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.