Updating the "Sand Box" - Page 2

FISHBREATH · 10-10-2008, 12:13 PM

I was wondering what RPM you are running at 65mph with your 4.11 gear ratio????

I agree that most of these vans could stay with 4.11 or my preferance would be 3.73 even with the larger tires. How many people are rock crawling with these rigs anyway.

FB

adventureduo · 10-10-2008, 12:49 PM

I wanna say 1900-2100. I will double check though.

jage · 10-10-2008, 08:28 PM

Quote:

Originally Posted by FISHBREATH

How many people are rock crawling with these rigs anyway.

It's not about rock crawling, it's about going slow and slower in low range. You have more control going up, down, over or through anything the slower you are going. With how heavy these are that makes a big difference.

You might not think that you need to go lower than the Atlas, but going on a simple trail in low with 4.11s and 33s I've "bounced" the van over to about 30Âº just going in a large set of ruts that started unevenly. I was pretty sure the van would be renamed tippy after we pulled it off the tree, but luckily it didn't go over.

Even so the auto effectively doubles (or so I've heard) your crawl ratio (in terms of "rock crawling") because of the torque convertor, and you may well experience better gas mileage as a result of higher gears. My Jeep currently has 3.73s and 35s and I'm getting as good of gas mileage as stock... well that is when springing for premium.

FISHBREATH · 10-10-2008, 10:04 PM

Quote:

Originally Posted by jage

Quote:

Originally Posted by FISHBREATH

How many people are rock crawling with these rigs anyway.

It's not about rock crawling, it's about going slow and slower in low range. You have more control going up, down, over or through anything the slower you are going. With how heavy these are that makes a big difference.

You might not think that you need to go lower than the Atlas, but going on a simple trail in low with 4.11s and 33s I've "bounced" the van over to about 30Âº just going in a large set of ruts that started unevenly. I was pretty sure the van would be renamed tippy after we pulled it off the tree, but luckily it didn't go over.

Even so the auto effectively doubles (or so I've heard) your crawl ratio (in terms of "rock crawling") because of the torque convertor, and you may well experience better gas mileage as a result of higher gears. My Jeep currently has 3.73s and 35s and I'm getting as good of gas mileage as stock... well that is when springing for premium.

I would agree that going slow is important and it's not about rock crawling if it was we would all be running even lower gears. I see on the sportsmobile website there is an option for lower gearing in the transfercase, for me that would be the best option, as stated somewhere else in the forum it all depends on your use. I would like to get better mileage and one of the ways to get there is with optimum gearing. there are many variables to this whole equation.
I have been thinking lately that maybe my transmission has lasted this long (145K) becauze I am running 4.10 gearing and the trans does not have to work as hard, maybe one advantage to the lower gearing. (not sure of this trany theory)

At this point I would agree to disagree.....

FB

Are they 4.10's or 4.11's????

FB

myriadmyriad · 10-10-2008, 10:19 PM

The ratio is 410. I think 3.73 are a little tall with 33s or 35s.
Going up hill in a head wind lugs the 3.73s
I put the lower gears in the transfer case (3.8)
As always, this just my opinion.

Jeff

adventureduo · 10-11-2008, 09:49 AM

Part two of the update is complete. No more saggy butt.

FISHBREATH · 10-11-2008, 12:30 PM

Hey no more saggy butt........

Did you just add larger spacers???

FB

adventureduo · 10-11-2008, 12:41 PM

Quote:

Originally Posted by FISHBREATH

Hey no more saggy butt........

Did you just add larger spacers???

FB

Yeah, for this trip. It's just temporary. I hate blocks and they are not the correct way of lifting the vehicle. That being said, we are only running it for 2 months like this until we can get the new springs in. I do not recommend running lift blocks. Once again this is just temporary.