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Old October 26th, 2006, 07:56 PM   #1
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Default Various axle shaft strengths, as tested to failure by Bobby Long..

I couldn't find the other thread about this, so posting here:

This is a of stuff from Pirate. Theres a lot of Toyota stuff tested, since Longfield is primarily a toy parts guy. I know a few things are out of date. The 2nd gen 30 spline longs that I have are rated over 9000 ft-lbs.

Product................................ft-lbs....degrees

Yukon 4340 Dana 60 35 spline............12,000.....130

Stock Dana 60 35 spline..................6,500......35

Yukon 4340 Dana 44 30 spline.............5,800......35
Stock Dana 44 30 spline..................5,000......35

Yukon 4340 Birf Elim 30 spline...........5,000......50 (ear failure)

Longfield 4340 30 spline used............8,500.....175 (shaft failure)
Longfield 4340 27 spline.................6,500......75
Stock Toyota Birf........................4,200......45
Profield Birf............................3,500......30

Toyota Front Inner axle, 27 sp Stock.....5,000......45
Toyota Front Inner axle, 27 sp 4340 Pig..?,???......??
Toyota Front Inner axle, 27 sp 4340 Long.?,???......??
Toyota Front Inner axle, 27 sp 300M......7,000......??
Toyota Front Inner axle, 30 sp 4340......?,???......??

Toyota Rear Axle Shaft, Stock............6,500.....110
Toyota Rear Axle Shaft, Superior 4340....7,600.....160
Toyota Rear Axle Shaft, PIG 4340.........?,???......??

Toyota T-case output shaft, Stock........2,500......65
Toyota T-case output, AllPro 8620 .......2,500......60
Toyota T-case output, Marlin Treated ....2,500......10 ?
Toyota T-case output, Longfield Treated..2,500......20 ?
Toyota T-case output, Longfield Treated..3,000......48 ?
Toyota T-case output, Longfield 4340.....4,000......25

Warn Locking Hub (for Toyota axle).......5,000

Toyota Hub Gear, Stock...................5,800
Toyota Hub Gear, Longfield Treated.......6,800
Toyota Hub Gear, Longfield 4340..........7,500

Toyota Drive Flange, Stock...............6,000
Toyota Drive Flange, Longfield 4340......7,500 (broke 6 - 5/16" bolts)
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Old October 27th, 2006, 09:35 AM   #2
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Very interesting, thanks for posting this up. This, combined with seeing the abuse Toy axles have taken under some of my friends' rigs, has me rethinking my axle choices on a couple rigs. I like the clearance of the 8", and it is easy to trim for more clearance, but I would think I should gusset the housing some. Hmmm......
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Old October 27th, 2006, 09:50 AM   #3
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I'm thinking of buying a diamond housing, or actually building one from scratch. Not *that* hard to do, with the 3rd member style diffs.


BTW, you can get some wider axles out there in the 8" pattern.

up to 1985, toy axles are 55.5" wide front, 55" wide rear.

1986+ trucks uses a 58.5" wide rear axle, and an IFS front.

Late model 4-runners use a 60" wide 8" rear

T-100s and some Tundras use a 66" wide 8" rear.

I'm thinking about maybe building a front housing to be 3" longer on each side, to come to 61.5" wms-wms, then run a stock 1986 rear with 1.5" spacers on both sides.
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Old October 28th, 2006, 01:41 PM   #4
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wish they showed the dana 30 , id know how much of an upgrade the 44 will be .

the 4340 shaft V's stock dont seem to be a much of a up grade by them numbers .
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Old October 28th, 2006, 02:10 PM   #5
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Niether Bobby Long nor the Tinbenders care one bit about the D30. Besides, the strength you will gain by swapping the front D30 to a D44 will be in the carrier and R&P (which weren't tested, and can't be as easily) and the shaft, but most TJ/ZJ/etc D30 failures are still at the u-joint, which isn't any stronger unless you upgrade it and the shafts in the D44. Now, a D44 with upgraded shafts and u-joints is a better idea, but the strength vs cost (and effort) doesn't come out well, IMO, compared to a D60 swap. Upgrading the shafts and u-joints on a D30 doesn't work out as well as the D44, however, since then then the carrier or splines end up becoming the weak point.
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Old October 28th, 2006, 03:38 PM   #6
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The 44 will be after markey shafts , maybe CTM joints too . Im going to leave the lock out the weak link . Much easier to replace on the trail .

Last edited by Grandman; October 28th, 2006 at 07:28 PM.
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Old October 28th, 2006, 07:12 PM   #7
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I hear ya'. I kept debating going to a 44, but I couldn't justify going through the effort to swap one in the TJ, since my only failure has come from bending the front housing in a rollover. I also still have kept the front end alive on 35" Boggers and Q78 TSLs, so my next upgrade in tire size is going to be 38.5x11.00 Boggers and 38x12.50 TSLs, which are marginal for the D44 anyway. I'd hate like hell to go though all the trouble to swap in a D44 and then start pitchin u-joints.

G-Man, your situation is probably different than mine, due to the fact that the ZJ has more weight over the front end than my TJ does, and it is probably much harder on axleshafts. I have a hard time keeping the front end of the TJ on the ground on the steeper climbs, while my ZJ doesn't seem to have those issues. (Which is partially a WB issue, but also engine weight and placement) I have been wheeling with a ZJ on 37s lately, and have noticed how his rig loads the front end on the rocks compared to my TJ.

Haggar- what do you think of running an FJ60 or FJ80 front end along with an IFS 8"? I know it is a bigger differential than the 8"- the size of the carrier is pretty beefy (I think the ring gear is something around 9 1/4" or so), and I thought the FJ60 was around the same width as the IFS rear. The other idea would be to try to widen an 8" front, which might be interesting with a sheetmetal housing, but still seems easier than fabricating one from scratch to me.
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Old October 28th, 2006, 07:30 PM   #8
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Yep the Grand with the cage , bumpers and winch are setting at 5,000 lb
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Old October 28th, 2006, 07:34 PM   #9
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Yikes! that is almost 1200Lbs more than my TJ (And TJs are pigs)
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Old October 29th, 2006, 08:01 PM   #10
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FJ80 fronts might be a bit hard to come by. Actually, the ones with the factory locker use the same 8" ring and pinion, but in a high pinion version.


btw, Bobby Long posted pics in this thread of his axle breaking machine.
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Old October 30th, 2006, 10:32 AM   #11
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Quote:
Originally Posted by Haggar View Post
FJ80 fronts might be a bit hard to come by. Actually, the ones with the factory locker use the same 8" ring and pinion, but in a high pinion version.
All FJ-80 and FZJ-80 fronts are a high pinion 8" diff, both locking and open.
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