FJ40 3rd on another centered Toyota housing

[Alexr88]

Is there a good write up on how to do a mini (hybrid) axle. I love the idea to use my fj40 3rd member on another Toyota axle housing? I searched but could not find one. Any help would be greatly appreciated. FAQ links not working.

Is this idea cost effective since I can pick up a set of 1 Ton for 1200.00 Dlls?

Purpose: SBC/700r4/NP205/ axle???? (FJ40 Front)

Even building a Toyota Hybrid.
Exploring idea of centered 9 inch from early bronco / bronco II.
What vehicle would make a good donor for this project?

 

[Tigerstripe40]

Is there a good write up on how to do a mini (hybrid) axle. I love the idea to use my fj40 3rd member on another Toyota axle housing? I searched but could not find one. Any help would be greatly appreciated. FAQ links not working.

Is this idea cost effective since I can pick up a set of 1 Ton for 1200.00 Dlls?

Purpose: SBC/700r4/NP205/ axle???? (FJ40 Front)

Even building a Toyota Hybrid.
Exploring idea of centered 9 inch from early bronco / bronco II.
What vehicle would make a good donor for this project?

Personally, I feel that if you are going to go through the effort of swapping in a different rear axle housing, that you should do a significant upgrade, like a full float 35 spline Dana 60 or 35 spline Ford 9"

What have you done to the cruiser axle already?
Have you regeared? Lockers?

There are several vendors (RuffStuff, Diamond Axle, Proffitts) that will sell you a centered rear cruiser third that uses minitruck axle housing, shafts, bearings and brakes. I think the recipe is to cut the ends off of your Cruiser housing and the axle tubes off of an early (pre 86) mini rear housing. The mini axle tubes will slide right into the 'cruser housing tubes with a bit of grinding.

The bearings for the mini truck, I don't feel, are as strong as the 'Cruiser bearings. The axle shafts are the same diameter 30 spline units so the axle shafts themselves aren't an upgrade.

 

[chicago]

Woody did this on his old 40 (raisin).
I tend to agree that its a LOT of effort with no significant upgrade to the axle.
Ive been considering the idea of doing a 14 bolt conversion.
That too is a lot of work and a pretty significant cost to get geared, locked and do the disc brake conversion, but...Id really NEVER have to worry about the axle again.
I had a semi float, cruiser axle let loose coming OUT of the rubicon, BACK ON PAVEMENT!!! That one experience leaves me w/ a certain level of uncertainty EVERY TIME I get back on pavement from wheeling.
That could have killed me and or someone else if it had gone out going at FWY speeds.

Just another option...

I get where youre at though. Its expensive to re gear and lock a different axle, especially considering the fact that you already have one done.

 

[Alexr88]

My axles are stock gears with front disk convertion. I like the gearing but I would love to have it converted to automatic transmission and stronger t-case to hold up with a SBC mild 350. I already replaced one 4 speed, one t-case and 2 broken pinions in a 7 yr period.

I am runing 35" tires with 4.11 gears. I have another option in mind but don't know if this would work.

SBC/700r4/ Adapter?/Dana 300 t-case/ FJ40 stock differentials. (quick fix until I save money to upgrade axles)

Parts already in my garage are engine, tranny, np205 t-case. I can get a Dana 300 for $250 bucks
What do you guys think?

 

[pb4ugo]

I did the mini/40 centered diff a couple of yrs ago. It was pretty easy to do. I purchased the mini truck diff for a $100 & sold its 4.10 3rd for $50. Then I found a pr of extra axles for $40 for spares. I did the swap b/c I already had a detriot & 4:88's in the 3rd member.

Iv'e busted my fair share of offset t/cases, Toy & H**P. IMO, anything you can do to center the rear output is a plus.

 

[chicago]

My axles are stock gears with front disk convertion. I like the gearing but I would love to have it converted to automatic transmission and stronger t-case to hold up with a SBC mild 350. I already replaced one 4 speed, one t-case and 2 broken pinions in a 7 yr period.

I am runing 35" tires with 4.11 gears. I have another option in mind but don't know if this would work.

