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3.90's will be better. But 3.07's can work if you aren't crazy heavy. The ideal ratio would be somewhere around 4.5 but AFAIK there's no one making R&P sets in alternate ratios. 3.07's are what @ckouba is running and he's probably as heavy as I would recommend with that gearing and power -...

In the neighborhood of 10. Depends on how fast you drive.

In stock form the hand throttle won't work as a cruise control because it's not supposed to bring the engine up to near redline so it won't let you do highway speeds. But with the ECO hubs it probably kinda works. But won't disengage when you hit the brakes, etc. Using the hand throttle for such...

Lots of issues with just about everything that guy has to say. Clearly doesn't know his fourth point of contact from a hole in the ground. Please don't go on YouTube and talk about military :poop: like you know about military :poop: when you clearly haven't been in the military and aren't...

Everyone here understands what you are trying to say - and it WOULD NOT WORK. What you are proposing locks the hub to the outer gear, which then is locked to the inner gear via the planetaries, which in turn is locked to the AXLE TUBE. This renders the entire system immovable. In other words IT...

Yet again you show in painful clarity that you fail to understand what's happening in the hubs. 🤦‍♂️ Someone please help me out with explaining this. I've lost the will.....

You asked a question - when it was explained this would be very difficult by two members you made assertions of it's simplicity and further assumptions. By doubling down on the comment it was clear I needed to explain in further detail what disastrous consequences would befall the person that...

You don't understand how the planetary system works. You can't just couple the outer gear to the hub cover - you must also decouple the inner gear from the splined axle tube. If you don't you will IMMEDIATELY destroy parts inside the hub. Remember that the axle is spinning at twice the speed of...

Those are CTIS armor. Yes they will fit. I reinstalled a set on a one of the 4 trucks I've converted to ECO hubs.

So here is what Allison DOC says in the help files and what options it gives. It looks like you want the "Low Preselects" to shift the RPM down by 150 RPM. Not exactly sure because I haven't tried it and the software selection isn't well coordinated with the help files in terms of...

Ah yes - I missed the smell of ozone and burning insulation! Such an obvious example. Some of the "enthusiast" vehicles I have occasion to work on often have an "interesting" take on wire management, routing, and shall we say..... "best practices and standards" o_O

Some versions of CAT ET will give that complaint but still make the change anyway. Try changing it, acknowledge the error, and then switch away from the settings page and back again. I've run into that a time or two. You switch off the page and back again and the setting was programmed in spite...

Well - I can definitely smell brakes being worked hard or dragging, clutches being slipped, belts dragging over seized pulleys, and often coolant and oil leaks as well. Sometimes before I can see evidence on the ground. Hot grease and fluids being flung onto the exhaust from driveshafts makes a...

I meant how the engine manufacturer (CAT) intended for the cruise control / exhaust brake to function based on the programming options. Obviously the truck manufacturer never intended any of these systems to integrate. The cruise control is nice for longer jaunts where you can get out on the...

Not argueing with the CC integration. I setup the CAT ECM to integrate the cruise and exhaust brake when I enable cruise control as well. That works as designed and as programmed by CAT. I have no issue with that. I get what you are complaining about - higher speed when the cruise control...

I don't think you'll get any significant braking effect in 5th or 6th gear unless you are going REALLY fast. And globally limiting it to 5th will mean you don't get any braking effect at medium speeds where it was only in 5th starting downhill. I was at the grocery store last night and on the...

Probably would get more visibility that way. The oil pump discussion applies to all trucks - even more so to the factory hub reduction trucks being they will wear out the flawed pump designs faster.

I would just get it from CAT. Unfortunately there's no way to know which design the third party companies decided to copy and things like the pressure relief valve and spring must be absolutely precisely made. I've seen aftermarket oil pumps for other engines that had sticky pressure relief...

Yeah your pump is trashed. Check out this video on a 3126b pusher RV with 92,000 miles - and remember mileage is irrelevant because our engine's spin 1000 rpm faster at highway speeds (without ECO hubs) than this RV so wear rates on parts that have known design flaws are accelerated:

@Lostchain reports ~40 psi at hot idle. My truck is ~22 psi at hot idle. Before the oil pump change his pressure was below 20 psi - sometimes would not read on the gauge if it was very hot and he would get an oil pressure warning. His old pump looked pretty good just on a visual inspection -...