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Unread 07-13-2007, 11:41 AM   #1
KennyTJ
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TJ rear axle upgrade pole:

I just got my July JP Magazine and they have an article showing the top 20 front and top 20 rear axles ranked by strength/durability.

According to JP Mag. "the Dana 44 is morginally better than a D35, and a Ford 8.8 while OK is still only marginally better than a D44 so the D44 and 8.8 aren't worth the effort as upgrades."

I could not belive what I was reading! 8.8 not worth the effort. Sounded like if it was not 1 TON or bettter why bother?

OK, lets here it, what's the best upgrade rout for the Old D35? (I want great big opinions! full of D35 bashing attitued!)



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Unread 07-13-2007, 12:00 PM   #2
mike_dippert
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ok...here we go
only the axle shaft and ring and pinion give an assembly its designation. D44 axle tubes used on TJ's (i know squat about the JK's) are the same thickness as the D35, meaning it can be deformed just like a D35. The front D44 also uses the same outer knuckles as the D30. JP said the ratings are based on factory assemblies, meaning the entire package as it shipped from the factory. Depending how you drive offroad, a D44 could stand up to 35's and a locker, but don't expect it to last as long as you think. A guy i wheeled with has twisted a D44 tube on 33's with a locker. it all depends how you drive.
JP also said that a D135 was the #1 front axle, would you want to drive around w/ a RV axle under your jeep? or even the D80 & D70 they listed. and personally, a D60 is too big unless you go w/ Dynatrac axles.
I'm going to replace my D35 with either a D44 from 4wd (alloy shafts and ARB's) or a 9in (for the versatility and durability).
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Quote:
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JF taught me that the 2.5L, Ax-5 and D35 together are so powerful that angels weep when I shift into 4LO.
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Unread 07-13-2007, 01:15 PM   #3
KennyTJ
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Hey, I'm with you all the way. I've gone 8.8 and just laughed when JP called it "marginally better" than a D35!

Especially after I grenaded my D35!

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Unread 07-13-2007, 03:02 PM   #4
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That's what you get for reading JP magazine.
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Unread 07-14-2007, 10:28 AM   #5
schitzangiggles
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How serious can you take a mag that has that skanked out hag Bree in it just to try and sell a few more issues? Here are some cold hard facts:


Axle strength for a 31 spline Ford 8.8 is reported to be 5,707 pounds-ft yield torque. Yield strength is the point at which the metal deforms, before breaking, which makes it a more relevant figure for determining axles strength. The axle size is 1.29 inches and the material is usually 1040 carbon steel in stock format. 1050 carbon steel is 10% stronger, 1540 carbon steel is 15-20% stronger and 1341H, 1541H and 4340 carbon steel are 20%, 20% and 40% stronger than 1040, respectively. Comparitively speaking, the 27-spline Dana 30 and Dana 35 have a yield torque of only 3,640 lbs-ft., partially due to their smaller 1.11 inch size. (Summary: Ford 8.8 - 5,707 lbs-ft and Dana 30 and 35 - 3,640 lbs-ft) Source: Off-Road Adventures, June 2003

COT: Continuous output torque rating
MOT: Maximum output torque rating
(Numbers from January edition of Fourwheeler, page 60.)
Dana 35 rear axle COT: 870 MOT: 3480
Dana 44 rear axle COT: 1100 MOT: 4460
Ford 8.8 28spline COT: 1250 MOT: 4600
Ford 8.8 31spline COT: 1360 MOT: 5100
Dana60 semifloat COT: 1500 MOT: 5500

Even the "weak" 8.8 is stronger than a D44. Yeah, it is a crap axle, they are jeep gurus and hairy primates leave my lower posterior orafice at a high rate of speed.
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Unread 07-14-2007, 12:51 PM   #6
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Quote:
Originally Posted by dippert
ok...here we go
only the axle shaft and ring and pinion give an assembly its designation. D44 axle tubes used on TJ's (i know squat about the JK's) are the same thickness as the D35, meaning it can be deformed just like a D35. The front D44 also uses the same outer knuckles as the D30. JP said the ratings are based on factory assemblies, meaning the entire package as it shipped from the factory. Depending how you drive offroad, a D44 could stand up to 35's and a locker, but don't expect it to last as long as you think. A guy i wheeled with has twisted a D44 tube on 33's with a locker. it all depends how you drive.
JP also said that a D135 was the #1 front axle, would you want to drive around w/ a RV axle under your jeep? or even the D80 & D70 they listed. and personally, a D60 is too big unless you go w/ Dynatrac axles.
I'm going to replace my D35 with either a D44 from 4wd (alloy shafts and ARB's) or a 9in (for the versatility and durability).
what makes dynatrac's 60's better than junkyard 60's??? most JK 60's will have king pins, dynatracs normally does ball joints, the gears are the same, the inner axles are the same 35 spline as the JK ones. the outers can be eather 30 spline or upgrade to 35 spline dana 70 stubs and this is on bolth axles JK and dynatracs. so im just wondering what make there 60's better. if its WMS i cut a HP 60 ford down to 64'' and hav'nt found a way to break it yet with 39 iroks and all stock axles. you can even go shorter buy cutting down just the long side tube, not busting your balls just wondering why, jason.
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Unread 07-14-2007, 07:20 PM   #7
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Quote:
Originally Posted by jason m
what makes dynatrac's 60's better than junkyard 60's???...
Quote:
Originally Posted by dippert
a D60 is too big unless you go w/ Dynatrac axles
specifically i meant the pro series Dyna 60, the center isn't as big. If you're running 35's, thats a lot of differential to fit over rocks. 37's or bigger and a regular D60 seems reasonable to me.
if i knew of somebody else makes a D60 center that hugs the internals like dynatracs' i would mention that one also.

