Hey guys,
I'm currently trying to trouble shoot an issue in a 93 RCC LWB, essentially it is "locked" into granny gear.

So I just recognized I wasn't clear on exactly how that unit functions.
It's permanent 4wd correct? and then when you get in trouble - you kick it into 4 low (granny gear) right? so that lever activates the center differential lock? so that eesentially locks between front and back? and then there is a rear diff lock as well? and that "locks_ the 2 rear wheels?

so does 4 low lock the rear differential? or does the rear diff automatically lock and unlock based on wheel sensors etc?

and if going to granny gear locks it up - is that mechanical? hydraulic? electronic - how does the message get to the rear diff, and how is it activated?

thanks

 

If you have a stock '93 RRC then it does not have a manual center dif lock like on the Discovery. (Lt230)

The RRC came factory with the Borg Warner transfer case. It is a permanent 4wd solution but the BW employs a viscous coupling as opposed to a manual lock. When wheel slip occurs, the BW "locks up" (except its not a true lock)

this system performs particularly well in slippery conditions on road.

All the hi/low Range lever does is change the gearing of the vehicle.

 

OK, thanks Robert, that helped alot,
Can I ask you one more question?
the high low range gear selector - where does the gear change occur? in the transfer case? I can't believe it would be the rear differential, so it has to be in the transfer case? and if so - electronic switches? cable activated? what exactly is doing the switching between the high and low options?

 

It switches gear sets in the transfer case through mechanical means.