SBC/700r4/ Adapter?/Dana 300 t-case/ FJ40 stock differentials. (quick fix until I save money to upgrade axles)

Parts already in my garage are engine, tranny, np205 t-case. I can get a Dana 300 for $250 bucks
What do you guys think?

Do you have an ANTI wrap bar in that???

 

[chicago]

My axles are stock gears with front disk convertion. I like the gearing but I would love to have it converted to automatic transmission and stronger t-case to hold up with a SBC mild 350. I already replaced one 4 speed, one t-case and 2 broken pinions in a 7 yr period.

I am runing 35" tires with 4.11 gears. I have another option in mind but don't know if this would work.

SBC/700r4/ Adapter?/Dana 300 t-case/ FJ40 stock differentials. (quick fix until I save money to upgrade axles)

Parts already in my garage are engine, tranny, np205 t-case. I can get a Dana 300 for $250 bucks
What do you guys think?

BTW, that would be a pretty decent set up..
Might wanna do the 203 gear box in front of that for the deeper gearing!
Itll change your LIFE!!

 

[Josie'sLandCruiser]

Hi All:

I 'wheel with a couple guys that still run the old-school "3 speed" t-case with off-set rear TLC axles. One runs a GM 5.3L V-8 (multi-point FI), the other a TBI 5.7L V-8. Both are running 36 inch IROKs with duel locking diffs.

With your current set-up the Land Cruiser rearend will hold-up fine. If your rig is SOA an anti-wrap bar is mandatory for the rear axle. Running 40 year-old coarse-spline third members doesn't help any either!

If you want to do an auto tranny the TH350 or 400 will bolt-up to your SBC and are easy to build for off-road use.

For a stronger t-case that still has an rear off-set the "split" type 'case found in the FJ60 wagon is a great upgrade. The early units (1981 - 84 ? ) on the US market have a low-range of 2.28 and a 34mm idler shaft. The later (1984-87) t-cases have 1.99 low-range gearing and a 38mm idler shaft diameter.

Search here on MUD; lots of good info available!

Good luck with your rig!

Alan


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My axles are stock gears with front disk convertion. I like the gearing but I would love to have it converted to automatic transmission and stronger t-case to hold up with a SBC mild 350. I already replaced one 4 speed, one t-case and 2 broken pinions in a 7 yr period.

I am runing 35" tires with 4.11 gears. I have another option in mind but don't know if this would work.

SBC/700r4/ Adapter?/Dana 300 t-case/ FJ40 stock differentials. (quick fix until I save money to upgrade axles)

Parts already in my garage are engine, tranny, np205 t-case. I can get a Dana 300 for $250 bucks
What do you guys think?

 

[hman913]

I'm going to be using a Dana 300, and for a while wasn't too concerned about the centered output t-case with an offset LC rear housing. I'd just carry a couple extra u-joints for the trail, plus when done the truck will see very little pavement.

However a hybrid LC housing came across my radar a few weeks ago, built by Proffitt's with discs and mini-truck chromo shafts. I could have gone with a 1 ton rear instead, but I want to keep as much LC as possible for the time being.

 

[Alexr88]

If a Dana 300 is used e.g sbc/th400 or 700r4/danna 300 / fj40 rear axel. Would the rear drive shaft be aligned with my rear end?

 

[hman913]

If a Dana 300 is used e.g sbc/th400 or 700r4/danna 300 / fj40 rear axel. Would the rear drive shaft be aligned with my rear end?

Will a D300 be aligned with a stock FJ40 rear end? Nope. The D300 is a centered rear output t-case. If your truck will see any pavement miles you will have driveline vibrations that will shorten the life of driveshaft u-joints, etc. You could always use an Orion to keep the offset rear output, thereby keeping the stock 40 rear end.

Do you ever plan on 1 ton axles?

 

[Alexr88]

Yes. My plans are to eventually move up to 1 ton axles.
I found a set of GM Dana 60 and 14 bold 4.10 gears for 1200. Money is always tight, but if I see that is absolutely necessary to go that route then I will but it will take a while. Thats why I wanted to get a quick fix for now then save for the 1 Ton axles.