Which front chromoly shafts for Dana 30?

[Jerry Bransford]

I’ve run both u-joints and RCV’s in my 60s, hard. I do prefer the RCV’s. And I actually like when I’m at full turn, clawing for traction, and the front wheels turn at a constant speed. That is a thing compared to U-Joints. Now whether or not it makes actual difference in getting up an obstacle, I don’t know - but I still prefer it.

I’ve also never broken an RCV, so I like ‘em.

I've never broken either of my two different 4340 shafts, 30 spline in my Dana 44 and not even the 27 spline Warn shafts in my previous Dana 30.

 

[starkey480]

I've never broken either of my two different 4340 shafts, 30 spline in my Dana 44 and not even the 27 spline Warn shafts in my previous Dana 30.

27 spliners in my Dana 30 a few years ago. 30 splines have been great since.

 

[Jerry Bransford]

27 spliners in my Dana 30 a few years ago. 30 splines have been great since.
View attachment 510741

4340? I will agree it's not impossible to twist them, I just never had any problems with the 4340 27 spline front shafts in my previous TJ.

 

[starkey480]

4340? I will agree it's not impossible to twist them, I just never had any problems with the 4340 27 spline front shafts in my previous TJ.

Yeah those were 4340 U.S.A. Standard Gear shafts

 

[Jerry Bransford]

Yeah those were 4340 U.S.A. Standard Gear shafts

What size tires?

 

[starkey480]

What size tires?

35s on very tough trails

 

[MrTeak]

If you like hard wheeling I’d recommend going 30 spline inners for the front shafts if you are planning on getting a locker anyways.

I have a TrueTrac lsd in the front so have to stay with 27 spline. I’m getting a locker in the rear no plans for a locker in the front right now.

 

[NWPA Jeepy T]

Thread resurrection:
Do 4340 chromoly shafts rust like factory shafts?
I live in the rust belt and my u joints get rust seized in there so you need a C press or bigger, which bends the ears. I bent my ears & need to replace. Ten Factory is a decent price from Rusty's, and they come assembled. Is it worth my while to disassemble them, grease the inside of the ear holes and reassemble?
This pair of u joints was in there 2.5 years and it sounded like a 22 when they finally let loose on the press
Thanks for any input

 

[sab]

Do 4340 chromoly shafts rust like factory shafts?

Short answer: No.
Long answer: Some of the alloying elements in 4340 reduce corrosion, but unfortunately, it's not enough to make much of a difference. It rusts, but marginally slower.

 

[NWPA Jeepy T]

Short answer: No.
Long answer: Some of the alloying elements in 4340 reduce corrosion, but unfortunately, it's not enough to make much of a difference. It rusts, but marginally slower.

Recommend the disassembly/ grease/reassembly idea?

 

[sab]

Recommend the disassembly/ grease/reassembly idea?

I really don't know if that would make a difference or not, but if you do decide to do it, I'd recommend anti-seize, not grease.

 

[Jackjack97]

I have G2, came on my axles, and have been super solid. If you really want Revolution, I’d run what you have until they come in on the front, but it depends if you’re going to be hitting it hard right after the Super 35, although I wouldn’t think so during break in, but who knows.

There are some others folks may suggest.

And some may warn “don’t drive a day on those stock shafts” but I think you’ll make the wait.

The stock shafts will be just fine if you are nice. I run bead locks and 37s on the rubicon with a HP 30/44 combo on stock shafts and have been fine so far. I plan to move up to revolution chromalloys shortly though.