/203/D20 up until running my 4r/Klune/Atlas. Great gear selections in the truck boxes but sooooo dang limiting when trying to do anything other than crawl in the gear you are in. Gear splits are way too wide and slow. You have to pick one and go... Even on rocks by the time the clutch is in and you've moved the "stick" and the clutch you are stopped or your momentum has slowed enough that the higher gear you want is now useless. Try this while in deep, I mean deep, heavy, wet snow and when the clutch is pushed in you will have lost all momentum, meaning you have to shift back to the gear you were in and try it all again... and often for us when you lose momentum, you need to be strapped because you cannot get moving again.
A ZF/NV4500 type trans is pretty much worthless in the steep dunes also. Just can't get a shift in and if you do, the rpm drop is so bad that unless you're running 800hp you can't gain the rpms back for wheel speed to the top. Or when you need to shift down the split is so great that besides almost coming to a stop because the dune is so steep, you have lost all wheel speed- - and soft sand is all about wheel speed for heavy Broncos...
I am basing these comments on my decades of fighting this over and over and... over, literally in my backyard. So this is why I went with the 4r70 and it changed wheeling in snow and sand so much it was almost unbelievable. Several local buddies have done the same swap now (since we all wheel together) and they agree- they'd never go back. The auto in the snow is a whole new ball game. Not as beneficial if the snow you are in only allows crawling with the valve stems pulled as the auto and manual are much more equal.
With the 6r80 & USShift controller you have full auto but more important, you have 100% full manual shifting control at all times. The TC is your clutch and you stop/start or shift anytime you want. My TC will stay engaged in manual mode till 850rpm so I have braking ability with it till just above idle... not the same as a zf doubler option crawling down a rock face but I have just as much control with 4 large discs providing the same service(HB does make applying the pedal easier) ...more important is IF I need to pull out of a hazardous back end over the front type situation I can hammer my 6r and it will shift multiple times quicker than any manual- possibly saving an endover...
Guess I'm saying w/o hesitation
I'd never go back to a manual as I'd be eliminating the huge advantage of applying power to the ground for sand and snow when needed.
Back to brakes... since the HB takes about zero flow but needs some pressure how small of a belt driven pump could be used? I know rack and pinion cars use HB and they only use/need 850psi for the rack so I wonder what else out there could be used for a dedicated HB only pump?
Or am I waaay off track... again??
