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Put locking hubs on the front. Unlock them, put the T case in Hloc and drive.Everything still turns, front and rear diffs. Just not coupled to the front wheels. Takes the bind out of turning. If you put the kit in the Tcase you have to engage the Tcase to lubricate the rear bearing every 100 miles.Save your money for a Tcase and shafts, you'll need the locking hubs anyway.I've been running around for years with just locking hubs for years with no issues. Only sacrifices a little gas mileage.You'll get varying opinions on this one.
I believe that Hi and HiLoc on a 203 are the same ratio, so everything should turn the same speed
my 79 had lockouts installed before i bought it. i tried driving with them unlocked and the case in LOC. made no difference in fuel milage compared to locking them and running in High. others will probably disagree but thats to be expected. nothing wrong with the 203
The problem with full time transfer cases is that its harder on the front end components than a part time case.