NP231 doubler / crawlbox

SkylinesSuck said:
Is that a custom crossmember to make it fit?
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I do custom crossmembers on all the Atlas installs. That is the only way I can generally get them in place with the stock transmission mount to slow down the potential for annoying vibes at idle. I also use my "custom" belly skids. Custom in quotes since I do have the plates cut and bent up in small batches but I do have to fit each one to the frame holes for the bolts.
 
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mrblaine said:
I do custom crossmembers on all the Atlas installs. That is the only way I can generally get them in place with the stock transmission mount to slow down the potential for annoying vibes at idle. I also use my "custom" belly skids. Custom in quotes since I do have the plates cut and bent up in small batches but I do have to fit each one to the frame holes for the bolts.
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I wish I would have done a crossmember mount then found the correct skid for the height I could get out of it. Instead of hitting the easy button. Factory rubber mounts are a must for me too.
 
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Gollywomper said:
I wish I would have done a crossmember mount then found the correct skid for the height I could get out of it. Instead of hitting the easy button. Factory rubber mounts are a must for me too.
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I don't know why I don't take pics of the Atlas installs. Never think of it for some reason. They are all very similar though so that is likely why. You see one, you've pretty much seen them all, the problems that get solved are the same for each.

I will say I am very surprised by the top to bottom height of that flipped 300. I had no idea that was how big they are.
 
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That extended cover for the flip kit does not help to get it rotated flat. The atlas or aftermarket cases would be more rounded there. I have been studying the photos as well. My 300 is back about 5 inches too, not sure if that is causing some illusion as well.
 
Here is a stock case vs the MM case. The shifter block adds at least 1” to the height on the stock box making it a bit bulkier. Not sure on a comparison on an Atlas.

E437F683-297B-4112-B134-A5DA3D124914.jpeg
 
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mrblaine said:
I do custom crossmembers on all the Atlas installs. That is the only way I can generally get them in place with the stock transmission mount to slow down the potential for annoying vibes at idle. I also use my "custom" belly skids. Custom in quotes since I do have the plates cut and bent up in small batches but I do have to fit each one to the frame holes for the bolts.
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Completely answered my question, thanks 👍
 
Another dumb/simple question about D300's; how do they mount? Stock style mount and crossmember (which means I could run it with my Savvy TT?) or does it need custom fab work too?
 
SkylinesSuck said:
Another dumb/simple question about D300's; how do they mount? Stock style mount and crossmember (which means I could run it with my Savvy TT?) or does it need custom fab work too?
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Stock mounts. It would just bolt to the back of your transmission with the use of a clocking ring.
 
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Thanks a bunch. I'm still going to rebuild this spare 231 I have with a JB SS SYE and install it, but I'm going to start hunting for a D300 for a future project. The doubler appeals to me also, even as a possible replacement for the lowmax gears, but length might be an issue then with my TT.

All the interest in the 205 is for the slushbox guys I'm assuming? I really hope somebody on the board reports back with a MMW case installed and running in their TJ. Did the guy who posted earlier ever get his that was on super double secret backorder?

15b3505b193a4e8f952dbb44fc5fa048.jpg
 
SkylinesSuck said:
Thanks a bunch. I'm still going to rebuild this spare 231 I have with a JB SS SYE and install it, but I'm going to start hunting for a D300 for a future project. The doubler appeals to me also, even as a possible replacement for the lowmax gears, but length might be an issue then with my TT.

All the interest in the 205 is for the slushbox guys I'm assuming? I really hope somebody on the board reports back with a MMW case installed and running in their TJ. Did the guy who posted earlier ever get his that was on super double secret backorder?

View attachment 390261
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My rear drive line was 5/8” shorter with the doubler vs the sye 231. I believe the doubler was real close to 1” longer thank the 231. A 300 alone would save 5” of rear shaft room.
 
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One benefit about the 300 with or without the doubler is you can buy the parts and pieces over time which makes it easier, at least for me with my limited attention span.
 
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So slightly shorter then a SYE 231 but a couple inches longer than a SS SYE 231. Got it. I wonder if that would be enough for me.
 
Ohhhh, gotcha. No doubler with a TT then.

* Or with my Savvy TT and 3" lift I should specify. I'm on the hairy edge of vibes right now.
 
SkylinesSuck said:
Ohhhh, gotcha. No doubler with a TT then.

* Or with my Savvy TT and 3" lift I should specify. I'm on the hairy edge of vibes right now.
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Big reason why I didn’t push too hard on flattening my belly. Went with an aluminum skid with about 1” clearance from stock. I may get a slight vibe when the hard top is off, but hard to really tell at 65-70 with no doors or top. It is a game of compromising.
 
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Gollywomper said:
Big reason why I didn’t push too hard on flattening my belly. Went with an aluminum skid with about 1” clearance from stock. I may get a slight vibe when the hard top is off, but hard to really tell at 65-70 with no doors or top. It is a game of compromising.
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Running the stock TC skid now I have no vibes. Checking the Savvy site a few times a day for their skid. An aftermarket TC case and a tummy tuck not a good option?
 
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RINC said:
Running the stock TC skid now I have no vibes. Checking the Savvy site a few times a day for their skid. An aftermarket TC case and a tummy tuck not a good option?
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It is just something to keep in mind. A doubler case setup will add length to your drive train , shortening your rear drive shaft. A tummy tuck increases your rear shaft operating angle.
 
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These gears were in a Midnight Metal Works D300 case and the case survived. Owner said he was on the skinny pedal when the carrier bearing seized and it took out the intermediate gears. Comments that followed were surprise that the case didn't break. Most felt that if it'd been a stock case it'd have broken.

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