Crawl ratio

FJ809496TLC · 12-13-06, 07:12 PM

No rock climbing here in Houston but kinda curious as to what's the most effective ratio for the 80s?

How low can you go?

Imagine a combo of portals, crawl box and 529s

alkaline747trio · 12-13-06, 07:28 PM

I'd like to see gears lower than 5.29s, or a cheaper crawl box; but it looks like I'm gonna have to go portals for that.

D'Animal · 12-13-06, 07:32 PM

I have a 76 FJ40 but I'm at 198:1.
I have the stock 2F, stock 4speed, AA Rock Box and a 3:1 Orion. I have 4:11 in the diffs. I would not go lower. Wierd things break with a tap on the skinny pedal.

FJ809496TLC · 12-13-06, 07:45 PM

Quote:

Originally Posted by alkaline747trio

I'd like to see gears lower than 5.29s, or a cheaper crawl box; but it looks like I'm gonna have to go portals for that.

Like TiredIrons 80?

FJ809496TLC · 12-13-06, 07:48 PM

Quote:

Originally Posted by D'Animal

I have a 76 FJ40 but I'm at 198:1.
I have the stock 2F, stock 4speed, AA Rock Box and a 3:1 Orion. I have 4:11 in the diffs. I would not go lower. Wierd things break with a tap on the skinny pedal.

Are you satisfied with your setup?

alkaline747trio · 12-13-06, 07:50 PM

Quote:

Originally Posted by FJ809496TLC

Like TiredIrons 80?

Yup, and I think I will be there in the next 2 years

FJ809496TLC · 12-13-06, 07:54 PM

Quote:

Originally Posted by alkaline747trio

Yup, and I think I will be there in the next 2 years

That's around the corner.

D'Animal · 12-13-06, 08:13 PM

I'm very satisfied.

FJ809496TLC · 12-13-06, 08:21 PM

Quote:

Originally Posted by D'Animal

I'm very satisfied.

Nay · 12-13-06, 08:29 PM

You don't need those kind of crawl ratios for a large displacement engine, auto tranny rig like an 80. For the kind of wheeling the 80 is suited to do to its large size, a low range reduction (crawler) and 5.29's is all you'd ever need, and even that is overkill if you care about body damage.

You try to get much more extreme than that and the weird things breaking will be stuff like your windshield when you roll it.

DanKunz · 12-14-06, 03:23 AM

Agree Nay...

I crawl just fine. Most people looking to go lower need to get locked first.

ginericLC · 12-14-06, 05:09 AM

Quote:

Originally Posted by Nay

You don't need those kind of crawl ratios for a large displacement engine, auto tranny rig like an 80. For the kind of wheeling the 80 is suited to do to its large size, a low range reduction (crawler) and 5.29's is all you'd ever need, and even that is overkill if you care about body damage.

You try to get much more extreme than that and the weird things breaking will be stuff like your windshield when you roll it.

I disagree. I think that an 80 needs more reduction to help stay in control of the vehicle to keep the windshield from breaking. And I'm not talking crazy numbers. But engine braking could be better maximized if there was a lower gearset available. I think it would have to be a crawler box. In a perfect world I'd like to see like a 1.1:1 high range with a 3.5:1 low range and then you could run stock 4.10s with larger tires.

TiredIronGRB · 12-14-06, 07:07 AM

I'm running 5.99 gearing in the Volvo portals with 40s, on the street I can run 60 mph comfortably and on the trail I crawl pretty good but would like to have better control in rockgardens and such. I've been thinking about putting the other gearing for Volvo portals (7.19) but I'm afraid it will hurt my topend too much.

sleeoffroad · 12-14-06, 07:22 AM

I believe any 80 used for rock crawling can do with a lower ratio than just 5.29's. Nay, I should take you out in the ShortBus. Having crawler gears is so much nicer than having to modulate crawling with the brake while keeping the engine spooled up.

A doubler or a crawler box is ideal since you do not loose your low range, you are just adding low-low. 2nd to that would be a 4:1 ratio in the transfercase. That should work for most people with 35"+ tires.

Nay · 12-14-06, 10:19 AM

Quote:

Originally Posted by sleeoffroad

I believe any 80 used for rock crawling can do with a lower ratio than just 5.29's. Nay, I should take you out in the ShortBus. Having crawler gears is so much nicer than having to modulate crawling with the brake while keeping the engine spooled up.

A doubler or a crawler box is ideal since you do not loose your low range, you are just adding low-low. 2nd to that would be a 4:1 ratio in the transfercase. That should work for most people with 35"+ tires.

I don't disagree at all - I was talking about not needing a crazy crawl ratio such as posted on the 40. When you have squirrels running in the cage mated up to a manual transmission gearing is all you've got, because lockers are going to provide you very little cover.

5.29's and 4:1/crawler would change everything, and then I would be tempted to run severe body damage inducing trails and I'd want 37" tires at least and 7" of lift and then in a year it would be on the classifieds. There are very good reasons to keep things a bit tame and put an extreme crawl ratio in the "nice to have" department

Having said that, when I win the lottery and can buy all of my nice to haves, why not?

Waggoner5 · 12-14-06, 10:22 AM

Its the single best option that I did to my FJ62. I used a Klune and the slow control is awesome. My 45 has a Marks box, and although I am not familiar with wheeling 80s without one, I am pretty sure they would be better with. There are some options coming in the near future for 80 owners. We will post up when they become available.
G

Tapage · 12-14-06, 10:47 AM

All depends of what kind of rocks we are talking about .. I thought in more situations is more wanted lockers than extreme gearing ..

Don't get me wrong .. yap proper gearing it's a must, but more than 100:1 RC ! yap you you have you can use .. but if not . ?

Nay · 12-14-06, 04:24 PM

Quote:

Originally Posted by Waggoner5

Its the single best option that I did to my FJ62. I used a Klune and the slow control is awesome. My 45 has a Marks box, and although I am not familiar with wheeling 80s without one, I am pretty sure they would be better with. There are some options coming in the near future for 80 owners. We will post up when they become available.
G

Oh, do tell what options are coming up!

Has somebody solved the fabled 4:1 t-case reduction quandry?

A crawler with no chassis or gas tank mods?

Solutions for under $3K

RavenTai · 12-14-06, 04:51 PM

Quote:

Originally Posted by ginericfj80

I disagree. I think that an 80 needs more reduction to help stay in control of the vehicle to keep the windshield from breaking. And I'm not talking crazy numbers. But engine braking could be better maximized if there was a lower gearset available.

I was putting arround at a construction site the other day, it did not seam that there was any engine braking at all at idle wile in low on my A343, stall range of the converter? seams like doing a manual switched torque converter lock would more effective than gearing for compression braking. maybe tie it to the brake switch so it kicks out when you tap the brakes so you can stop without stalling. then reengage it after you get going again, could be very jarring otherwise.

alkaline747trio · 12-14-06, 07:51 PM

Quote:

Originally Posted by RavenTai

I was putting arround at a construction site the other day, it did not seam that there was any engine braking at all at idle wile in low on my A343, stall range of the converter? seams like doing a manual switched torque converter lock would more effective than gearing for compression braking. maybe tie it to the brake switch so it kicks out when you tap the brakes so you can stop without stalling. then reengage it after you get going again, could be very jarring otherwise.

Would be great!! 3.5:1 w/ manual lockup TC