Roasted Another Poly Perf. Chromoly FJ40 Axle

[Sputnik40]

IIRC, Marlin has something, but not sure if they are the same design or not...

I never broke stock rear FJ40 shafts and 38.5's....got really good at coarse pinions tho....

Too funny - went thru 3 pinions with the 38.5's, and one stock shaft. One pinion and two Poly long sides with 39" Red Labels...

 

[Sputnik40]

I'll be learning how to narrow down a FF D60 (have one) or do what Al is doing - narrow the 14 bolt.

I have both of these under the rears of each of my projects. In the long run, IMO it's a cheaper option, R & P's for both of these are stouter (i.e. ring gear is 2X thicker than LC's), lockers are *cheaper, both could have pinion flanges like the LC's, & w/ 6 lug hubs I've seen for both available. Besides, your not limited on 1.3" shaft dia. Shave the bottom, & before you make the cut on the right side, you may want to run wheel spacers up front & have a little wider track width in the rear. I'm sure Steve at differentialengineering.com (he's also in FL.) can hook you up easy.

I'll be talking to you a bit. Will you be at GSMTR? I have the FF D60 and if it's a 4.10 as promised (guess I need to look at the housing) I'm told that I can go 4.56 no problem. I'd really like to do that, slap a cheap locker in, and narrow it down. Would need the 6 lug conversion as well. Running 2" spacers up front...

...but am getting way ahead of myself (this is what I should have done earlier this year) as GSMTR is up and that will wait until I find a pile of money somewhere?

 

[Tapage]

Reading this thread about polys .. make me think about a rear FF instead of polys ..

Sure Toyota FF ( to me ) that it's way more easy to found than a 14B FF down here ..

 

[LC_Hamma]

Reading this thread about polys .. make me think about a rear FF instead of polys ..

Sure Toyota FF ( to me ) that it's way more easy to found than a 14B FF down here ..

You ain't outta luck as *some 60 series used factory offset D60's in Venezuela ;p Not sure if those were the 30 spliners or if it had the spindles large enough to house 1.5" dia. shafts....

 

[LC_Hamma]

I'll be talking to you a bit. Will you be at GSMTR? I have the FF D60 and if it's a 4.10 as promised (guess I need to look at the housing) I'm told that I can go 4.56 no problem. I'd really like to do that, slap a cheap locker in, and narrow it down. Would need the 6 lug conversion as well. Running 2" spacers up front...

...but am getting way ahead of myself (this is what I should have done earlier this year) as GSMTR is up and that will wait until I find a pile of money somewhere?

Nope, won't make the trek to smitter this year as one rig is being upgraded (40) & the other is being built (55).
There's a carrier break - 4.10 down & 4.56 up. So if it's a 4.10 carrier & you wanna weld it up or run a Lockright, you can't just swap out lower gears on that carrier, you'll need the 4.56 carrier. I run Detroits in both my rears w/ Moser shafts. If yours' is a 30 spliner, like mine, I'd go ahead & get Mosers/ Dutchman (cromo), etc. both sides. PM me for additional info.........

 

[Sputnik40]

Nope, won't make the trek to smitter this year as one rig is being upgraded (40) & the other is being built (55).
There's a carrier break - 4.10 down & 4.56 up. So if it's a 4.10 carrier & you wanna weld it up or run a Lockright, you can't just swap out lower gears on that carrier, you'll need the 4.56 carrier. I run Detroits in both my rears w/ Moser shafts. If yours' is a 30 spliner, like mine, I'd go ahead & get Mosers/ Dutchman, etc. both sides. PM me for additional info.........

Will be in touch after GSMTR. That carrier breakdown sucks - but I guess I could rebuild the front ARB back to 4.11 again .

I'll post an axle pic in a minute - was supposed to have Moser shafts - but looks like one is aftermarket, one stock... I honestly don't know anything about 60's - but will learn soon enough.

 

[Sputnik40]

This was the first - 11/2007 - You can see the bend at midshaft - actually the whole damn thing was bent. Snapped at midpoint and splines twisted...

 

[Sputnik40]

Here's number 2 - bent so bad it the c-clip wouldn't come off, and the axle was bound up between the carrier and the outer bearing. Outer bearing and seal fragged.

 

[Sputnik40]

Here's the rear axle I have no clue about yet...

 

[Sputnik40]

I'll start a thread on this later this Summer mayhaps...by carrier do you mean any carrier can fit in the housing? Or do you mean I need a different axle/housing? Plan on buying a locker of somesort, perhaps Detroit is the way to go - I like a strong posi rear - Detroits can be tightened down pretty stout right?

 

[bustanutley]

if you are planning to get a detroit anyway the carrier difference makes no difference for you.

 

[LC_Hamma]

if you are planning to get a detroit anyway the carrier difference makes no difference for you.

Guess I didn't explain it fully

I'd swap out that pinion yoke for a full flanged one so you're not relying on those u-bolt straps as they'll snap easy. I had my aftermarket shaft flanges reamed for cone washers, just like the factory one's. I have a new (installed but never run) low case Detroit for 30 spline if you're interested.....

 

[Sputnik40]

I'd be interested in the Detroit if I could build it with 4.56 - not sure what low carrier means, but guessing it's the opposite of high pinion? Can't commit to anything until after GSMTR. Not knowing what I might break - won't do me any good to have a half pieced together rear axle and be broke...

Definitely will be going with a flange - will be running my mini-CV shaft for a while - and then since I already have a 1350 CV flange on the Orion - will upgrade later. After so much rear axle breakage - kinda looking forward to maybe having a driveshaft weak link...

Back at it - fawking near 90 out, painting my sons Westfalia bumpers in polyurethane, putting the axles back together and just finished chopping some square tube to make a rock ram mount.

 

[LC_Hamma]

Low case = low gear carrier ;p
I'm only using the 30 spliner cuz I don't plan on runnin any larger tire than what I have on it now. If you think 42's are in your future, go for the 35 spline for sure. Then, you'd need to clearance your spindles & get a 35 spline Detroit, which are always in the for sale section on the PBB.

 

[Mace]

If I were you, I would pull that axle apart.

It might already be 35 spline.

If you get Big Bearing 9" ends you can shorten that 60 to whatever WMS you want and run SF six lug 35 spline shafts ..


If the inner shafts are 30 spline, you are not upgrading axle shafts much at all over the poly stuff.

 

[peesalot]

them 3 " wheel spacers are bending those shafts. you prolly run 2 " bs rims ontop of those spacers huh ?

 

[wngrog]

I hate to agree with anyone that runs Groundhawgs.......but Pees may be on to something here...

 

[TURNMEOVER]

Ok I have been following bills thread here and the whole spacer thing gave me some hope. I plan on 38.5 x 12.50 tsl bias . I will have the same drive line as bill and . I need to run atleast A 1" spacer to clear the front calipers. Do you fell this will be ok or should I step down to 36 or 37 " tires ?

 

[peesalot]

Well, I dunno but I know I run 1.5" spacers on poly rears with 15 x 10 rims with 2.5" of bs and have hopped the hell outa 37's with no breaks. To be fair I also have not had the axle apart to see if the poly rears are showing any signs of twist or spline issues. IMO a 38" tire alone , you are o.k., a 38 plus 3 " spacer + alot of bs = time for a ff axle.

Hawgs are gone, waiting till I can get a 39" sticky Hawg then they be back.

 

[baxter650]

The Poly axles that you all are breaking, are they semi or full floaters?
And just what does Mr Long do to his axles that makes them so tough?