stupid question

[mhughes165]

how exactly do u calculate a crawl ratio???

 

[BLOODBANE]

This is from the Wild Horses website......
How low can you go? Take the lowest gear in your transmission and multiply that by the low gear in your t-case and then by your ring and pinion gear.

Example 1: NP 435 first gear is 6.69 x 2.34 in your T-case x 4.11 ring and pinion = 64.34 which we would call 64 to 1. Not bad.

Example 2: Now let's throw in a Dual T-case. NP 435 first gear is 6.69 x 2 in your Super Crawler x 2.34 in your T-case x 4.11 ring and pinion = 128.68 or 128 to 1.

 

[colinrmitchell]

(Transmission First Gear) x (T-case 4-LO gear) x (Axle Gear)

If there's a doubler, also mulitply by the doubler's gear.

I.e.,

Transmission: 3.25
Doubler: 2.48
T-Case: 2.48
Axle: 5.13

3.25 x 2.48 x 2.48 x 5.13 = 102.54 final crawl ratio.

 

[mhughes165]

so, for me, it will be 6.69x2.34x4.56(if i regear the rears to 4.56)=71.38

 

[mhughes165]

but right now without regearin my crawl ratio would be 56 to 1, would that be pretty decent for the ocassional rocky trail(i normally dont do rocks)

 

[Will]

Well, crawl ratio has never been my problem in dealing with rocks. I don't think it's your first problem. Ground clearance is the first problem. I usually get hung up. Big tires and a low CG so you don't tip over and flex to keep the weight and traction distributed, and of course lockers. I would put a crazy crawl ratio last on the list.

One of the best pickup trucks I've seen in action is redriverrangers. He has 38s and D60/9" full-width. For power he has a 4.0, C5, 13-54, 4.88 axles I think. That's it. That's a measly 30:1 crawl ratio, but that's not what you are thinking about when you see that thing in action. He's made it up the center of Purgatory at Attica with it.

 

[Jorley]

http://www.therangerstation.com/tech_library/Crawl_Ratio.html

 

[mhughes165]

http://www.therangerstation.com/tech_library/Crawl_Ratio.html

well, that much has been answered, im just lookin to see if ym crawl ratio would be suitable for the occasionaly rocky trail

 

[Todd]

56:1 should be fine for all around wheelin. Many of my buddys are around that.