I have 2 2005 crd one is modified to use in winter ei cold weather starting and no ac
two summer truck with no drive shaft from transfer case and gets about 2 miles better gas mileage per gal. this was summer driving using both trucks about 760km per tank both have yeti stage 1 tune
I will just remove front drive shafts this summer see what happens If you have posi it will work very good in winter too
thanks for all the help to all who have put hrs upon hrs so I can have a great truck

You can't gain any mpg's by removing the front driveshaft your still turning the front Diff regardless with the driveshaft installed or not and 10lbs driveshaft can not gain you that kind of mileage.

You would have to remove the CV axles also to prevent the front diff from turning.

I don’t know, the difference between 2x4 and 4x4 pickups is pretty dramatic, especially on the highway. And at least with the Ford F-150 that includes disconnecting hubs.


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There will be difference between a 2wd vehicle and 4wd vehicle of the same make,about 300-1500lbs difference(depending on said vehicle).

Just removing a 10lbs item from a 4wd that does not have any type of front axle disconnects will not see any difference since your still spinning the front diff.

I would expect similar to this for improvement. The non-supercrew F150s weigh about the same as the CRD. The only difference here is the F150 has unlocking hubs so the whole front driveline is disconnected in 2wd. This give the jeep a little advantage.


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So it looks like between 5% and 10% improvement.
For people who drive a lot of highway miles and don't do much offroading, that's pretty significant. Not per tank necessarily, but over a year, it is. With the price of (edit) fuel going up, it's even greater savings.

(edit2) If you never use it, then you've bought something you don't need. Pull the parts while they're still in good shape. Put them on Ebay or Craigslist or other. Sell them for even more savings.

that 1 idiot that doesn't mind it not being 4wd.

Thx all for the insight.



A bit harsh but I understand.
I use my Jeep to pull a small trailer and we seldom see below freezing weather.
It is Dec and currently 41°F (5°C).

Thus making your KJ worthless when you plan on selling it,no dealer would ever take it on trade in without the missing parts re-installed and looking at a law suit selling private party unless you find that 1 idiot that doesn't mind it not being 4wd.

I drove my KJ for almost 2 years with the front diff(and all mounts),both CV axles,and front driveshaft removed and saw zero improvement in mpg's.That was after blowing a CV axle thus cementing the SFA swap,collecting parts for said swap.

It probably makes perfect sense for you if you're going to drive it until it's time to crush it, or if you keep the parts to reinstall them later. I thought doing the same and seeing what kind of mileage I could get out of one, and have it as a dedicated tow rig except winter. Stock old sagged springs ride really soft, and make for a nice lowering. Sounds like a Detroit locker would be really nice for you if you off road a bit