Lower transfer case gear ratio

[maxdog1969]

While out wheeling yesterday descending a moderate to steep hill while pulling my Offroad trailer, I had ti modulate the brakes to control down hill speed, I was in 4L and first gear, don't feel like the transfer case gear is low enough for my comfort, is there a lower gear transfer case solution for the 100? I am running 33" tires with stock RP.

Coming from a Rubicon I was so used to the 4:1 transfer case and I miss having the controllable crawling speed.

Any thoughts?

 

[spressomon]

I've got a set of Marlin's low range gears sitting in my garage waiting to be installed...hopefully in the next couple of weeks. Got it from Slee.

http://www.marlincrawler.com/transfer-case/line-ups/single/fj80-crawler-gears

 

[maxdog1969]

What will be your final craw ratio after the install?

Thanks for your inputs

 

[arbetrader]

Those look like 80 series gears, unless I'm seeing this wrong...

 

[hoser]

Similar t-case.

 

[maxdog1969]

My final crawl ration stock configuration is about 30:1

The Marlin set up will increase it by 25% I am assuming the new final craw ratio will be around 37:1

Costs for the new gears about $1000

How much time would it take an experienced Land Cruiser mechanic to swap the gears?

Trying to figure out the budget.

 

[Romer]

you might want to look at changing the gears in the diffs instead of the tcase. it will give better enginer braking/crawl going down hill

 

[jonharis]

I've got a set of Marlin's low range gears sitting in my garage waiting to be installed...hopefully in the next couple of weeks. Got it from Slee.

http://www.marlincrawler.com/transfer-case/line-ups/single/fj80-crawler-gears

Popcorn!

 

[maxdog1969]

Romer,

I am running 33" tires with the stock 4.30 RP, unless I go to 35" then I will definitely do 4.88

 

[spressomon]

Ali recently installed the same gears (...they're actually Marks but from a gear reduction perspective they're the same IIRC) on his 80 and he's pretty darn excited about it.

They're both 343 t-cases...just the difference of the CD AFAIK.

Maybe Christo will chime in as I believe they've already installed a set on a 100's 343...

 

[maxdog1969]

I will place a call to Marlin tomorrow

 

[sleeoffroad]

We have not done the Marlin gears in a 100, but we did a Mark Adapters set into a 100. Pretty much the same thing. As for time 2-3 hours R&R transfer case. Couple of hours to take case apart and install gears.

 

[Layonnn]

you might want to look at changing the gears in the diffs instead of the tcase. it will give better enginer braking/crawl going down hill

Just doing some research on this subject and saw this post.

The 98-02 with a 2.804 first gear has a crawl ratio of 30:1
With 4.88 diff gears instead of stock 4.3 you have a crawl ratio of 34:1
With the 3.116 transfer case gear instead of stock 2.488 (with stock 4.3 diff gears) you have a crawl ratio of 37.5:1
With 4.88s and 3.116 gear you get 42.6:1!
So installing the transfer case gears would give you a better crawl ratio and engine braking over installing diff gears, also far less expensive.

03-07s have 4.1 diff gears but a 3.520 first transmission gear and has a stock crawl ratio of 35.9:1
With 4.88 gears, 42.7:1
With 3.116 transfer case gears, 45:1.
With 3.116 and 4.88s you get 53.6:1!

So in both cases you would achieve a lower crawl ratio with the transfer case gear replacement vs diff gear replacement. The transfer case gears look like they are on sale right now for 800 and they look to be installable by most weekend wrenchers. But even if you had a shop do it the labor looks to be a few hours. If you have diff gears installed, labor alone will run you about 1000-1500. So about 2000-2500 including parts.

However, the diff gears give you a lower gearing all the time, where as the transfer case gears only come into effect when in 4LO.