FZJ-80 Crawl box options (1 Viewer)

[themainjam]

so i was spoiled with my 4runner and dual cases with 4.7s in the rear. i just sold that and got a green light for modifying our family land cruiser. i am researching the build and realized there isnt as much tech on the 80's.

so what are the most common transfercase mods for lower gears? i found a crawl box from gearmaster but :yikes: 3800 later.... not really feasible.. the truck is only worth twice that hah!

it has the automatic.

i am planning on a slee offroad lift with 37's and some longfields steering reinforcement... and still researching.

any other weak points? i am pretty easy on the trails with my trucks 1 stock birfield in many offroad encounters.

 

[silverhorse]

I'm not up on these full time cases either but I have read where people have installed lower gears. Maybe from Marks 4wd Adaptors Home Page ?

 

[OGBeno]

The lower gear set requires modification to the xfer case to make them work (grinding the inside of the housing). Also, this only lowers the lower end and does nothing to the high range which would be ideal.

 

[Novae]

The lower gear set requires modification to the xfer case to make them work (grinding the inside of the housing). Also, this only lowers the lower end and does nothing to the high range which would be ideal.

Isn't that what reduction gears usually do? I had always thought that their point as opposed to changing diff gearing was to only change the low range gearing.

 

[pr0ject42]

You can get some t-case gears from iron pig that will lower your high range as well. It isn't much, certainly not enough to offset 37s.

Mark's crawl box is the only crawler I've heard of for the 80. I talked with Dave at Marlin about 6-9 months ago about a toybox possibility and he seemed positive, but I really wouldn't hold my breath.

They seemed to be leaning more towards developing t-case gears first as well, just to reduce the setup cost for the product. Understandable.

Just try wheeling it with the slushbox, you might be surprised at how much you don't need a crawler with the auto.

Keep in mind that with any crawl box on the 80, you are most likely going to have to cut up the trans tunnel under the arm rest and modify the gas tank.

Wrench on here has a marks crawl box, send him a PM with questions about it, he was great about answering my questions.

 

[themainjam]

Cool thanks guys I think I might need a new torque converter because even in low it just revs but doesn't tend to have much power.

 

[alkaline747trio]

You can get some t-case gears from iron pig that will lower your high range as well. It isn't much, certainly not enough to offset 37s.

Is that right? Hmm...I remembered seeing a set at one time that lowered both Low and High range but had since been unable to find it. If Iron Pig has them that would be awesome. With my 3FE and the 37-40" tires I run 5.29s aren't enough. 5.71s would be ideal (but cost strength), maybe this will get me in the sweet spot of the 3FE again.

 

[pr0ject42]

Call them, I'm pretty sure it isn't on their website, but I'm too lazy to check.

It isn't much, puts you up from a 4.10 (at stock) to 4.50. I don't know if it would work for the 3FE t-case, but heck there might already be gears out there for that case. Give them a call, you never know until you do.

 

[Nay]

I'd suggest 5.29's and the case gears. Add to that a factory hand throttle (many people don't realize what an auto transmission and hand throttle can do) and you'll be able to do the stuff an 80 is well suited to do without damage. If this is in fact the family crawler, i.e. you will still use it for family transportation, there is some serious value in not having too much capability in terms of limiting body damage.

Having said that, this big pig would love serious low gears, but realistically I think at that point you are talking about replacement axles, too, and now you are dropping over $10K to probably run the same trails you could run anyway without that much difficulty.

My personal view is that an 80 is a different beast - there is just not that much you can do to change it's most basic limitations and the idea is to maximize the underlying platform. The right lift and 37's, some light armor, 5.29's and it will drive you cross country and wheel almost anything in between.

Mark's box if your gonna do it....

 

[fzjconvert]

Call them, I'm pretty sure it isn't on their website, but I'm too lazy to check.

It isn't much, puts you up from a 4.10 (at stock) to 4.50. I don't know if it would work for the 3FE t-case, but heck there might already be gears out there for that case. Give them a call, you never know until you do.

Yeah, I checked, they are not on there web page...

 

[4WD Toyota Owner Magazine]

Nay--totally agree with you. Your last sentence is spot on.

I'd suggest 5.29's and the case gears. Add to that a factory hand throttle (many people don't realize what an auto transmission and hand throttle can do) and you'll be able to do the stuff an 80 is well suited to do without damage. If this is in fact the family crawler, i.e. you will still use it for family transportation, there is some serious value in not having too much capability in terms of limiting body damage.

Having said that, this big pig would love serious low gears, but realistically I think at that point you are talking about replacement axles, too, and now you are dropping over $10K to probably run the same trails you could run anyway without that much difficulty.

My personal view is that an 80 is a different beast - there is just not that much you can do to change it's most basic limitations and the idea is to maximize the underlying platform. The right lift and 37's, some light armor, 5.29's and it will drive you cross country and wheel almost anything in between.

 

[dtrain]

I'd suggest 5.29's and the case gears.

Nay - thanks for the info. Are the gears you referenced ablove the IPOR gears?

Also, do you know if thats a or a job?

 

[OGBeno]

IIRC, IPOR does not have their own proprietary gears/box for the 80. I think that was a one-off that Lance and Cam worked on....

They might have even been the Mark's gears. I'd give Lance a buzz at IPOR and discuss personally with him. He's got a good mind on this stuff.

-o-

 

[Dusty]

I have been beating on my marks 3.1 gearset for a couple years now-without much mercy i might add. they are holding up great. i little bit of work to do the install but worth it

only gives you about 25% lower gearing in low range. But at about $1000 for the gears the price is similar to a regear (unless you can do R&P yourself)

 

[dtrain]

Beno & Dusty... thank for the info!

 

[notthejeepnomo]

Theoretically speaking.

I haven't done this, but from what ive read this might be a complicated option and is based soley on internet researching while at work but here goes, and please correct me if i'm wrong. The a343 has a removable bell housing so one could possibly bolt up an A340f tranny from a tundra/tacoma and then mount up one of marlin crawlers cases behind that. behind the marlin case some have been able to slighly remove some material from a 60 series split case to mate it to the marlin case. the split case would give the correct offset. I haven't called marlin crawler to confirm as this has been weekend work research.
Someone tell me if this would work.
peyton

 

[Ebag333]

Wouldn't you have to weld the existing holes in the bell housing and drill new ones in to mate it up? I guess the question is if it'd even line up close enough to make that work.

Interesting idea....

 

[lt1fire]

This has been hashed over for years now.

The only gears sets i've seen are Marks and Rock Hopper gears from OZ. The latter now no longer being reproduced. For the $1000 for the Marks it doesn't seem worth it to me.

The only crawl box is also from Marks and runs aroudn $3000. To do this you have to chop a hole in the floor and raise it up an inch, do a body lift, and chop and re-seal the gas tank.


The ones that are referenced from IPOR I believe were a one off as were a few from Marlin that I heard were floating around.

 

[notthejeepnomo]

ebag333: As to the bell housing, according to what "they" say the A3xx series transmissions bell housings have differing bolt patters on the engine side but the bolt patterns on the tranny side are the same.

So tranny swap options for the 1fz with the a343f bellhousing would be the A341E out of an ls400, A340f out of a tundra/4runner, and A340e out of a number of cars or trucks. I mentioned the A340f in the previous post, because there is all ready an adapter to mate the marlin crawl box behind it.

Keep in mind this is what "they" say.