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post #211 of 1526 Old 12-14-2011, 07:03 AM
SOLIDJP44
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why dont you just get the JEEP WRANGLER JK ROCKJOCK® III REAREND UNIT - 35 SPLINE - BOLT-IN, wouldnt that suffice, its not like your building a buggy or are you? high pinion Dana 60 ring and pinion gear set, Dana 60 35 spline carrier of your choice, and a bearing & set up kit. Im just curious bc it seemed that this set up would be fine for 35s-40s, or am i wrong? what's your take...if your only going to max out with 40s whats the sense of a rj70 and all that jazz... simply bc its knowing that everything is beef while aiming at being a decent dd seems to me to be a bit overkill?


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post #212 of 1526 Old 12-14-2011, 07:45 AM Thread Starter
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The goal is extreme reliability. The 4 door rubi already weighs 4500lbs stock. It's going to be 5000 by the time I'm done with it. Think of how long the wheel base is (116") compared to a TJ (94")

Now think of how much weight shift and leverage there is being placed on the rear axle. Now load the jeep up with 3 people, gear, a fat *** spare tire and spare parts and in bet it'll be siting at 6000lbs. Put the jeep at even a 45* angle and you're placing probably close to 4500-5000lbs of the weight entirely on the rear axle.

Now throw a locker in there 40" tall, 14" wide tires, that are aired down to 3-4psi, so really a 18-19" wide tire, and then 4:1 torque multiplication on 300 horsepower and you've got a recipe for some breakage if it bounces and loads that rear end up.

That's why I was initially wanting the 40 spline right off the bat anyway. Why say no when it feels so good to say yes?

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post #213 of 1526 Old 12-14-2011, 08:04 AM
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Yep, if you're gonna spend the money on a $$$ rear axle do the 70. That's not your standard lightweight rig.

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post #214 of 1526 Old 12-14-2011, 10:58 PM
SOLIDJP44
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Quote:
Originally Posted by spyder6 View Post
The goal is extreme reliability. The 4 door rubi already weighs 4500lbs stock. It's going to be 5000 by the time I'm done with it. Think of how long the wheel base is (116") compared to a TJ (94")

Now think of how much weight shift and leverage there is being placed on the rear axle. Now load the jeep up with 3 people, gear, a fat *** spare tire and spare parts and in bet it'll be siting at 6000lbs. Put the jeep at even a 45* angle and you're placing probably close to 4500-5000lbs of the weight entirely on the rear axle.

Now throw a locker in there 40" tall, 14" wide tires, that are aired down to 3-4psi, so really a 18-19" wide tire, and then 4:1 torque multiplication on 300 horsepower and you've got a recipe for some breakage if it bounces and loads that rear end up.

That's why I was initially wanting the 40 spline right off the bat anyway. Why say no when it feels so good to say yes?

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just curious too where is the 300 horse coming from, is that new stock pen star that much? your deff right as i see what you mean by weight to power ratio and breakage with that kind of weight. yesterday on the scale at the scrape yard i weighed in at 5480 with 40 lbs of scrap tin now i know my trucks true weight minus 40 lbs lol, so yea at a 45* angle, gear, people and a the weight of a jk your deff looking to twist up a rearend that sint beefed up, what the hell get the rj70 ordered up, at $1,800 for the rj60 the rj70 is what probably around $2,200-2,500?..your jeep is gonna be one "raped ape" when its done.

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post #215 of 1526 Old 12-15-2011, 12:44 AM
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Quote:
Originally Posted by SOLIDJP44 View Post
just curious too where is the 300 horse coming from, is that new stock pen star that much? your deff right as i see what you mean by weight to power ratio and breakage with that kind of weight. yesterday on the scale at the scrape yard i weighed in at 5480 with 40 lbs of scrap tin now i know my trucks true weight minus 40 lbs lol, so yea at a 45* angle, gear, people and a the weight of a jk your deff looking to twist up a rearend that sint beefed up, what the hell get the rj70 ordered up, at $1,800 for the rj60 the rj70 is what probably around $2,200-2,500?..your jeep is gonna be one "raped ape" when its done.
That's code for HEMI
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post #216 of 1526 Old 12-15-2011, 06:19 AM Thread Starter
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Pentastar makes 280 horsepower, with a tune, and exhaust they're making around 305hp at the crank

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post #217 of 1526 Old 12-15-2011, 07:38 AM
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Forget CIA and exhaust and go straight to a RIPP

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post #218 of 1526 Old 12-15-2011, 12:43 PM Thread Starter
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Originally Posted by unlrubicon05
Forget CIA and exhaust and go straight to a RIPP
Power isn't really a concern, I have plenty

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post #219 of 1526 Old 12-15-2011, 12:47 PM
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Originally Posted by spyder6 View Post
Pentastar makes 280 horsepower, with a tune, and exhaust they're making around 305hp at the crank

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Which is still around 270-280 or so at the wheels. So you'll be doin pretty good.
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post #220 of 1526 Old 12-15-2011, 05:22 PM
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Originally Posted by jeepdog5 View Post
That's code for HEMI
your still off for a hemi at 300hp.

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post #221 of 1526 Old 12-15-2011, 08:29 PM
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So once to go RJ70 in the rear youll do a RJ-HP60 up front with extra beef? Yea go a little bigger than 40s mtr/k.
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post #222 of 1526 Old 12-15-2011, 08:52 PM
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holy crap man, wanna trade jobs!! lol Absolutely love that color!
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post #223 of 1526 Old 12-16-2011, 05:42 AM Thread Starter
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Originally Posted by MountainMan864 View Post
So once to go RJ70 in the rear youll do a RJ-HP60 up front with extra beef? Yea go a little bigger than 40s mtr/k.
at some point yes, the 44/70 combo seems a little odd, but i don't go down obstacles much so the 44 will last me a while. i know it kinda seems silly buying a Rubicon and then ripping the axles out of it, but its a great platform to jump from

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holy crap man, wanna trade jobs!! lol Absolutely love that color!
me too, i parked next to a '11 Grabber Blue mustang GT yesterday. the color is pretty much nearly identical. grabber has just a tad more teal in it.

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post #224 of 1526 Old 12-16-2011, 08:28 AM
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You'll be able to sell those rubi axles easy too. Seems that's the new fad.

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post #225 of 1526 Old 12-16-2011, 08:30 AM
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We may have to chat about the Rubi axles. I just can't put that stick down.

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