Originally Posted by jdavidsmi
A thought accrue(as scary as that my be) to me to other day while repacking the wheel bearings on my tow Dolly.
I have a VW Jetta automatic (wife is disable and cannot drive a manual anymore) which we tow on the dolly.
Any way I was wondering why someone has not come up with locking/unlocking hubs for a FWD with an automatic transmission? that could be added on. I know there are many 4x4 vehicles with lockable front hubs, and i saw there is a company that makes drive shaft disconnects for trucks.
That way i could just unlock the hubs and flat the car without the PITA
on the dolly, and still be able to keep a car i really like.
I'm sure there must be a reason, stress?
sure would like to hear some thoughts.
Well, back a few decades ago when a bunch of us were towing "CJ" model jeeps, we knew about the potential damage to the particular transfer case that was used in those model jeeps when flat towing them. So, we all came up with this brilliant idea to install "Front axle" style locking/un locking hubs on the rear of our Jeeps so that, just like you're thinking, we could un-lock them and, along with the front hubs un-locked, we'd have no axles turning at all when flat towing.
But, it wasn't long before that idea was scrapped. The main reason was, all those Jeeps were daily drivers. And, even though the hubs installed on the rear were of good quality, "Warn" hubs, they would disintegrate after some street time use. They were not and, are not designed for the constant torque that is demanded of them in a constant, daily, pavement type environment.
Part time use in limited slippage, off road use, and in front axle drive conditions, they'll last considerably longer. But, it's PART TIME USE, not used as a daily driving system.
The mechanism involved in being able to select a "Free spooling" vs a total lockup for "Driving" is small and not all that strong. The stop and go, pavement, parking lots, turning on pavement, up and down hill torque while turning and may other drive type situations was just to taxing on even the best of those hubs. We destroyed them all.
So, designing one for your VW (or any other non-flat-towable car or truck) so that it is TOTALLY DEPENDABLE for thousands and thousands of pavement type driving miles, just for the convenience of "un-locking" them for flat towing, is just too cost prohibitive.