Baby Beast Evolution

[Uncle Ben]

Thanks man! Yeah, the knuckles really are awesome. They were totally worth the wait. I just hope the company can stay in buisiness, because I think FJ80 outters are going to become the new standard in rock crawing with toyota running gear.

The bells are very close to D60 bells on the RCI CV conversion shafts for steering Dana 60's. I'd be curious to see Bobby Long put both a set of his 80 series longs and a Set of RCI D60 bells to the test on his axle breaking machine.

The 80 Birfs are the strongest possible choice for Toyota based stuff but D60's still use 35 spline axles. 1.10" 30 spline cannot compete with 1.38" 35 spline or 1.63" 40 spine stuff!

Example....

1.10 (30 spline) material and yield strength.

1040 Carbon Steel (stock) 2,313 lbs/ft2
1050 Carbon 3,185
1541H Carbon 3,578
4340 Alloy (chromo) 4,582

1.38 (35 spline)

1040 4,557
1050 6,277
1541H 7,051
4340 9,029



That extra 1/4" nearly doubles the yield strength of the axle. So in short yes, you can get the CV joint close to the same strength but the axle will always be the weakest link due to size available.

 

[AxleIke]

Which is why I said "with toyota running gear"

AFAIK, no one is making 35 spline stuff for the front of a toyota, even in the nether-worlds of genious fabricators needing stronger and stronger stuff.

Most guys rock crawling on toyota stuff have super light buggies with 22re's or the new 2.7's. Toy transfers don't hold up well to big tires and any more power than that. So 30 splines with 9.5's in the diffs with 80 bells would make a beefy drivetrain for a lightweight buggy w/out tons of horse power.

Lots cheaper too!

The 80 Birfs are the strongest possible choice for Toyota based stuff but D60's still use 35 spline axles. 1.10" 30 spline cannot compete with 1.38" 35 spline or 1.63" 40 spine stuff!

Example....

1.10 (30 spline) material and yield strength.

1040 Carbon Steel (stock) 2,313 lbs/ft2
1050 Carbon 3,185
1541H Carbon 3,578
4340 Alloy (chromo) 4,582

1.38 (35 spline)

1040 4,557
1050 6,277
1541H 7,051
4340 9,029



That extra 1/4" nearly doubles the yield strength of the axle. So in short yes, you can get the CV joint close to the same strength but the axle will always be the weakest link due to size available.

 

[Uncle Ben]

Which is why I said "with toyota running gear"

AFAIK, no one is making 35 spline stuff for the front of a toyota, even in the nether-worlds of genious fabricators needing stronger and stronger stuff.

Most guys rock crawling on toyota stuff have super light buggies with 22re's or the new 2.7's. Toy transfers don't hold up well to big tires and any more power than that. So 30 splines with 9.5's in the diffs with 80 bells would make a beefy drivetrain for a lightweight buggy w/out tons of horse power.

Lots cheaper too!

No dispute! If you do the math, nothing should be able to withstand the torque multiplication that you mini truck guys are subjecting your drive-trains to! Im singleing out mini truck guys specifically due to your insane gearing. Wanna scare your wallet? Start multiplying your torque out! Dont forget to add in the 25 or higher percent for big tires as that directly affects the torque your axles are expected to operate! In a perfect world with 100 persent traction and 0 tire slippage 5 ton Rockwells would be challenged to those torque numbers! Love this stuff!

 

[AxleIke]

Well, true, though there is a bit of torque lost through the inertia of all those gears, so you don't entirely get the straight through multiplication.

Its still a lot, but the other factors are: size of your tires, sprung and unsprung weight, and your driving style.

A stock 22re has like, what 80-100 ft lbs of torque at the flywheel, maybe?

Say 100 for ease of calculation. With no losses to inertia, the multiplication to the wheels is 20600 something foot lbs on a dual cased 4.88 geared truck with W56.

I never broke a 7.5" diff, or a CV axle with that set up, but, I KNEW that my axles and diffs had some weaknesses, and I drove accordingly.

That's why I think this will all work pretty well for me. I know how I drive, so I'm building a rig that fits that, and my budget.

But yeah, I'm with you. 40 spline stuff would be SUWHEET.

Then the build becomes too much a buggy, and loses too much of its roots. I may be a fool for pretending, but I like to think I'm keeping this truck's toyota roots while fixing some of the less appealing parts.

Maybe not.

Although, I must admit, I was trolling around for a 73 series today. Too bad they are all way, way out of my price range, and RHD.

 

[Rezarf]

Wow, that is some good looking hardware! Those things just scream tough! Are you going to be going with a hydro setup?

Starting to look close... maybe its just seeing a wheel and fender on it, but what are the major steps before getting it out on the road/trail again?

Drew

 

[AxleIke]

Wow, that is some good looking hardware! Those things just scream tough! Are you going to be going with a hydro setup?

Starting to look close... maybe its just seeing a wheel and fender on it, but what are the major steps before getting it out on the road/trail again?

Drew

Whooo boy, lets see...

Finish the front suspension links
get coilovers/engine cross bar made
figure out spring rates
figure out shock valving
figure out steering box
build engine mounts
build front clip
finish transmission and transfercase mounts
get my rear housing from Ruffstuff
link the rear
figure out coil rates for the rear
figure out shock valving for the rear
remove entire interior
lots of body work
build front, rear bumpers, sliders
paint
new interior
rebuild transfer case, transmisison (if there is money)

 

[Rezarf]

oh... I see. So a few more weeks huh

 

[AxleIke]

Right now it looks like years.

I've got cheating students, boat loads of homework, a research project, and an old boss keeping my work and home hours too full to think straight. Couple that with a wife who hates this hobby, and things look grim.

But all that aside, I'll never give this up, so while the updates are slower, they'll still be coming

 

[Red_Chili]

Couple that with a wife who hates this hobby, and things look grim.

That right there could be the most expensive part of the project. To extend the drivetrain metaphor... easy on the throttle there, Turbo!

 

[rover67]

Well, it is looking good man, and some progress is better than none.

 

[TIMZTOY]

if ya need some help, let me know.