231 bolt pattern? - JeepForum.com
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post #1 of 7 Old 07-23-2019, 03:39 PM Thread Starter
bobracing
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Crossmember trans/231/D300 mount (was: 231 bolt pattern?)

Updated: drop down to post 5
And I can’t figure out how to change the original post name.


Anyone know, or know where to get the np231 adapter bolt pattern?
My Google fu just isn’t strong today.

Want to get rid if the skid plate trans mount and make the crossmember style support. When adding the crossmember I also want to tie the trans, doubler, and xfer together too, the bottom two or four bolts being a nice place to add a tie-in/support.


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post #2 of 7 Old 07-26-2019, 05:51 AM
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Quote:
Originally Posted by bobracing View Post
Anyone know, or know where to get the np231 adapter bolt pattern?
My Google fu just isn’t strong today.

Want to get rid if the skid plate trans mount and make the crossmember style support. When adding the crossmember I also want to tie the trans, doubler, and xfer together too, the bottom two or four bolts being a nice place to add a tie-in/support.
Novak or Advance adapters would be my first bet.. You can probably get the thin mounting gasket and use that as reference

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post #3 of 7 Old 07-26-2019, 10:41 AM Thread Starter
bobracing
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Ended up using a 208 pattern that I forgot was floating around.
Got most of it done last night, just need to finish weld and put it together for tomorrow.
There was a lot more work into this crossmember than I thought.
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post #4 of 7 Old 07-26-2019, 02:51 PM
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Quote:
Originally Posted by bobracing View Post
Ended up using a 208 pattern that I forgot was floating around.

Got most of it done last night, just need to finish weld and put it together for tomorrow.

There was a lot more work into this crossmember than I thought.


It’s very much worth the work in my opinion. It’s very nice to be able to just pull the skid anytime you need access down there.
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post #5 of 7 Old 07-26-2019, 09:16 PM Thread Starter
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This was suppose to be an easy afternoon maybe finish a little up the next day after work. Yea, there was a lot more work involved to be starting Wednesday afternoon (cool day of the week) and finishing Friday night for a little wheelin’ trip Saturday.

Crossmember: happen to have a couple bent pieces of tube that worked.
Bushing: some suspension bushing for not, see how it works.
The goal, make a crossmember that:
1. Didn’t use the skid plate for a mount
2. Would hold the extra weight of dual xfers and the extra leverage exerted on the trans trail housing.
3. More substantial than the rubber and two bolts. Last time pulled the skid, the trans bolts where laying on it, not good.

Like a flatter belly but don’t see it happening with the dual cases.

Things that happened:
The 231 has studs, this makes it so the crossmember can’t be pushed straight up into place. Solution, make a bracket that mounts to the trans and 231 that bolts-on separately, similar to a Th350/203 support bracket of yesteryear. This bolted to a forward offshoot. The back is attached using two of the 231 outer case bolt, which holds an aluminum plate the D300 bolts to now and seals the back half of the doubler, welded to a rearward offshoot of the crossmember.
After all that, the skid was modified 1,2....15 times until everything cleared. Thinking a Barnes skid maybe in the future.

Quick drive: Well. An definitely feel the low end not so smoothness of my engine but the drivetrain feels more “planted”, not moving as much. We’ll see what happen during the next wheelin’ trap.
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post #6 of 7 Old 07-28-2019, 10:42 AM
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Beautiful work! I love the idea of moving the mounts/isolators outward to bushings. I'd imagine that if you used rubber instead of silicone that you'd get a bit better dampening, but it's still a slick setup. Do you have any issues with the front shaft rubbing during articulation?

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post #7 of 7 Old 07-29-2019, 10:22 AM Thread Starter
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Quote:
Originally Posted by Mechman71 View Post
Beautiful work! I love the idea of moving the mounts/isolators outward to bushings. I'd imagine that if you used rubber instead of silicone that you'd get a bit better dampening, but it's still a slick setup. Do you have any issues with the front shaft rubbing during articulation?
Front shaft rub, don't know yet. I need to pull the skid plate off and see if everything survived Saturday.

As for the mounting, there are a number of rigs in the forum that run this setup so it's nothing new just new for my rig.

Yes, at this time I'm running different bushing for the trans and engine. I know this mismatch is a no no but it's what I had at the time to use. Though off-road, I didn't feel much vibration at low rpm like I do on the street. The rig also felt more "tight" or no drivetrain "wind-up" when climbing and when descending hill especially double low descents.

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