Midnight Metalworks Rockbox D300

They do. It's a DIY case and you add all the parts yourself. If you look long enough you can find a used D300 for under $300.
Nice thing about this way is you can spread out the cost a bit. However one you add it up you begin to question if it’s worth it or to just buy the complete upgraded case

Rock box $1400
4-1 gears $750
Rebuild kit $150-$200
Donor case with internals $300-$500
New intermediate shaft $50
Add that up and the complete case with upgraded outputs starts to sound like a better deal.
 
  • Like
Reactions: Wildman
You can buy a stock Dana 300 and install a flip kit and gears could get the job done for about $1800-2000.
Could actually be done cheaper if you did your own flip job. I would recommend to use the DEO 300 flip kit. Nice kit that solves the leak issues when flipping a 300 and also solves the shifter and linkage issues.
 
Nice thing about this way is you can spread out the cost a bit. However one you add it up you begin to question if it’s worth it or to just buy the complete upgraded case

Rock box $1400
4-1 gears $750
Rebuild kit $150-$200
Donor case with internals $300-$500
New intermediate shaft $50
Add that up and the complete case with upgraded outputs starts to sound like a better deal.

If you are buying the 4:1 gears and a rebuild kit plus new intermediate shaft then why do you need to buy a old D300? Other than the outputs you have replaced everything else.
 
If you are buying the 4:1 gears and a rebuild kit plus new intermediate shaft then why do you need to buy a old D300? Other than the outputs you have replaced everything else.
I guess you could buy the remaining internals. Various washers and shift collars from Midnight. The above break down was showing that buying the case was a better option, if you were doing upgraded outputs, gears and the box you would be better off buying it complete.
For most TJs with stock powertrain the stock 300 outputs would be fine.
It’s a fine line between building a case and buying one.
 
  • Like
Reactions: Wildman and AMS417
I agree but , it won’t be a 4 to 1 ratio or twin stick for a multi tasking.

Boy, after running my 231 over these rocks there in my new avatar, I asked myself if a 4.0 to 1 ratio would give me more control. The Jeep wanted to jump forward with the 2.72 ratio.

BTW, this my first time in these type of rocks.
blackcanyon004.jpg
 
I guess you could buy the remaining internals. Various washers and shift collars from Midnight. The above break down was showing that buying the case was a better option, if you were doing upgraded outputs, gears and the box you would be better off buying it complete.
For most TJs with stock powertrain the stock 300 outputs would be fine.
It’s a fine line between building a case and buying one.

Yes I can agree with that one. It all comes down to what you're upgrading and how deep into it you want to go. And then at what point do you just say "F" it and spring for the complete case?

And as far as the D300 not being wide enough AA use to sell a kit (can't find it anymore) that had 2 pillow blocks for driveshafts to make a 2 or 3 piece driveshaft to move it around things. Here is a picture of something like that. So it isn't an insurmountable problem.

1642657225791.png
 
They do. It's a DIY case and you add all the parts yourself. If you look long enough you can find a used D300 for under $300.
So if the 300 is too small for our tj’s with automatic transmissions , and we want a 4:1 ratio transfer case the only options we have is the (rubicon 241OR). Or an atlas?? Is that right ? So what 4:1 transfer case would fit the best ??
 
Yes I can agree with that one. It all comes down to what you're upgrading and how deep into it you want to go. And then at what point do you just say "F" it and spring for the complete case?

And as far as the D300 not being wide enough AA use to sell a kit (can't find it anymore) that had 2 pillow blocks for driveshafts to make a 2 or 3 piece driveshaft to move it around things. Here is a picture of something like that. So it isn't an insurmountable problem.

View attachment 303858
Wow how bout that.
 
Man I want one of these. Of course I find out about these the day after I received my SS SYE. I'd like to actually hear from somebody who has one installed in a TJ first though.
 
Man I want one of these. Of course I find out about these the day after I received my SS SYE. I'd like to actually hear from somebody who has one installed in a TJ first though.
That might take some time. It’s pretty much brand new I believe.
 
Yeah, I know. Sounds great on paper right now but I want to wait until somebody finds out what's wrong with it before I drop the coin. I need me some 4:1 and a longer rear driveshaft in my life and this is the only practical option besides finding a 241 and bashing it in to place. Because tummy tuck.
 
  • Like
Reactions: Igoo65 and TRE3TOP
Yeah, I know. Sounds great on paper right now but I want to wait until somebody finds out what's wrong with it before I drop the coin. I need me some 4:1 and a longer rear driveshaft in my life and this is the only practical option besides finding a 241 and bashing it in to place. Because tummy tuck.
I’m definitely on the sidelines with a tub of popcorn myself
 
I almost went the 300 flip route last year when I was looking for tcase gearing. With the 300 you could add a black box in front and it's nearly the same length as 231 I believe.

I found a 241or locally for a good price and went that route.
 
Wow how bout that.
Don't get too happy. Add the cost of that to the cost of the D300 and a new higher angle front driveshaft and it makes no sense economically.

If you want a good idea of the problems you'll run into, droop out your front axle, disconnect the front driveshaft and see how much down travel you have left. Remember, the shorter the shaft, the less travel it has since it moves further the shorter it gets. And, if you do some research, they are not without issue.

1642685367919.png