[urq] Diff lock mods?

[DGraber460 at aol.com]

Has anyone modified the URQ diff lock set up to be manual as opposed to  
vacuum operated?
On my late build 83 (now totaled) the locks worked but were quite slow, and  
had the ability to lock center only or both center & rear. My current early  
build 83 has an "on off" set-up linking both center and rear, and will engage  
them but not disengage them.
Over the weekend I had the car up off all 4s and used a vacuum pump to  
thoroughly test the system for leaks, and both the green (engage) and red  
(disengage) systems are leak free. The red system just doesn't have enough grunt  to 
pull the diffs off.
I would like to go to a manual system with levers and control cables but  
need to source some "custom" parts and cables, and was curious if anyone else  
has already done this.
I had recently thought my alignment was bad as the car would corner weird  on 
long sweepers and just handle a bit strange. it now appears my rear diff has  
been locked for some time. 
TIA.  
 
Dennis
Denver