Swaping Manual hubs for auto lockers
12-18-2007, 05:01 PM
#21
Registered User
unless he has a front locker, the diff. will NOT spin. 
on a normal open differential and ADD, when the sleeve lets go, the front differential will not spin. that's the whole point of it. otherwise it would be identical to manual locking hubs with the hubs locked all the time.
and i see a significant difference in gas mileage when my front hubs are locked, and when they're not. (not in 4wd)
to check the ADD thing, put an ADD truck on a lift, or even just jack up the front, with the transfer case in 2wd, spin one tire, then spin the other. you WILL NOT feel the differential spin. now put it in 4wd, and the tranny in neutral, and spin it. don't take my word for it, check it for yourself.
on a normal open differential and ADD, when the sleeve lets go, the front differential will not spin. that's the whole point of it. otherwise it would be identical to manual locking hubs with the hubs locked all the time.and i see a significant difference in gas mileage when my front hubs are locked, and when they're not. (not in 4wd)
to check the ADD thing, put an ADD truck on a lift, or even just jack up the front, with the transfer case in 2wd, spin one tire, then spin the other. you WILL NOT feel the differential spin. now put it in 4wd, and the tranny in neutral, and spin it. don't take my word for it, check it for yourself.
I get 400-450 kms (250-280 miles) per tank with my hubs locked. And I get .... 400-450 kms per tank with them unlocked. The biggest difference I've noticed is that I drop mileage with winter gas and cold temps.
Last edited by RobD; 12-18-2007 at 05:03 PM.
12-18-2007, 08:40 PM
#23
Registered User
^ ok, then the other descriptions that i read about how ADD worked were incorrect. 
though, i had it partially correct in my head. i knew the whole differential/driveshaft wasn't spinning, but i didn't realize that the spider gears still spun. thanks for correcting me, as i despise bad info!
though, i had it partially correct in my head. i knew the whole differential/driveshaft wasn't spinning, but i didn't realize that the spider gears still spun. thanks for correcting me, as i despise bad info!
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