T-case options?

[wag4x6]

I have an 89 G-Waggy, soa/sf on 35's. I have brisen 2 NP229's in the last 3 months. I'm over it! What are some non-Atlas options do I have for stronger cases and what needs to be done to make it happen?
Thanks

[REDONE]

NP208. Just make sure it's from another fill size Jeep.

[derf]

NP208. Just make sure it's from another fill size Jeep.

This would be my first choice as it's the easiest swap.

An NP231 from a Wrangler or XJ Cherokee can work as well. An NP242 from an XJ, ZJ, or WJ could work too.

If you're able to do some customization, a flipped Dana 300 can work.

[csuengr]

Brisen. I was hoping that was some new slang or something.

[WT91]

I have never broken an NP229...and I wheel it and abuse it and neglect it to the fullest. I just have to ask...what are you doing that keeps breaking them?

[rocklaurence]

NP208. Just make sure it's from another fill size Jeep.

This would be my first choice as it's the easiest swap.

An NP231 from a Wrangler or XJ Cherokee can work as well. An NP242 from an XJ, ZJ, or WJ could work too.

If you're able to do some customization, a flipped Dana 300 can work.

The NP231 with SYE would be my first choice and dont be concerned with the chain width [some will tell you its not strong enough].

[wag4x6]

I have never broken an NP229...and I wheel it and abuse it and neglect it to the fullest. I just have to ask...what are you doing that keeps breaking them?

Welllll, the one I broke about 3 months ago, I hit a Rock in the middle of the trail going about 5mph, instantly stopped the Jeep. I put it in reverse and broke the front case half at the transmission.
the one I broke this past weekend had some 2ft whoops involved and speeds in excess of 50mph, launched the Jeep and that was the end of it.

The weird thing is I didn't start having a problem until I put on a set of 35" Goodyear MTR's. I had a set of 35" Maxxis Bighorns before that.

[babywag]

I have an AMG NP242 HD case out of a 1994 H1 Hummer.
Do some research and see if you can make it work behind a 727?
Input shaft would need to be swapped out IIRC it's 32 spline.
It's also slip yoke on rear, and a beefy dude, built in cooler as well.

Also NO mechanical speedo output, but I think that can be changed as well?

[Nikkormat]

I think it's fair to say...

This thread is worthless without pictures!

[wag4x6]

This is when it broke a couple months ago. The break from this weekend looks identical....

[Tatsadasayago]

4x6, that break looks suspiciously like the many XJ Cherokee cases I replaced at the dealership back in the day.
Back then, the cause was hitting a curb or parking lot stop (Something women seem to do often) that caused the axle to move to the rear, compressing the driveshaft slip yoke and breaking the case.
I can't say I remember an SJ doing this without catching big air or a rock, but the cracks look very similar.
I do recall there being a metal brace arm installed on the side on later models, but may be confusing GWs with a GM model of the same vintage.

[Nikkormat]

Maybe you're bottoming out your driveshafts?

[j20brett]

Seems like the real problem here, bottoming out the driveshaft, compressing into the tcase.

[wag4x6]

For those of you that say I'm bottoming out my drive shaft I agree with you. Both times it broke there was a very quick stop involved.
The way my front end is set up I have more extension than compression on my driveshaft.

[Stuka]

Do you have a shackle reversal up front (shackle in back). If so, I can pretty much guarantee your issue is the shaft bottoming out. You need more compression when you have a rear shackle as the axle moves backwards as it moves up. It can happen with the stock front shackle, but requires the springs to bend.

[j20brett]

So there you go, shorten the driveshaft up an inch and get another 229.

[wag4x6]

Do you have a shackle reversal up front (shackle in back). If so, I can pretty much guarantee your issue is the shaft bottoming out. You need more compression when you have a rear shackle as the axle moves backwards as it moves up. It can happen with the stock front shackle, but requires the springs to bend.

stock configuration

[WT91]

If you have shackle in front of spring and you are cracking cases like that, I think its time to invest in some bumpstops or some new springs. I can only imagine that happening with clapped out, sagged out springs in an SOA doing really rough stuff with no bump stops. Often overlooked component when it comes to these old beasts and lifts...but they exist for a reason.

[wag4x6]

If you have shackle in front of spring and you are cracking cases like that, I think its time to invest in some bumpstops or some new springs. I can only imagine that happening with clapped out, sagged out springs in an SOA doing really rough stuff with no bump stops. Often overlooked component when it comes to these old beasts and lifts...but they exist for a reason.

I have bump stops and have a sort of Frankenstein spring pack that works really well.

[WT91]

Well I'm not sure what to tell you then. If you break the 229 like that, you will break any transfer case. Something isn't right in your setup someplace, and I wouldn't look at the 229 as the culprit.

If you were bump stopped properly to prevent too much suspension compression, I can't see how this would even be possible. The front axle would have to move directly backward. What does your front driveshaft look like at ride height?