The only down side to the cable vs the older hydraulic clutch setup is that flimsy bracket the pedal pivots on. If the clutch gets stiff that bracket doesn't last long. I have redone the hydro clutch system (both slave and master cylinders) on my 77 five times but I never had an issue with my 79s with the cable, at least not since I rewelded the bracket.
Just wanted to point out, a hard to push in does not mean there is anything wrong with the clutch disc/pressure plate in 99.9% of cases. Concentrate on getting the cable lubed and it should help a lot. If you lube from the top and bottom several times over a few days of driving and it should trickle down into the cable. The return spring down by the transmission might be the wrong one too, a lighter spring down there could help.
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good