pic for reference:
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Quote:
Originally Posted by HurricaneRZA View Post
JF taught me that the 2.5L, Ax-5 and D35 together are so powerful that angels weep when I shift into 4LO.
Quote:
Originally Posted by mrblaine View Post
The only thing a bicycle inner tube is good for, is tying a knot in the end of when you run out of condoms.
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Unread 07-14-2007, 08:14 PM   #8
jason m
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Quote:
Originally Posted by dippert
specifically i meant the pro series Dyna 60, the center isn't as big. If you're running 35's, thats a lot of differential to fit over rocks. 37's or bigger and a regular D60 seems reasonable to me.
if i knew of somebody else makes a D60 center that hugs the internals like dynatracs' i would mention that one also.

pic for reference:
nice looking axle, i bet with a little grinding, cutting and welding i can get mine to look like that. ya the make some nice stuff but for the price you cant beat JK axles, jason.
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Unread 07-14-2007, 10:48 PM   #9
mike_dippert
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Quote:
Originally Posted by jason m
for the price you cant beat JK axles, jason.
i'll agree w/ that
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Quote:
Originally Posted by HurricaneRZA View Post
JF taught me that the 2.5L, Ax-5 and D35 together are so powerful that angels weep when I shift into 4LO.
Quote:
Originally Posted by mrblaine View Post
The only thing a bicycle inner tube is good for, is tying a knot in the end of when you run out of condoms.
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Unread 07-16-2007, 07:24 AM   #10
mdm
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The impression I got from the writeup was that a lot of the problem they have with the Ford 8.8 axle is that it is a c-clip axle.
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Unread 07-18-2007, 06:40 PM   #11
mrbates
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pardon my ignorance, but hen you are referring to a "JK" d60 what axle are you talking about? i've been looking for a way to aford60's in the future and while the dynatracs are sexy the price is not
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2003 X. 3" SA. Locked D44s F/R. 35" MTR-K's
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Unread 07-18-2007, 09:29 PM   #12
Wheelin98TJ
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JK axles refers to those from the new JK model Wrangler and they are Dana 44s. The quoted D60 in the pic is throwing you off.

A JK 44 is around $1,300 from the dealer and comes as a complete assembly with JK bracketry.

They have 4.10 gears, e-lockers, bigger ring and pinion than the traditional D44, 32 spline axle shafts in the rear, and high pinion up front. There's probably a few other improvements I'm forgetting.

These axles are a great deal.
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Unread 07-18-2007, 09:55 PM   #13
mike_dippert
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Quote:
Originally Posted by Wheelin98TJ
JK axles refers to those from the new JK model Wrangler and they are Dana 44s. The quoted D60 in the pic is throwing you off.
Quote:
Originally Posted by jason m
what makes dynatrac's 60's better than junkyard 60's??? most JK 60's will have king pins, dynatracs normally does ball joints,...
JK 44's don't have kingpins do they?
i think JK is shorthand for junkyard
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Quote:
Originally Posted by HurricaneRZA View Post
JF taught me that the 2.5L, Ax-5 and D35 together are so powerful that angels weep when I shift into 4LO.
Quote:
Originally Posted by mrblaine View Post
The only thing a bicycle inner tube is good for, is tying a knot in the end of when you run out of condoms.
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Unread 07-18-2007, 10:18 PM   #14
Wheelin98TJ
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Quote:
Originally Posted by dippert
JK 44's don't have kingpins do they?
i think JK is shorthand for junkyard
I didn't read careful enough.

Wouldn't junkyard be JY anyways?
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Unread 07-18-2007, 11:14 PM   #15
mrbates
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Quote:
Originally Posted by Wheelin98TJ
JK axles refers to those from the new JK model Wrangler and they are Dana 44s. The quoted D60 in the pic is throwing you off.

A JK 44 is around $1,300 from the dealer and comes as a complete assembly with JK bracketry.

They have 4.10 gears, e-lockers, bigger ring and pinion than the traditional D44, 32 spline axle shafts in the rear, and high pinion up front. There's probably a few other improvements I'm forgetting.

These axles are a great deal.
what kind of modifications need to be done to these axles to put them under a TJ?

how wide are they compared to TJ axles?
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