ECO Hubs Who needs 3:07 gears?

[hike]

Here is a spreadsheet (a photo of one) showing the various crawl ratios/mph for 3.90, 3.07, EcoHubs or not. I agree the 3.90's are best with what we currently have and 4.5's with EcoHubs would be cruising 63 at 1,600 rpm in seventh. That would be the sweet spot—

 

[MatthewWBailey]

Here is a spreadsheet (a photo of one) showing the various crawl ratios/mph for 3.90, 3.07, EcoHubs or not. I agree the 3.90's are best with what we currently have and 4.5's with EcoHubs would be cruising 63 at 1,600 rpm in seventh. That would be the sweet spot—

View attachment 923387

I have this chart saved from earlier reads. 73 at 1600 on the 2nd chart is nicer than the last chart. At 75, mine is shifting a lot between 6 and 5 with 3.07 if there's a little hill. I have them so I guess I'll install them (3.90).

 

[Ronmar]

Yea if you are pulling them for lockers anyway, its a better mix...

 

[hike]

I have this chart saved from earlier reads. 73 at 1600 on the 2nd chart is nicer than the last chart. At 75, mine is shifting a lot between 6 and 5 with 3.07 if there's a little hill. I have them so I guess I'll install them (3.90).

I can see that. If I redid the chart for the shift points it would illustrate your point better.

I will be watching your experience with the lockers when you start that thread. I haven't noticed you or @Keith Knight complaining about traction on adventures, is it a bigger issue than I think?

 

[Keith Knight]

On my last 20,000 miles on every type of terrain and trail I have been thankful that I have a rear locker for the added traction and besides the occasional clunk I have not had any problems or issues.

 

[coachgeo]

Here is a spreadsheet (a photo of one) showing the various crawl ratios/mph for 3.90, 3.07, EcoHubs or not. I agree the 3.90's are best with what we currently have and 4.5's with EcoHubs would be cruising 63 at 1,600 rpm in seventh. That would be the sweet spot—

View attachment 923387

can you run this also with same parameters but different tire heights? OEM (45"ish), 14R20's (48"ish), and 16R20 (53ish)... and for shitz and grins... maybe 12r20 (40ish).. might be smart to lower center of gravity on and off road for those building expedition rigs.... ??

 

[Ronmar]

On my last 20,000 miles on every type of terrain and trail I have been thankful that I have a rear locker for the added traction and besides the occasional clunk I have not had any problems or issues.

Thankful for the lockers because you can still spin tires?

 

[Keith Knight]

Thankful for the lockers because you can still spin tires?

Define “still spin tires” please

 

[hike]

can you run this also with same parameters but different tire heights? OEM (45"ish), 14R20's (48"ish), and 16R20 (53ish)... and for shitz and grins... maybe 12r20 (40ish).. might be smart to lower center of gravity on and off road for those building expedition rigs.... ??

Sure.
You want to see the same sheet with variable tire height: 53", 48", 45", 40"

 

[coachgeo]

Sure.
You want to see the same sheet with variable tire height: 53", 48", 45", 40"

View attachment 923414


...

appreciate it. too small for my eyes to read them.. Ill figure something out.

 

[hike]

appreciate it. too small for my eyes to read them.. Ill figure something out.

Attached PDF's, too. Download and then zoom at will, (most browsers will allow you to 'right-click' on an image opening a menu with a choice to open in another 'tab' or save as and then zoom at will)



This site's image handling is challenging in my opinion–

 

[coachgeo]

Attached PDF's, too. Download and then zoom at will, (most browsers will allow you to 'right-click' on an image opening a menu with a choice to open in another 'tab' or save as and then zoom at will)

View attachment 923420

This site's image handling is challenging in my opinion–

didnt see the PDF's at all. My bad.. that works great

 

[Ronmar]

Define “still spin tires” please

lose traction...

 

[hike]

didnt see the PDF's at all. My bad.. that works great

Added them after your comment. A good suggestion you had for PDF's—

 

[MatthewWBailey]

I can see that. If I redid the chart for the shift points it would illustrate your point better.

I will be watching your experience with the lockers when you start that thread. I haven't noticed you or @Keith Knight complaining about traction on adventures, is it a bigger issue than I think?

I'll certainly update once installed. I get stuck in 12" of snow routinely trying to get into the barn. It's not a compliant. Open diffs don't do snow. Should be fine with the lockers.

 

[Aviator4x4]

Edit: Just got to the part in your YT video where you explain it is for just that ! Video @ 11:24

@Xengineguy is this slotted bolt to help clear debris from the 3/8-16 holes the original hub bolts are in ? If so, much appreciated !

Getting smart on EcoHub installation (reading directions, watching a few YT videos on it, etc...) since it is on deck as next project.

 

[Xengineguy]

Edit: Just got to the part in your YT video where you explain it is for just that ! Video @ 11:24

@Xengineguy is this slotted bolt to help clear debris from the 3/8-16 holes the original hub bolts are in ? If so, much appreciated !

Getting smart on EcoHub installation (reading directions, watching a few YT videos on it, etc...) since it is on deck as next project.

View attachment 925188

Yes that’s to clean the rust and years of RTV out of the holes. They must be clean all the way to the bottom of the threads.
The install is easier than it seems…. Make sure to put the adapter plates on correct. The smaller disc goes into the hub to help center it. Call with any questions.

 

[Xengineguy]

Wanted to post that Eco Hubs have free shipping to the US for the next couple months. Includes Alaska! Use promo code “Steel Soldiers”. We have good stock and can ship fast.
Thanks for the support !

 

[Keith Knight]

As I contemplating eco-hubs. My truck is a 2003, 3126 tuned to 330hp with 3.07 gears, weighing 27,600lbs. One of my favorite aspects is the exhaust brake especially going down step 10% grades, narrow 2 lane roads with switch backs every few hundred feet, with no shoulders for miles. Is that I can keep my speed down to 15-20mph without ever touching the service brakes. Any faster and things get a little sketchy. Between 10-15 is when the exhaust brake disengages, I'm guessing second gear and I have to use the service brakes.

With Eco-hubs installed in the same scenario as above at approximately what speed can I expect the exhaust brakes to stop working with 3.07 gears and 3.90 gears?

 

[GeneralDisorder]

I'll take a video of coming to a stop in my truck. Yes the exhaust brake disengages when you hit 2nd gear because the converter unlocks so the exhaust brake has no effect. But it still works normally and down to about 15-20 mph. You get used to it quickly and it's a non issue. Coming down steep grades it works great and just like a normal civilian truck or bus with "normal" gearing. The slightly higher disengagement speed really isn't an issue and the trade off for +3 mpg and all the other benefits are so worth it that no one yet has cared enough to go back.