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I know that my old 82 toyota truck bogged right down with the hubs locked, so i have a good idea as to how much additional drag there is from the extra moving parts. Why any manufacturer makes them this way is beyond me. I will update later with change in fuel economy.
Ya, but more crap to go wrong and leave you stuck somewhereWild
I installed manual lock outs on my 2001 Grand Vitara mainly because i did not like the cv shafts turning all the time. Even though the front end disengages the axles the hubs are still turning the cv shafts. I was also hoping for better milage but that didn't happen.
GV's are known for their leaky front diff seal on the right hand side. By putting manual hubs in it stops the rotation and the leak doesn't seem to occur. Of course if you already have a leak then you still need to change the seal as well. While you are there also consider adding in a bush that Suzuki makes to help with the seal problem even though the manual hubs will solve it as the bush provides support for the driveshaft which is no bad thing and may reduce its chance of failure offroad.http://www.suzuki-forums.com/1g-1999-2005-vitara-grand-vitara/29722-cv-joint-free-play-2.html
I wanted a set of those drive flanges for building a full floaterrear axle