QUOTE
While reversing the front diff seems to bind up & puts a lot of strain on the transmission.
Are you in 4WD mode when you do this? If you are then take note that you shouldn't have 4WD engaged on hard surfaces. On a Terracan there is no way to take the binding out of the diff until you go onto dirt or a slippery surface. Your drivers manual should say this (only engage 4WD offroad). This is the same for any non fulltime 4WD with locked or permanently engaged hubs.
But, if your feeling adventurous !!! :wink2:
The Terracans have a system attached to the front axle called the Centre Axle Disconnect System (CADS for short).
The CAD System disconnects the front axle from the front differential when in 2WD, to minimise road noise. The hubs are permanently attached to the axle (No freewheeling hubs on a Terracan)
Now theoretically, it might be possible to modify this system to disconnect when in 4WD low with a separate switch setup (thereby achieving your objective, albiet with the front differential still being driven by the transfer case).
I'd be very careful with this, however, as the Terracan has extensive diagnostic systems that warn of a malfunction (Having the front axle disconnected while in 4WD low is most definately a malfunction). If you modified the CAD System to do this, the onboard engine management computer may not like it at all.
Also be aware, as I said above, the differential would still be driven by the transfer case and this cannot be easily avoided. Terracans have a fairly complex setup depending on your model. The 5 speed manual model uses planetary gears and an electrical motor actuator to shift into low. The automatic uses a multiple clutch setup that controls the rotation of both differentials as well as the afore mentioned elctrical motor. I definately wouldn't advise fiddling with either of these systems, as they're closely tied with the the ECM (Electronic Control Module) that runs the whole process of transfering to and from 4WD).
If you managed to successfully implement this modification, I wouldn't think you could get away with driving too fast either. I reckon you should treat it the same way as a diff locker. Slow and only for short distances when you really need it.
If you want to have a look at this system, to decide wether this is feasable, you can get the Terracan workshop manual from your hyundai dealer. It's a little expensive (around A$200), but well worth it, if you are planning such a major modification as this.
Hope that helps a little. :57:
NB: The part Number for the manual is AH1S-EG11A
This post has been edited by Horsewhisperer: May 18 2007, 08:13 AM
Using Low Range In 4 X 2, Low range in 4X2
Mar 24 2007, 01:45 AM
