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Old 01-22-2010, 08:13 AM   #1
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Manual Front Hubs

I was wondering if anyone that has installed manual locking hubs on a TJ 4.0l 5spd with the Dana 30 in the front noticed any difference in fuel economy? I was reading an article online that said by converting to a system that totally frees the front wheels from power can improve gas mileage. I really don't see it happening but am curious if some that have done the switch have found any savings in gass mileage?

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Old 01-22-2010, 10:50 AM   #2
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I don't have a Dana30 up front but I do have manual locking hubs in my Currie 9" up front and since I've got CTM u-joints I wouldn't necessarily want to run everything locked up at freeway speeds on a couple tanks just for testing. By keeping everything unlocked (hubs, driveline, etc.) there is also less wear and tear on those components, so even if you're only saving a few miles per TANK the less wear and tear should account for something.

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Old 01-22-2010, 10:57 AM   #3
Knows a couple things...

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I installed manual hubs onto my TJ and most of the guys I wheel with have them too but they won't help with fuel economy. The unit bearing hubs & the fact the transfer case disconnects the front driveshaft really means you're only turning the R&P gears inside and that just doesn't cause you to lose mpg.

If there was a significant gain to be had by going back to manual hubs like Jeep used to have on the old CJs, they would have done so to help improve the overall fleet mpg ratings as the feds are pushing them so hard to do.

So there are other reasons to spend over $1000 for a manual hub conversion kit but better mpg is not one of them.
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Old 01-23-2010, 04:25 AM   #4
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Thanks. I figured it was too good to be true. I think I remember awhile back there was another thread about this subject
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