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I'm likely going to wait until I can find a good HD Allison tech that knows what all of these settings do and how they all interact. The exhaust brake as I now have it set up is, to me, a must for a truck with Eco hubs and will be even better when the target gear is changed. I would also like to...

Interesting, the 370hp tune I’m running is a much later dated tune than what’s come my way via SS, so maybe different in that regard.

Only comments I have are that you have the “soft” cruise set to yes, I don’t like that setting, it expands the over/under speed tolerance before the ECM adjusts the speed. I find the tolerance pretty sloppy even without that on. The other comment would be that I played with the auto retarder...

If you have your cruise set to “latched” in the ECM, your exhaust brake has to function the way mine is. There is no option to have the cruise interconnected with the exhaust brake and have the exhaust brake function as set up by the mfg.

With the cruise set, the exhaust brake does not force a down shift, it ignores the target gear. If it can’t maintain the cruise set speed it will down shift but it’s way mellower and typically only one gear is all that’s required at highway speeds.

Let’s just agree to disagree and leave it that. I’m already doing this and the exhaust brake in the 5th and 6th works perfectly in combination with the cruise control and very affectingly controls your speed on down grades without need to apply the service brakes. With the current setup, not...

After driving around for the day yesterday I am certain I’ll be keeping my exhaust brake setup as it is, with the exception of changing the target gear to 5th most likely. For those of you that like how the brake works now, in the new configuration you really aren’t losing that, it just works...

Out of curiosity, what kind of oil pressure did you see with the new pump in the 3216?

Understood, but the way the exhaust brake works after the mod is way more useful for my intended use of the truck. Given that the mode with the cruise set does not have the aggressive downshift, I will probably have the target gear set to 5th and see how that goes in the other two modes. I...

Continual running of a motor at or near its red line isn’t good. Will these motors stand up to it? Sure, but I can assure you if you take two identical motors and run one a very high percentage of the time at or near its max governed rpm and the other at 1400-1800 for its life, the latter is...

Everyone has their preferences. I vastly prefer the way the brake works now with the changes. I also prefer not having it aggressively downshift to 3rd, which makes sense for the speeds the military drives the trucks, but doesn't for a truck that now can cruise with the rest of the traffic on...

Because it's unintelligent and way too aggressive. If you're in high mountain passes on the freeway going 65mph, if you engage the exhaust brake it's going to aggressively downshift to 3rd and you'll be risking throwing a rod and be travelling at 30 mph when all you wanted was to coast down the...

I don't think there is TC lockup on 1st or 2nd, so no exhaust brake functionality. There is a setting in the ECM for the max RPM the trans should try to maintain on downshifts. By default it set at 2800. Yes, the trans will aggressively shift to the target gear.

Yes the default is 3rd. I want to change it to 5th or 6th. You can always downshift with the key pad if you want a lower gear and the trans isn't yet wanting to downshift.

I know this is the Eco Hubs thread, but since we had some lengthy discussion here about my feelings that an exhaust brake was critical for mountain driving when you have Eco Hubs installed I thought I would post a follow up. So, back to the exhaust brake conversation. Since I have now installed...

Guess I'm waiting to remove and reinstall the other 3 hubs until I can get my hands on the new lock setup. How much for a set of 4?

I wasn't referring to highway gears and eco hubs together, just that with stock gearing you really aren't able to drive fast enough for the tires balance/roundness to be an issue.

I wasn't implying it had anything to do with the gearing or hubs, just that with stock gearing you aren't able to drive fast enough for it to become an issue.

Since I now have about 3200 miles behind the wheel in an ECO Hub equipped truck, and drove in all kinds of conditions on my journey from Maryland to California, I thought I would post my thoughts. Keep in mind that these thoughts are coming from someone who only had about 4 miles behind the...

Nice! I'm on a plane headed for Maryland to pickup my truck next Thursday. Can't wait.