FF 30spl vs SF 35spl

[TRINDU]

Due to the parts I've amassed, I can go either way.

D44 rear axle, would you run:

• Semi float 35 spline (G2 axle shafts, $250/pair)

Or

• full float hubs and limited to 30 spline due to D44 hubs/spindle. Currently have unknown brand shafts, but there's always dutchman for $500/pair.

This is a do it once scenario. I'm leaning towards 4340 FF vs the Chinese 1541 SF.

 

[Beat95yj]

Get new spindles or bore what you have. 35spline FF.

 

[total newb]

Do d60 outers for the ff and 35spl ff for the same amount of work.

 

[Opiebennett]

Get new spindles or bore what you have. 35spline FF.

This.

Or unit bearing cups.

 

[Rangerrod]

If bolt pattern is no concern full float 35 spline.

 

[TRINDU]

Damn it

I own everything already to go FF 30 spline. I'm one shaft ($120 amazon) short of going semi float 35 spline.

If yall had everything sitting in front of you on the shelf, ready to bolt/press together
Which way would go?

I'm leaning towards full float because I think 30 spline is plenty enough already and have my doubt with chinesium shafts.

I'm not spending money to buy/build a 35spl FF

I buy people's failed hopes and dreams and this shit collects of the shelf after I sell off the rest.

 

[Opiebennett]

What locker do you already have? How many splines does it have?

Unit bearing cups, then run 30 spline full float with 99-04 bearings unmodified.

Then you can break one 30 spline shaft, and buy a locker, modified unit bearings, and new shafts later and spend extra extra more than you wanted.

 

[Opiebennett]

Also, what is this going in? what bolt pattern? What front axle are you pairing with it?


A CJ-5 on 32's with a 3.5" tube roll bar wrapped in electrical tape?

4600 car?

A sled pull truck with a plow on the front, so you can get permission to post in plow hub?

 

[Oddball]

To choo choo choose 35 sf

 

[TRINDU]

What locker do you already have? How many splines does it have?

ARB in 30 and 35. Albeit I'm debating on JK gears so may want to horse trade someone for a 3.73 carrier.

Unit bearing cups, then run 30 spline full float with 99-04 bearings unmodified.

No to 8 lug

Then you can break one 30 spline shaft, and buy a locker, modified unit bearings, and new shafts later and spend extra extra more than you wanted.

trying to avoid that

Also, what is this going in? what bolt pattern? What front axle are you pairing with it?

A Jeep. 5x5.5. D44

A CJ-5 on 32's with a 3.5" tube roll bar wrapped in electrical tape?

4600 car?

A sled pull truck with a plow on the front, so you can get permission to post in plow hub?

Trying to remove that aspect, which one is better and why?

 

[Beat95yj]

What size tire?

 

[arse_sidewards]

I vote 30spl.

You probably won't break anything and if you do it'll probably take years at which point you'll be one pair of shafts away from having a setup where the R&P is likely to be the weak link (unless you go JK44)

 

[total newb]

Id 35spl sf over 30spl ff.
They both have adavantages but id take the bigger shafts than the ff.

 

[total newb]

Im prob behind the curve on new d44 stuff but i didnt think you could 35spl d44 because of the throat on the carriers?

 

[Rangerrod]

With the above info. Since the 44 front is 5x5.5” I’d go 35 spline sf

 

[RustyC]

35 spline FF with whatever hub solution.
35 spline SF with GOOD shafts.
30 spline FF

 

[RunningProblem]

If you break a full float shaft can you get off the trail easy?
If you break a semi float shaft can you get off the trail easy?

 

[TRINDU]

Id 35spl sf over 30spl ff.
They both have adavantages but id take the bigger shafts than the ff.

I'm not a metallurgist, what is the advantage of 1.5" SF 1541H vs 1.31" FF 4340?

35 spline D44 ARB is pretty common.

I need to play with the parts and see if the disc will fit the FF hub, alignment wise. That will definitely we a determining factor

 

[Bebop]

35sp SF

 

[Beat95yj]

I'm not a metallurgist, what is the advantage of 1.5" SF 1541H vs 1.31" FF 4340?

35 spline D44 ARB is pretty common.

I need to play with the parts and see if the disc will fit the FF hub, alignment wise. That will definitely we a determining factor

A person could look up the material properties and do the math, but let’s just bitch about it instead.

 

[u2slow]

I bang around with 4340 30spl shafts in a mostly stock cummins truck; lockright and 5spd. Shafts are holding up fine. (Yukons; made in India).

 

[RunningProblem]

I'm not a metallurgist, what is the advantage of 1.5" SF 1541H vs 1.31" FF 4340?

35 spline D44 ARB is pretty common.

I need to play with the parts and see if the disc will fit the FF hub, alignment wise. That will definitely we a determining factor

A person could look up the material properties and do the math, but let’s just bitch about it instead.

Tech Info | Dutchman Axles

Dutchman designs and manufactures replacement and custom rear ends, hi performance front and rear alloy axle shafts and has a large selection of off the shelf components including ring & pinion gears, Eaton and Wavetrac limited slip positraction carriers and differentials, full spools, billet...

dutchmanaxles.com

Axle Materials:

4340 vs. 1541-H. 4340 has more tensile strength than 1541-H, will take more twisting forces, but cannot take bending forces as well as 1541-H.
Flanged axles are overhung beyond the wheel bearing and are subject to these bending forces-especially in the world of wider and/or larger diameter tires. The hard case and soft core design of a 1541-H flanged axle enable the shaft to bend, flex, and spring back.

Properly executed, both 4340 "thru hardened" and an upgraded 1541-H "induction hardened" shaft can achieve nearly the same results in strength in the area of torsional strength (twist forces), but the design of an induction hardened shaft usually yields more bending (life) cycles than a thru hardened 4340 shaft. 4340 is more expensive than 1541-H, thus is reserved for the front shafts only which need the heat treated U-Joint ears for strength reasons.

 

[Skinny]

Did I miss the truck specs and usage?

Not sure why I would say this but a quality semi float shaft is probably more then enough for most light duty use. Fuck how many Toyotas on 40s are in this boat?

 

[total newb]

Tech Info | Dutchman Axles

Dutchman designs and manufactures replacement and custom rear ends, hi performance front and rear alloy axle shafts and has a large selection of off the shelf components including ring & pinion gears, Eaton and Wavetrac limited slip positraction carriers and differentials, full spools, billet...

dutchmanaxles.com

Grunt grunt pick nose.

More metal is gooder.

 

[TRINDU]

A person could look up the material properties and do the math, but let’s just bitch about it instead.

I went to public school and not capable of maths

Mr Stubs Didn't you go through this a while back?

 

[Provience]

vote for full float 30sp

easier to deal with and less stress on everything

 

[TRINDU]

Well, shit.

Apparently I don't know one 44 from another, and still don't . What two patterns am I looking at here?

The smaller is a G2 YJ direct replacement 44.

But I believe uses 8.8 brakes?

And a G2 30 vs 35 shaft

The 'custom' D44 full float rear I acquired

 

[TrailTamer]

FF 30 spline 4340

 

[Rangerrod]

looks like a axle end that accepts gm small bearing spindles that someone drilled an extra hole to capture the spindle in another spot.

I have similar axle but Dana 60 center gm small bearing spindles that have been bored to accept 30 spline shafts. I went with 300m shafts and with 37’s and an ls is holding up so far.

You’re not going to be able to run 35 spline shafts with that axle.

 

[Ghetto Fab.]

I have seen several 40spline SF shafts that are now junk simply because the flange end bent. Personally I like FF stuff anyway so thats the direction I would go.