Just curious to know.. What's everyone's crawl ratios?

[jakeh937]

Going to be ordering parts and wondering what's everyone's crawl ratio. What's to much? What's about right? What's not quite enough? Thanks!


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[WHATROAD]

As a retired commercial pilot you would think that working that math problem would make me giddy...... no, not so much. You will be able to find those answers through your favorite search engine definitely. I'm not trying to challenge your question, just sayin, personally, I don't think I've ever thought about that value. You can bet I will look it up though.

 

[jakeh937]

As a retired commercial pilot you would think that working that math problem would make me giddy...... no, not so much. You will be able to find those answers through your favorite search engine definitely. I'm not trying to challenge your question, just sayin, personally, I don't think I've ever thought about that value. You can bet I will look it up though.

Iv done some research on it and from what iv came up with for a manual Transmission anything around 45-60 is pretty good. But I'm not to sure if the lower end will be good or if most guys run them higher.


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[WHATROAD]

I understand more clearly now. If I read this correctly, application of the correct parts and gearing will deliver the crawl ratio you desire. Some believe tire size effects this value as others do not. Good luck brother! I guess I'm stuck with my stock answer on this one. I just fly em

 

[jakeh937]

I understand more clearly now. If I read this correctly, application of the correct parts and gearing will deliver the crawl ratio you desire. Some believe tire size effects this value as others do not. Good luck brother! I guess I'm stuck with my stock answer on this one. I just fly em

Hahaha thanks my man. It's a tough one for me to figure out!


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[gert]

NV4500 Transmission with 6.34 first gear Dana 300 Transfer Case with 4 to 1 gear Dana 44 front / Dodge 9.25 rear with 3.91 gears Goodyear DuraTracs 315/60R17 makes 99 to 1....... deeper than I wanted I was looking for the later NV4500 with the 5.61 first gear that would give me an 80 to 1 crawl ratio. Im still building this beast and should be done by next July to make the Colorado trip and it should be able to crawl straight up a mountain

 

[gert]

I understand more clearly now. If I read this correctly, application of the correct parts and gearing will deliver the crawl ratio you desire. Some believe tire size effects this value as others do not. Good luck brother! I guess I'm stuck with my stock answer on this one. I just fly em

T-5 first gear 4.03, Dana 300 low gear 2.62, axle gear ratio 3.31, tire diameter 33 = 36.4 crawl ratio

4Lo.com :: Final Gear Ratio, Crawl Ratio, Tire Size Calculators

 

[WHATROAD]

hahahaha, Thanks brother, you can officially put three stripes on your shoulder epaulets. It is a worth knowing. The set up I have does lend itself more to the DD application I use it for than crawling up a tree but I guess that goes without saying. Always great info to be found on this sight!

 

[jakeh937]

NV4500 Transmission with 6.34 first gear Dana 300 Transfer Case with 4 to 1 gear Dana 44 front / Dodge 9.25 rear with 3.91 gears Goodyear DuraTracs 315/60R17 makes 99 to 1....... deeper than I wanted I was looking for the later NV4500 with the 5.61 first gear that would give me an 80 to 1 crawl ratio. Im still building this beast and should be done by next July to make the Colorado trip and it should be able to crawl straight up a mountain

See I like the 70-80 idea. How's something like 45ish going to do? Will I be able to climb?


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[gert]

hahahaha, Thanks brother, you can officially put three stripes on your shoulder epaulets. It is a worth knowing. The set up I have does lend itself more to the DD application I use it for than crawling up a tree but I guess that goes without saying. Always great info to be found on this sight!

short of converting to fuel injection and 1 piece axles you have a wonderful DD mild wheeling combo

 

[gert]

See I like the 70-80 idea. How's something like 45ish going to do? Will I be able to climb?


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I think you should be able to. maybe not the best crawler. Maybe in the future look into the Tera Low kit for your T case to drop your crawl ratio lower.

 

[jakeh937]

I think you should be able to. maybe not the best crawler. Maybe in the future look into the Tera Low kit for your T case to drop your crawl ratio lower.

I think I'll be ok as well. I'm thinking swapping out gears to 4.10 with 33" tires, running 6.68 Transmission gear in granny low. I figure itl allow me to crawl, nothing extreme, but still get up and go on the road. However, I do like the thought of being able to climb whatever I see [emoji41]


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[jakeh937]

I think I'll be ok as well. I'm thinking swapping out gears to 4.10 with 33" tires, running 6.68 Transmission gear in granny low. I figure itl allow me to crawl, nothing extreme, but still get up and go on the road. However, I do like the thought of being able to climb whatever I see [emoji41]


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Or 4.56 gears. Still unsure.


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[hagar]

92.6

 

[WHATROAD]

Okay guys, you have sent me delving into the world of all things related to crawl ratio theory. Currently on the Novak guide after reading an article from trukyeah. I have found a, before tonight, subject that I didn't know about. I am kinda of a technical geek. Pilot thing I guess. So this is quite interesting.

The subject matter does lend itself more to those with a substantially larger budget to spend on their jeeps than I have. But I get it. Thanks for bringing this into the discussion.

 

[HackFabrication]

90.78 in 1st, Transfer Case in low (T18a/Dana 20 -3.15 TerraLow/4.56 gears)

106.87 in reverse, Transfer Case in low.

A better number to look at is what your Feet Per Minute is. With the above combo, at 1000 rpms, it's 92 FPM (assuming a true 32" tire). Probably less when aired down. Lower FPM will keep you from having to use the clutch a lot, assuming you've got the engine power to keep the wheels turning at the lower rpms.

Above numbers calculated using: Gear Ratio Calculator

 

[gert]

Or 4.56 gears. Still unsure.


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I do not know what your plans with your Jeep are but I want to be able to do as much as possible with mine and I selected my 5 speed Transmission gears and tires based on wanting to drive on the highway and still be fairly capable off road.

The lower you go on your gear set the harder you push your motor on the road. That is why I suggested the Tera Low set for your Transfer Case . That will probably be cheaper to do than swapping ring and pinions

 

[CJ]

Figured Id soften up this thread with a bit of humor,

Im doing the WATERMELLON CRAWL!

 

[Posi]

Going to be ordering parts and wondering what's everyone's crawl ratio. What's to much? What's about right? What's not quite enough? Thanks!
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All depends on your wheeling terrain, and how you intend to use your rig.

79 CJ5 .5 = 133.1
77 CJ5 = 82.1
69 CJ5 = 37.1 stock
79 CJ5 = 21.1 stock

In Silverton CO I was good with 37.1, in the northeast not so much.

 

[gert]

All depends on your wheeling terrain, and how you intend to use your rig.

79 CJ5 .5 = 133.1
77 CJ5 = 82.1
69 CJ5 = 37.1 stock
79 CJ5 = 21.1 stock

In Silverton CO I was good with 37.1, in the northeast not so much.

Holy smokes how's the 133.1 working out?


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