Builds BlackBox w/2F/H55/Split Case? (1 Viewer)

[woytovich]

Well you installed the Toybox in your 60, so you know what you are getting into with the complications of a doubler install.
If thats worth 140:1 gearing (5x2.72x2.27x4.55) then it sounds like you have a plan

I did... and I love love love it in the 60

And for the 40... ohhhh baby.... 140:1 sounds like big fun!

Although as I get older I'm CONSIDERING adhering closer to the KISS principle. ("considering" mind you)

 

[pjohnson]

Anti wrap because of the SOA or something to do with the short DS?

SOA and I broke a pinion once.

 

[DangerNoodle]

SOA definitely needs an anti-wrap bar.

 

[EWheeler]

@woytovich You can read up on the Black Box here: Northwest fabworks BLACK BOX - https://forum.ih8mud.com/threads/northwest-fabworks-black-box.1133865/page-5#post-13724664

My reference to those that were unhappy was based on reading @fjdiesel thread, and speaking with @afraptor22 & @Zoverlander . It looks like there is a 2nd gen design that has got some of the issues with the gen 1 units under control.

 

[DangerNoodle]

What are you planning for a cooler, or have they fixed that problem?

 

[woytovich]

What are you planning for a cooler, or have they fixed that problem?

Don't know.
Don't know!

 

[DangerNoodle]

Don't know.
Don't know!

I'd definitely look into that, especially since you said you wanted to keep it as more of a DD. The blackboxes have a pretty good reputation for overheating oil due to their planetary gears and small oil capacity at high speeds (or any time really, as far as I have heard).

 

[White Stripe]

You can get 4:1 split case gears.

 

[John Smith]

How much suspension travel are you planning on having? Sticking with regular 2.5” type SUA or going to more flexy SOA?

If you go with 95-up U-joints/flanges/yokes (same pattern as all 85-up stuff) they have WAY more operating angle then Cruiser joints (like double) so you will have a much more allowance for angle with the short rear driveshaft.

They’re common and cheap too.

Please tell me about these driveshafts... What applications; Land Cruiser, 4 Runner / Tacoma? Do these shafts have a DC Joint on one end?

 

[woytovich]

You can get 4:1 split case gears.

I just hate that those also lower your high range a little. As I intend to drive this on the street a good amount I'd like to keep the benefit of the fifth gear overdrive, such as it is.

 

[woytovich]

I'm playing around with a gear ratio chart. Trying to weigh cost / labor / pain in the ass versus benefits.

 

[woytovich]

Looking at the 3:1 low range gear set... that does not seem to be at all worth it versus the stock low range

 

[cruisermatt]

Please tell me about these driveshafts... What applications; Land Cruiser, 4 Runner / Tacoma? Do these shafts have a DC Joint on one end?

Every Toyota truck/SUV. Yes a lot of the 4Runners have DC’s.
The tricky part is that a lot of the late model stuff has odd tubing and a lot of DS shops won’t touch them.

I run a GX470 front DS as my rear on my wagon, i made my front DS myself by cutting the tubing out of another late-model Toyota DS and re-tubing it with scdh 80 2.5” pipe.

Builds - Cruisermatt's FJ62 Build-up

That's a nice looking front axle. You've really transformed that cruiser into a nice all-around rig. I'm sure it will be lots of fun.

forum.ih8mud.com

 

[woytovich]

For reference, comparing BlackBox to 4:1 SUMO gears to stock...

 

[matzell]

Mark,

I have a H41 Orion 4:1 with 4:10 diffs. I am here on the East coast and run the same trails you do I am sure. I have the same first as your H55f. It works out great and 2nd gear is a good option as well. Anything lower would be stupid for what we do. I have thought about swapping in my H55f and doing a 4:1 split case just to get overdrive. I think you will be happy with it.

Rob