transfer case swap

joshs87

Well-Known Member
Joined
Mar 22, 2008
Location
mt. holly ,nc
What all needs to be done to swap in a Dana 300 into a 2000 tj with a 5 speed? And also I am swapping in rubi axles I have a 6" fabtech crawler kit. Will the front driveshaft still have to be shortened even with the 6" lift? Thanks in advance for the help.
 
First thing you will have to do is flip kit for the D300 or a passenger drop front axle.
 
Do you know of anyone who makes a flipped shifter? I have heard about them but can't find any. It is also short enough that I can put a cv driveshaft and not have any driveline worries right?
 
I'm kind of curious as to why a 300? Are you planning on upgrading to a 31 spline output rear? 4:1 gears? All these things add up, not quite to a Monster 300 or an Atlas, but is it really worth the work? What are you planning on doing that a 321 or a rubi 241 case won't handle?

Driveshaft modifications are secondary to the t-case choice. Your cv shafts will work fine, but you will have to get them reworked for the proper length. That's the nature of the beast when changing cases.
 
There are two bolt holes in the transmission that need to be widened, and the transmission output shaft needs about 1/8-3/16" ground off the end so it doesn't bottom out in the t-case input. You will have to flip the case to make the front output line up with your front axle. You will have to do something about the shifters, be it a flip kit (Down East Offroad, etc), cable shifters, or a custom mechanical linkage that goes out the back. When flipping you also have to relocate the vent line and maybe the speedo gear. You will also need yokes for CV (dual cardan) driveshafts front and rear, and most D300's don't come with those.

The advantages are a 4" longer rear driveshaft, stouter case, ability to twin stick it, and much cheaper 4to1 kits. The disadvantages are an extra 40 pounds, having to cut holes in your tunnel and console for the shifters, and maybe some other things that I can't remember.
 
joshs87 said:
I would rather have a rubi case. Anybody know where I can get one for a decent price.
Click to expand...
I saw 2 on car-part.com in VA. I think they were about $1000. When you add up what it takes to do a 300 and the fact it's pretty much bolt-in, that cool grand doesn't look too bad.
 
you can build up your np231 very easo;y and quite cheap too. its what i did. or for super cheap you can get a np231dhd tcase.
 
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