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Unread 09-28-2010, 07:52 PM   #1
360yj1989
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what should i upgrade first??

I've got an 89 yj that the previous owner put a recently rebuilt amc 360 into. other than the motor it is pretty stock other than the 4 inch lift and 33" tires. the dana 30 up front also has a locker. I'm pretty sure it's got the ax 15 and your basic dana 30/35 set up. I want to do some mild offroading with the jeep and i'm afraid that this motor is going to make these stock components go off like a bomb. I forgot to mention that the motor has been bored out (not sure how much) and has an upgraded cam, roller rockers, 750 cfm carb, edelbrock performer intake and many other upgrades. I believe it is pushing 400 hp. my question is what should i upgrade first and to what? i'm on a very limited budget.

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Unread 09-28-2010, 07:56 PM   #2
moonshinefuel
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The rear axle probably, if its still the dana 35.
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Unread 09-28-2010, 09:26 PM   #3
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Yep rear axle.
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Unread 09-29-2010, 06:38 AM   #4
360yj1989
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Would a dana 44 be strong enough or would i need to save up for a 60?
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Unread 09-29-2010, 06:41 AM   #5
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Originally Posted by 360yj1989 View Post
Would a dana 44 be strong enough or would i need to save up for a 60?
a complete set of 60's goes for 500-1000 around me. And if I were you would not waste my time with dana 44's.
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Unread 09-29-2010, 07:22 AM   #6
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For comparison... I have a 1995 with 360cid,turbo 400 tranny, dana 44's from a scout2, OX lockers front and rear. I kept exploding front axle shafts and ujoints untill I upgraded to chromoly shafts and 300m ujoints ($750).. Everything is now holding up fine. If I was to build this rig from the ground up, I would just install stock dana 60's and be done with it.
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Unread 09-29-2010, 10:38 AM   #7
BJsWrangler
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this discussion has gotten me a little scared....I've got a 350/700-R4 turning my stock D30/35 setup. What causes the issue that requires upgraded axles? Is it just the more powerful engine? Or does it also have to do with the type of wheeling you do? Is this something that is just going to happen one day while I'm driving home from work?

Just for reference, my YJ is my DD, so I do highway driving with it all the time. When I wheel (I got it in Aug), its mainly going to be Jeep trails in CO.
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Unread 09-29-2010, 10:49 AM   #8
Wrangler11
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With the 360, there is no question the rear end needs to be swapped out first. I'd throw a 8.8 in and not a d44. Cheaper and stronger. They are also very easy to be found.
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Unread 09-29-2010, 10:52 AM   #9
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Quote:
Originally Posted by BJsWrangler View Post
this discussion has gotten me a little scared....I've got a 350/700-R4 turning my stock D30/35 setup. What causes the issue that requires upgraded axles? Is it just the more powerful engine? Or does it also have to do with the type of wheeling you do? Is this something that is just going to happen one day while I'm driving home from work?

Just for reference, my YJ is my DD, so I do highway driving with it all the time. When I wheel (I got it in Aug), its mainly going to be Jeep trails in CO.
The D35 is a ticking time bomb. Someone will chime in here and say "it's the best axle ever and they wheel it hard and it never broke" Good for them. For every one of those stories there are 20 more where one broke pulling out of the driveway.

Long story short, if you go easy and especially if you have an auto trans, it might last forever. Or not.

Just make sure to carry spare shafts, tools and the knowledge how to swap them on the trail.
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Unread 09-29-2010, 10:56 AM   #10
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8.8 all the way then an Atlas xfer case.

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Unread 09-29-2010, 12:55 PM   #11
Wrangler11
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8.8 all the way then an Atlas xfer case.

Dwayne
If he's got a np231 an atlas xfer case is a waste of money in my opinion.
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Unread 09-29-2010, 01:05 PM   #12
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If he's got a np231 an atlas xfer case is a waste of money in my opinion.
With an estimated 400hp ( I think that is high and I would stick it on a dyno to get facts) he stands a real risk of shattering the case if he gets a little froggy on the go pedal.

Dwayne
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Unread 09-29-2010, 02:45 PM   #13
Wrangler11
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Originally Posted by 4.7stroker View Post
With an estimated 400hp ( I think that is high and I would stick it on a dyno to get facts) he stands a real risk of shattering the case if he gets a little froggy on the go pedal.

Dwayne
I'm pretty sure its tq that effects the np231 and I am also pretty sure the np231 can with stand a decent about of tq.
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Unread 09-29-2010, 05:06 PM   #14
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The 231 can be used safely in high HP aplications... Yes there is a higher probability of exposing any weaknesses in the casting, but overall the np231 is a cheap, reliable little toad.

Before I get hounded, let me put it this way... In a vehicle with a v8 conversion, would you put your money on the d35 or the np231 to give out first? My money is on the d35... My buddy's d35 went out 2 1/2 months after his small block was installed... the 231 is still alive, as well as the d30, with 37's.

Btw... dont lose the posibility of a ford 9" as the rear axle (and front axle if your feeling really ballsy)... D60-like strength, easy to re-gear, very light, legendary in name, and plenty of aftermarket support. Not saying it's better than any other axle in it's class, but still something to think about.
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Unread 09-30-2010, 05:50 AM   #15
360yj1989
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as far as the hp estimate I am just guessing but the motor came from a 71 hornet with the stock horsepower being around 295 (according to the net) and with all the upgrades (cam, roller rockers, motor being bored out, compression being high enough you have to run 93 octane with a bottle of octane boost to keep it from diesling, 750 carb) i would say its gained 100 or more since birth. I've been dying to dyno it but i cannot find one close enough that it wouldn't cost me $100 in gas to get to. All i know is that it has way more power than required.

Which of these axles that you all have mentioned am i not going to have to do much custom fab work to get under the jeep?
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