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actually to adjust this if it is a 203 tcase, all oyu need is an 11/64 drill bit and a 1/2 inch wrench and the ability to put the tcase in neutral.78machowgn4me said:you might need to adjust your shift linkage. there should be two different shift rods, one for the range (hi or low) and one for the lockout (locked or unlocked). if the lockout or range levers are not properly adjusted, they will be to far at one end of the scale (in your case the low and low lock positions), and wont engage the hi or hi lock properly. i suggest taking it to a professional, because this can be a very tricky thing to adjust.
what you do is crawl under the truck, loosen two(2) 1/2 inch bolts/nuts holding linkage slides in position. you then manually shift the range and loc lever into neutral, once you have made sure tcase is in neutral, you can look on side of shift lever case, you will see a small (11/64) hole in the side of case. slide drill bit into hole making sure it goes all the way through and prevents movement of either shift lever. get inside of truck and make sure shift handle for tcase is in neutral position. (if drill bit went all the way through case, then it should be) if it is then climb under truck and tighten the two (2) 1/2 inch bolts on the linkage rods. about a 20 minute procedure
while under the truck make sure linkage rods are good and straight, if they arent this could throw your adjustment out of whack.
however, i agree with william on this, if it is a 77 it should be fulltime and have the 203 case, it should not have lockout hubs, unless someone put in a part time kit. please let us know on this