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

[hole]

Started off all stock drivetrain (4x2.62x2.73=28.6 and that sucked off road, way to fast for me. Now, after some modifications (5x4x2.73=54.6) things are getting better. Still running 2.73's now sucks loaded down on road, but I'm saving up to change that as well and should be around 80 when I'm done.

 

[Peanut Butter]

My crawl ratio is not very good on paper - 4.56 r&p x 2.62 x 2.48 1st gear = 29.63, but my Transmission is a GM Turbo 400 auto behind a 401 v8, and it creeps up stuff pretty well with very little drama on 35x12.50's because of the "torque multiplying", or slippage or whatever you want to call it effect of the torque convertor. It basically behaves like a manual Transmission rig with about a 50/60:1 ratio. Just point it up the hill, bring the revs up to about 12-1500 and it goes right over stuff, no fuss. My carb is a Sean Murphy Q-jet and it will run smoothly at pretty stupid angles, and this rig is super easy to drive compared to a manual, its kinda like cheating.

I think this is where everyone chimes in with "Real men drive manual Transmission jeeps" or some such.

Dave

<<Hope you have a good-sized tranny cooler with fan in place.
LG>>

I do have a fairly large Derale Stacked plate style cooler with 2 hi output fans mounted underneath the bed, right in front of the fuel tank. The fans are controlled by a themostatic switch mounted in the Transmission oil pan. Thermo switch is closed @ 180 deg, open @ 165 deg. The fans cycle on and off during the course of operation so I assume they are getting the job done, otherwise would run continuous.

Also have a large aggressive 7 blade 19" fan from an early Cadillac I believe, mounted on a heavy duty fan clutch with a tightly fitted fan shroud for the motor. Highest temp seen on the engine so far is about 210 with a 180 tstat, hot day heavy load. I know 401's run hot so that's why I separated the Transmission cooling and engine cooling. The Transmission seems to build more heat running down the highway at 60 mph than it does crawling up a hill for an hour. Go figure.

Dave

:rock:
Good to hear this-Many folks don't understand that a by-product of an auto-Transmission , is lots of heat. Heat will kill an auto in a very short time.
If you ever feel the want in posting pictures of your set up with the coolers et-all. I would love to see them.
LG

I would really like to see some of those pictures too! What type of adapter did you use for the GM Turbo 400 to the Dana 300 ? I'm going with my stock I6, GM Turbo 400 , QT for now, but would like to see more of your setup. Thanks

 

[WHATROAD]

I decided to revisit this thread. At the time it was an area that I really hadn't ever considered. In fairness, I never thought off taking my cj vertical before either. I have taken the idea to heart and it has guided many of my upgrades since. The last application was to put in 4.56 gears. I now have a crawl ratio of around 48. Not a vertical climber, but I've been in all of those that I want to. The T-5 is now the week link, for most thoughts, but I like the fifth gear on the highway. Actually, anytime above 45. Currently saving every Lincoln for a rebuild on the AMC 258 i6 / 4.2l . After nursing an engine with blow by for two years it's time. Peace!

 

[Belizean]

I'm not sure what mine is but I'm looking forward to see and feel the difference in my new Lomax 4:1 gears once I get it all back going again.

 

[hole]

The difference is night and day!

 

[JR74CJ5]

Love the revived thread - cool to read updates from some.

I still have yet to get my Dana 300 or Terra Low Gears. lol Still plain old 60:1 ish

 

[WHATROAD]

Nothing plain or old with a 60.1 ish. From most all of the publications and opinions out there, that I read, 50 is a good number to be around for most of our four wheel needs and still go down the highway. 100 and up for the rock crawler guys. With all the numbers either side. I chose to be near 50 because the old thing is still my dd

 

[JR74CJ5]

Nothing plain or old with a 60.1 ish.

Lol - true, but I like to pretend I'm a rock crawler on 33's!

 

[Belizean]

Well if I calculated correctly I'm at 50.

 

[Patrick]

My numbers are as follows:

Axle gearing 4.27 X first gear 4.01 X Transfer Case 2.62 = 44.86 overall ratio

No rock crawler, just the occasional offroad fun for my rig never having to use 4 low. Plenty for me.

 

[WHATROAD]

Thanks' for sharing! I find it interesting how many different combinations come up on a vehicle that was fairly similar off the showroom floor. Also, how changing one thing can deliver a different ratio.

 

[Belizean]

The difference is night and day!

Just calculated without the new Lomax and it is substantial

 

[RiverandSand]

Never thought of the crawl number, not much of a crawler guy.
Here are mine; gear 3.54 x 1st 6.55 x TC 2.62 = 60.7

 

[Belizean]

Never thought of the crawl number, not much of a crawler guy.
Here are mine; gear 3.54 x 1st 6.55 x TC 2.62 = 60.7

I think with that 1st you are pretty much a crawler unless you never use it !

 

[RiverandSand]

Yep, it's pretty much useless on the street, start out in second, so basically it's a 3 spd. If you need it, it's not synchronized, so you must stop.

 

[73AMC360]

81.36 to 1 in first low --I can still do 70 on the freeway. 65 is comfortable.

35" Swampers 4/10 rear 3.15 Tera low in a Dana 20 T-18 6.62 in first. Thats about 1 1/2 feet per second at 1000 rpm

 

[RangerRick]

5.72:1 1st X 4.0 Lo X 4.10 Axle = 94:1 (93.808) with the Lo-Max gears in the Dana 300
5.72:1 1st X 2.62 Lo X 4.10 Axle = 61.5:1 (61.44424) without the Lo-Max gears in the Dana 300
Drivetrain: 320Lb. Ft Cummins 4BT, ZF s5-42 O.D. 5-spd, 4.10 gearing Dana 44 /FS8.8, 35" ProComp M/T2's

RR

 

[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

Wow 2016 was my first reply to this thread, I can now report that after being on the road for almost 2 years now that 4 low is awesome on snow, I can only go around 15 mph in 5th gear but whatever LOL, I do cruse the highway around 60-70 comfortably as well


Sent from my iPhone using Tapatalk

 

[MattJ]

My numbers are as follows:

Axle gearing 4.27 X first gear 4.01 X Transfer Case 2.62 = 44.86 overall ratio

No rock crawler, just the occasional offroad fun for my rig never having to use 4 low. Plenty for me.

My uncle is looking to get this CJ project and he's planning to go for occasional offroad. We'll start working on it after we finished installing the mud tires and wheels plus winch on the Ram project this week and clear the garage. He'll surely consider that setup.

 

[Patrick]

4.27 axle gear ratio is exclusive of Dana Spicer, and the Ford 9” comes close to it. It is the ideal ratio for 33” tires and is not very common to see. It is a very well kept secret. Thanks for quoting, MattJ.